CAPRYLIC CAPRIC ACID

WHAT IS CAPRYLIC CAPRIC ACID?

Caprylic Capric Acid, known as Kaprilik Kaprik Asit or C8-C10 Yağ Asidi in Turkish, is a commercial mixture of two linear saturated monocarboxylic medium-chain fatty acids: caprylic acid (octanoic acid, C8H16O2, CAS 124-07-2) and capric acid (decanoic acid, C10H20O2, CAS 334-48-5). Rather than being a single pure molecule, it is a defined binary oleochemical cut obtained during the fractional distillation of split coconut oil or palm kernel oil fatty acids after stripping off low-boiling C6 caproic acid and before separating C8 from C10.
In natural lauric oils such as coconut oil and palm kernel oil, C8 and C10 fatty acids occur together in a natural weight ratio of approximately 55:45 to 60:40 (C8:C10). Co-distilling these two medium-chain fractions overhead as a single C8-C10 cut avoids the energy-intensive C8/C10 splitter column while creating a liquid mixture with a eutectic freezing point (typically 0 to 10 °C) that is significantly lower than either pure Caprylic Acid (~16.5 °C) or pure Capric Acid (~31.5 °C).
Buyers must carefully distinguish Caprylic Capric Acid (the free, acidic carboxylic acid mixture, CAS 68937-75-7) from Caprylic/Capric Triglyceride (MCT Oil, CAS 73398-61-5 or 65381-09-1). Occasionally, non-technical descriptions loosely refer to Caprylic Capric Acid as an ester, but chemically Caprylic Capric Acid is an unesterified, corrosive free fatty acid mixture (Acid Value ~360 mg KOH/g) used as the raw material to manufacture neutral Caprylic/Capric Triglyceride (Acid Value <= 0.2 mg KOH/g).

Common Product and Chemical Names:
Caprylic Capric Acid
Caprylic/Capric Acid
Caprylic-Capric Acid
Fatty Acids, C8-10
C8-10 Fatty Acid
C8-C10 Fatty Acid
C810 Fatty Acid
Octanoic/Decanoic Acid

CAS NO, EC / EINECS NO AND INCI NAME

Product name: Caprylic Capric Acid
Chemical inventory name: Fatty acids, C8-10 (Reaction mass of octanoic acid and decanoic acid)
Turkish names: Kaprilik Kaprik Asit / C8-C10 Yağ Asidi
CAS No (Mixture / UVCB): 68937-75-7 (also covered under broader C6-12 fatty acids CAS 67762-36-1)
Component CAS Numbers: 124-07-2 (Caprylic / Octanoic Acid, C8) and 334-48-5 (Capric / Decanoic Acid, C10)
EC / EINECS No (Mixture): 273-086-2
Component EC Numbers: 204-677-5 (Octanoic Acid) and 206-376-4 (Decanoic Acid)
INCI Names: CAPRYLIC ACID and CAPRIC ACID (or labeled by component INCI names in cosmetic raw material documentation)
Food Additive Code: E570 (Fatty acids, EU) / 21 CFR 172.860 & 21 CFR 184.1025 (US FDA)
Molecular Formula: Mixture of C8H16O2 (CH3(CH2)6COOH) and C10H20O2 (CH3(CH2)8COOH)
Average Molecular Weight: Approx. 154 to 158 g/mol (depends on C8:C10 ratio; pure C8 is 144.21 g/mol and pure C10 is 172.26 g/mol)
Chemical Class: Saturated linear medium-chain monocarboxylic fatty acid blend (C8:0 + C10:0)
Physical Form: Clear, colorless to pale yellowish oily liquid at room temperature
Ionic Character: Weak monoprotic organic acid mixture (pKa ~4.89–4.90 at 25 °C)
Main Functions: Feedstock for MCT oil and cosmetic emollient esters, synthetic polyol ester lubricant monomer, amine-carboxylate corrosion inhibitor precursor, antimicrobial food-contact sanitizer active, agricultural contact herbicide, and soap/surfactant intermediate
Because Caprylic Capric Acid is a binary substance of variable composition, regulatory documents may reference either the mixture CAS No. 68937-75-7 (EC 273-086-2) or the two constituent identifiers CAS 124-07-2 and CAS 334-48-5. Buyers must ensure that CAS 68937-75-7 (free C8-C10 acid) is never confused with CAS 73398-61-5 (neutral Caprylic/Capric Triglyceride ester).

CHEMICAL STRUCTURE AND MOLECULAR PROPERTIES OF CAPRYLIC CAPRIC ACID

Caprylic Capric Acid consists of unbranched saturated aliphatic carboxylic acid chains of eight carbons (n-heptyl tail + -COOH) and ten carbons (n-nonyl tail + -COOH). Both components are fully saturated (C8:0 and C10:0) with zero carbon-carbon double bonds, providing exceptional resistance to free-radical autoxidation, rancidity, and high-temperature color degradation.
A key physical-chemical property of Caprylic Capric Acid is eutectic freezing-point depression. Pure Caprylic Acid crystallizes at ~16.5 degrees Celsius and pure Capric Acid crystallizes at ~31.5 degrees Celsius. When C8 and C10 molecules are mixed in commercial ratios of roughly 55:45 to 60:40, the differing chain lengths interfere with regular crystal lattice packing, depressing the solidification point (titer) of the blend to approximately 0 to 10 degrees Celsius. As a result, Caprylic Capric Acid remains a pumpable liquid in cool warehouse conditions where pure C8 or pure C10 would freeze solid.
In aqueous systems, both C8 and C10 acids share a dissociation constant (pKa) near 4.89–4.90. Below pH 4.0, both exist as uncharged lipophilic monomers (R-COOH) that partition rapidly into microbial membranes and plant cuticles. Above pH 7.0–8.5, neutralization with alkali hydroxides or alkanolamines converts them into water-soluble octanoate and decanoate anions (R-COO-) that provide rapid wetting, corrosion inhibition, and low-foam hydrotropic coupling.

PRODUCTION AND CHEMICAL ORIGIN OF CAPRYLIC CAPRIC ACID

Commercial Caprylic Capric Acid is manufactured almost exclusively from natural lauric vegetable oils—specifically coconut oil (Cocos nucifera) and palm kernel oil (Elaeis guineensis).
In the standard oleochemical process, crude or refined coconut or palm kernel oil is hydrolyzed (split) with countercurrent steam at 240 to 260 degrees Celsius and 45 to 60 bar to produce crude split fatty acids (C6 to C18) and sweetwater (aqueous glycerol). After drying, the crude fatty acids enter a vacuum fractional distillation train. The first topping column removes volatile C6 caproic acid and odor bodies overhead; the subsequent column distills the combined C8–C10 medium-chain fraction overhead as Caprylic Capric Acid, leaving C12–C18 fatty acids (lauric, myristic, palmitic, stearic, oleic) in the bottoms.
Producing Caprylic Capric Acid as a co-distilled C8–C10 cut eliminates the final high-reflux splitter distillation required to separate C8 from C10, offering an economical, renewable medium-chain fatty acid feedstock. Ataman Kimya supplies and distributes commercial grades of Caprylic Capric Acid from established oleochemical origins; buyers requiring specific coconut vs. palm kernel origin or RSPO Mass Balance / Segregated certification should specify these requirements during inquiry.

PHYSICAL AND CHEMICAL PROPERTIES OF CAPRYLIC CAPRIC ACID

The physical and chemical properties of Caprylic Capric Acid depend on the exact C8:C10 weight ratio of the commercial grade (typically 55:45 to 60:40 C8:C10).
General technical properties:
Physical appearance (at 20 °C): Clear, colorless to pale yellowish oily liquid
Odor: Mild, characteristic fatty, slightly sour odor
CAS No: 68937-75-7 (components: 124-07-2 and 334-48-5)
EC / EINECS No: 273-086-2 (components: 204-677-5 and 206-376-4)
Chemical character: Saturated C8–C10 linear monocarboxylic fatty acid blend
Average molecular weight: Approx. 154 to 158 g/mol
Solidification point / Titer: Typically 0 to 10 °C (depends on C8:C10 ratio; often 2 to 7 °C for 60:40 cuts)
Boiling range (at 1013 hPa): Approx. 237 to 270 °C
Density / Specific Gravity (at 20 °C): Approx. 0.895 to 0.908 g/cm3 (typical: 0.900 g/cm3)
Dynamic viscosity (at 20 °C): Approx. 7 to 10 mPa·s (cP)
Refractive index (nD20): Approx. 1.428 to 1.434
Flash point (Closed Cup): Approx. 115 to 135 °C
Water solubility (at 20 °C): Sparingly soluble (~0.2 to 0.5 g/L depending on C8:C10 ratio); soluble in alkaline aqueous solutions
Organic solubility: Freely miscible with alcohols, glycols, ethers, esters, and hydrocarbon oils
Dissociation constant (pKa at 25 °C): Approx. 4.89
Acid Value (AV): Typically 354 to 370 mg KOH/g (often 358–366 mg KOH/g for 58:42 / 60:40 blends)
Saponification Value (SV): Typically 355 to 372 mg KOH/g
Iodine Value (Wijs): Typically <= 0.5 to <= 1.0 g I2/100 g
Color (APHA / Hazen or Lovibond 5.25"): Typically <= 30 to <= 60 APHA (or Lovibond <= 3.0Y/0.3R to <= 6.0Y/0.6R)
Moisture (Karl Fischer): Typically <= 0.10% to <= 0.20% w/w
Unsaponifiable matter: Typically <= 0.2% w/w
Typical GC Fatty Acid Composition: C6 (Caproic acid) <= 0.5%–1.0%; C8 (Caprylic acid) 50%–65% (typically 55%–62%); C10 (Capric acid) 35%–48% (typically 38%–44%); C12 (Lauric acid) <= 1.0%–1.5%

WHY EACH IMPORTANT PROPERTY MATTERS IN PRACTICE

Technical buyers, synthesis engineers, and formulators monitor specific parameters on a Caprylic Capric Acid COA for direct operational reasons:
- Gas Chromatographic C8:C10 Ratio: Controls average molecular weight, solidification temperature, ester viscosity, and water solubility. A higher C8 ratio (e.g., 60:40) increases Acid Value, lowers ester viscosity, and improves hard-water tolerance; a higher C10 ratio (e.g., 50:50) increases hydrophobicity and raises the solidification point.
- Acid Value (AV): Because pure C8 has an AV of 389.0 mg KOH/g and pure C10 has an AV of 325.7 mg KOH/g, the batch Acid Value (typically ~360–365 mg KOH/g) directly reflects the C8:C10 balance and determines the exact stoichiometric charge of glycerol, polyols, or alkali/amines needed in production.
- Saponification Value (SV): Should closely match the Acid Value (within ~1–2 mg KOH/g) to confirm absence of unsplit neutral triglycerides or methyl esters that cause cloudiness in aqueous soaps and sanitizers.
- Iodine Value (IV) and Color: Low Iodine Value (<= 0.5–1.0 g I2/100 g) and low APHA/Lovibond color confirm complete saturation and absence of thermal or iron discoloration, ensuring water-white MCT oils, cosmetic emollients, and synthetic lubricants.
- Titer / Solidification Point (0 to 10 °C): Allows liquid storage and pumping in cool indoor warehouses (10 to 15 °C) where pure Caprylic Acid (16.5 °C) or pure Capric Acid (31.5 °C) would solidify.
- C6 Caproic and C12 Lauric Impurity Limits: Keeping C6 below 0.5% prevents sharp goat-like malodor and low flash points; keeping C12 below 1.0% prevents foaming and hard-water soap precipitation.

HOW DOES CAPRYLIC CAPRIC ACID WORK AT THE MOLECULAR LEVEL?

Caprylic Capric Acid combines the complementary molecular behaviors of eight-carbon and ten-carbon saturated fatty acids:
- Synergistic Esterification to Medium-Chain Esters: Reacting the mixed C8 and C10 carboxyl groups with glycerol or hindered polyols (TMP, PE, NPG) produces mixed octanoate/decanoate triesters and polyol esters. Random distribution of C8 and C10 chains on the alcohol backbone suppresses ester crystallization, yielding liquid MCT oils and synthetic lubricants with very low pour points and low viscosity.
- Dual-Chain Membrane Disruption in Antimicrobials and Herbicides: In acidic media (pH < 4.0), uncharged C8 and C10 monomers partition together into bacterial membranes, yeast envelopes, and plant cuticles. The more water-soluble C8 acid provides rapid transport across the aqueous boundary layer and Gram-negative outer membranes, while the more lipophilic C10 acid anchors deeply into the hydrophobic lipid core, causing synergistic membrane leakage and intracellular acidification.
- Mixed Amine-Carboxylate Passivation on Metal Surfaces: When neutralized with alkanolamines (MEA, TEA, DGA, AMP) in metalworking coolants (pH 8.5–9.8), octanoate and decanoate anions chemisorb onto ferrous metal oxide sites into a mixed-chain hydrophobic monolayer that blocks oxygen and corrosive ions with low foaming.
- Low-Foam Hydrotropic Wetting and Soap Formation: Alkali salts (sodium, potassium, or amine caprylate/caprate) lower dynamic surface tension and wet hydrophobic surfaces rapidly without stabilizing persistent macro-foam.

WHAT PROBLEMS CAN CAPRYLIC CAPRIC ACID HELP SOLVE?

Caprylic Capric Acid resolves several practical formulation, handling, and cost-in-use challenges across industrial and regulated manufacturing.

Solidification and heating costs of single-cut C8 and C10 acids
Pure Capric Acid (C10) is a solid below 31.5 °C and pure Caprylic Acid (C8) freezes below 16.5 °C, requiring heated storage rooms or steam tracing in cool climates. Because Caprylic Capric Acid is a eutectic mixture with a titer near 0 to 10 °C, it remains a pumpable liquid at standard warehouse temperatures down to ~10 °C.

High raw-material cost of single-cut 99% C8 or C10 fractions in mixed-ester production
Many large-volume esters—most notably standard Caprylic/Capric Triglyceride (MCT oil), Propylene Glycol Dicaprylate/Dicaprate, and Coco-Caprylate/Caprate—naturally require both C8 and C10 acyl chains. Using co-distilled Caprylic Capric Acid avoids paying for the energy-intensive distillation split between C8 and C10 only to re-blend them later.

Oxidative rancidity and yellowing of unsaturated fatty acids
Replacing oleic acid or tall oil fatty acids with fully saturated Caprylic Capric Acid eliminates double-bond autoxidation, preventing rancid odors, peroxide buildup, and dark varnish deposits in lubricants, metalworking fluids, and cosmetics.

High foaming in CIP sanitizers and high-pressure coolants
Acidified Caprylic Capric Acid sanitizers and amine-neutralized C8-C10 metalworking corrosion inhibitors operate with minimal foam under high-pressure spray and recirculation shear where quaternary ammonium compounds or C12–C18 soaps foam excessively.

Persistent soil residues in agricultural weed burndown
Emulsifiable concentrates based on Caprylic Capric Acid rapidly desiccate weed foliage by disrupting waxy cuticles and cell membranes, then biodegrade rapidly in soil without leaving persistent herbicide residues.

BENEFITS FOR THE MANUFACTURER AND END USER

Benefits for the manufacturer, formulator, and process engineer include:
- Extended liquid handling window (solidification point typically 0–10 °C), reducing winter drum-thawing time and energy compared to pure C8 or C10
- Economical medium-chain carboxyl source (Acid Value ~354–370 mg KOH/g) for mixed C8/C10 ester and soap manufacturing
- Complete freedom from olefinic unsaturation, enabling high-temperature esterification (>200 °C) without charring or yellowing
- Low liquid viscosity (~7–10 mPa·s at 20 °C) for accurate metering and rapid mixing
- Synergistic C8 + C10 antimicrobial, wetting, and corrosion-inhibiting efficiency
Benefits for the final product and end user include:
- Colorless, odor-stable, oxidation-resistant MCT oils, cosmetic emollients, and synthetic polyol ester lubricants
- Low pour points and reliable cold-temperature fluidity in mixed C8/C10 ester base stocks
- Residue-free, non-foaming sanitization on food and beverage processing equipment
- Effective inter-operational ferrous rust protection in machining coolants

APPLICATIONS OF CAPRYLIC CAPRIC ACID

Caprylic Capric Acid is used across ester synthesis, industrial fluids, institutional hygiene, personal care, food, and agriculture.

Medium-chain triglyceride (MCT oil) and cosmetic emollient synthesis
In oleochemical ester plants, Caprylic Capric Acid is reacted with glycerol, propylene glycol, or fatty alcohols to produce Caprylic/Capric Triglyceride (MCT oil), Propylene Glycol Dicaprylate/Dicaprate, and Coco-Caprylate/Caprate. The mixed C8 and C10 chains keep the resulting triesters and diesters crystal-clear liquids even at refrigerator temperatures while delivering rapid skin spreading and oxidative stability.

Synthetic polyol ester (POE) lubricants and functional fluids
In synthetic lubricant production, Caprylic Capric Acid is esterified with neopentyl glycol (NPG), trimethylolpropane (TMP), or pentaerythritol (PE) to produce low-viscosity, low-pour-point polyol esters for HFC/HFO refrigeration compressors, aviation turbines, and biodegradable hydraulic oils.

Water-miscible metalworking fluids and corrosion inhibitors
In synthetic and semi-synthetic cutting and grinding coolants, Caprylic Capric Acid is neutralized with alkanolamines (MEA, TEA, DGA, AMP) to form mixed octanoate/decanoate corrosion inhibitors that protect cast iron and steel from flash rust with low foam.

Low-foam food-contact surface sanitizers and disinfectants
In dairy, brewery, beverage, and food-processing plants, Caprylic Capric Acid is formulated into acidic clean-in-place (CIP) sanitizing concentrates and peroxyacid mixtures to provide broad-spectrum bactericidal and fungicidal action without foam or persistent residues.

Agricultural contact herbicides and crop protection
In agriculture, Caprylic Capric Acid is formulated as an emulsifiable concentrate or potassium/ammonium soap for non-selective contact weed burndown, sucker control, and moss/algae removal.

Alkyd resins, PVC heat stabilizers, perfumery and dye intermediates
In coatings, polymers, and specialty chemicals, Caprylic Capric Acid serves as a non-yellowing short-oil baking alkyd modifier, a precursor to liquid Ca/Zn and Ba/Zn PVC heat stabilizers, a raw material for fruity/floral aroma esters in perfumery, and a dispersing/solubilizing intermediate in dye manufacturing.

WHICH INDUSTRIES USE CAPRYLIC CAPRIC ACID?

Caprylic Capric Acid is utilized across a wide range of industries depending on its C8:C10 ratio and quality grade:
- Cosmetics, personal care, and emollient ester manufacturing
- Nutritional lipid and Medium-Chain Triglyceride (MCT oil) production
- Synthetic lubricants, refrigeration compressor oils, and functional fluids
- Metalworking fluids, industrial coolants, and rust preventives
- Dairy, brewery, beverage, and institutional CIP sanitizers
- Food processing aids and aroma/flavor ester synthesis
- Agriculture, crop protection, and non-selective contact herbicides
- Paints, coatings, printing inks, and non-yellowing alkyd resins
- Plastics, PVC heat stabilizers, and rubber processing aids
- Perfumery, fragrance esters, and dye manufacturing
- Mining and non-sulfide mineral froth flotation

USE OF CAPRYLIC CAPRIC ACID IN COSMETICS AND PERSONAL CARE

In the cosmetics and personal care sector, Caprylic Capric Acid is primarily the oleochemical parent acid used to manufacture the industry's most widely used lightweight emollients and emulsifiers, and is also used directly in soap and cleanser bases.
Main cosmetic applications include:
- Synthesizing Caprylic/Capric Triglyceride, Propylene Glycol Dicaprylate/Dicaprate, Coco-Caprylate/Caprate, and Caprylic/Capric/Succinic Triglyceride for facial creams, sunscreens, foundations, lipsticks, and bath oils
- Producing multifunctional skin-conditioning and antimicrobial partial esters such as Glyceryl Caprylate/Caprate and PEG-8 Caprylic/Capric Glycerides (used in micellar waters)
- Reacting with alkali or alkanolamines in liquid soaps, shaving creams, and facial cleansers to boost quick-breaking lather and skin wetting
- Adjusting pH and solubilizing lipophilic actives and UV filters
For cosmetic use, buyers should verify vegetable origin (coconut or RSPO palm kernel), low C6 caproic acid content (<= 0.5%) to ensure a clean, neutral odor profile, water-white APHA color (<= 30), and compliance with heavy-metal and cosmetic regulatory standards.

USE OF CAPRYLIC CAPRIC ACID IN FOOD AND NUTRITIONAL APPLICATIONS

When supplied in a verified Food Grade / FCC / EU E570 compliant grade, Caprylic Capric Acid is a foundational raw material for nutritional lipids and food-processing applications.
Key food-sector roles include:
- Manufacturing standard nutritional Caprylic/Capric Triglyceride (C8/C10 MCT oil) used in clinical nutrition, medical foods, ketogenic supplements, sports nutrition, infant formulas, and food-grade pan-release oils and clouding agents
- Acting as a regulated food-processing aid, defoamer component, and surface coating adjuvant under E570 (Fatty acids) and 21 CFR 172.860
- Synthesizing mixed octanoate/decanoate food flavor esters
- Formulating no-rinse food-contact surface sanitizing solutions (under 21 CFR 178.1010 and 40 CFR 180.940) for sanitizing food-handling equipment
Food-grade buyers must verify Food Grade / E570 / FCC compliance, COA, SDS, heavy metal limits, unsaponifiable matter, residue on ignition, and Kosher, Halal, Non-GMO, and allergen-free documentation.

INDUSTRIAL, LUBRICANT, METALWORKING AND SANITIZER APPLICATIONS OF CAPRYLIC CAPRIC ACID

In industrial chemical manufacturing, Caprylic Capric Acid provides an economical, low-freezing saturated medium-chain acid for large-scale synthesis and formulation.
Key industrial uses include:
- Polyol Ester (POE) Lubricants: Esterification with NPG, TMP, and pentaerythritol yields thermo-oxidatively stable lubricant base stocks with low pour points and high miscibility with HFC/HFO refrigerants.
- Metalworking Fluids: Neutralization with MEA, TEA, or AMP produces water-soluble amine caprylate/caprate corrosion inhibitors that protect ferrous alloys against flash rust.
- Acidic CIP Sanitizers: Formulated with phosphoric, lactic, or citric acid, glycols, and sulfonate hydrotropes to sanitize stainless steel tanks and pipelines without foam.
- Alkyd Resins and PVC Stabilizers: Used as a saturated chain stopper in non-yellowing baking enamels and reacted with calcium, barium, and zinc oxides to form liquid PVC heat stabilizers.
- Perfumery and Dye Manufacture: Used to synthesize aroma esters for fragrances and as a dispersing and ester-forming intermediate in dye production.

FORMULATION AND PROCESS CONSIDERATIONS WHEN USING CAPRYLIC CAPRIC ACID

Important technical considerations when processing Caprylic Capric Acid include:
- Calculating Stoichiometry from Batch COA Acid Value: Because the C8:C10 ratio can vary slightly between batches (e.g., 56:44 vs. 60:40), the Acid Value varies between ~354 and 370 mg KOH/g. Always calculate polyol, glycerol, or alkali charge weights from the actual batch COA Acid Value rather than a fixed nominal molecular weight.
- Cold-Weather Conditioning: Although Caprylic Capric Acid has a low eutectic solidification point (0 to 10 °C), containers exposed to sub-zero winter transit can partially crystallize (with higher-melting C10 crystals settling to the bottom). If any crystallization or cloudiness is present, warm the entire container gently (20–35 °C, max 50 °C) and mix thoroughly before drawing aliquots so the C8:C10 ratio remains uniform.
- Managing Hard-Water Sensitivity of the C10 Fraction: Because Caprylic Capric Acid contains ~40% C10 capric acid (whose calcium salt is less soluble than calcium caprylate), aqueous metalworking coolants or CIP sanitizer dilutions used in very hard water (>300–400 ppm CaCO3) require sufficient surfactant hydrotrope or chelating agent (GLDA, MGDA, EDTA) to prevent calcium caprate haze.
- Controlling pH for Target Function: Keep pH below 3.5–4.0 in acidic sanitizers and contact herbicides to maintain uncharged membrane-permeating acid monomers; keep pH above 8.0–8.5 in metalworking coolants and soaps to maintain complete carboxylate solubility.
- Materials of Construction: Neat Caprylic Capric Acid corrodes carbon steel, cast iron, copper, brass, and zinc, causing iron/copper discoloration. Store and handle in AISI 316L (or 304) stainless steel, HDPE, polypropylene, and PTFE or FFKM gaskets.

TYPICAL USE LEVELS AND INITIAL FORMULATION APPROACHES FOR CAPRYLIC CAPRIC ACID

Typical starting use levels depend on the application and require laboratory validation:
- MCT oil and polyol ester synthesis: 68% to 88% w/w of total reactor charge (1.02–1.15 carboxyl equivalents per hydroxyl equivalent)
- Acidic CIP food-contact sanitizer concentrates: 1.0% to 8.0% w/w in concentrate (diluted to 100–400 ppm active fatty acid at pH < 3.5)
- Semi-synthetic and synthetic metalworking fluid concentrates: 1.5% to 5.0% w/w neutralized with alkanolamines
- Agricultural contact herbicide concentrates: 20% to 60% w/w in emulsifiable or potassium-soap concentrates

COMPATIBILITY AND INCOMPATIBILITY OF CAPRYLIC CAPRIC ACID

Caprylic Capric Acid is compatible with anionic surfactants (sulfonates, sulfates, phosphate esters), amphoteric surfactants (betaines, amine oxides), and organic solvents, alcohols, glycols, esters, and hydrocarbon oils.
In acidic sanitizers, high levels of ethoxylated nonionic surfactants can trap uncharged C8 and C10 acids inside micelles and reduce biocidal activity unless microbiological efficacy is verified. Above pH 5.5, deprotonated caprylate/caprate anions are incompatible with cationic quaternary ammonium surfactants and polyvalent metal salts (Ca2+, Mg2+, Fe3+, Zn2+, Al3+), forming insoluble precipitates unless chelated.
Caprylic Capric Acid reacts exothermically with concentrated alkalis (NaOH, KOH, neat amines), is incompatible with strong oxidizers, corrodes carbon steel, copper, brass, and zinc, and swells natural rubber, SBR, neoprene, polyurethane, and flexible PVC. Use 316L stainless steel, HDPE, PTFE, or FFKM equipment.

CAPRYLIC CAPRIC ACID AND PURE CAPRYLIC ACID (OCTANOIC ACID, C8)

Pure Caprylic Acid (CAS 124-07-2, >= 98%–99% C8) is a single-chain eight-carbon acid with a higher Acid Value (~389 mg KOH/g), higher water solubility (0.68 g/L), and a higher freezing point (~16.5 °C) than Caprylic Capric Acid (AV ~360 mg KOH/g, freezing point 0–10 °C).
Caprylic Capric Acid is more economical and stays liquid at cooler temperatures for mixed MCT oil and general ester production. However, pure Caprylic Acid is mandatory when C10 capric acid cannot be tolerated—such as in biopharmaceutical plasma IgG fractionation, pure C8 ketogenic tricaprylin synthesis, single-component ethyl octanoate flavor esters, or very hard-water coolants where C10 precipitates calcium caprate.

CAPRYLIC CAPRIC ACID AND PURE CAPRIC ACID (DECANOIC ACID, C10)

Pure Capric Acid (CAS 334-48-5, >= 98%–99% C10) is a waxy white solid at room temperature (melting point ~31.5 °C) with a lower Acid Value (325.7 mg KOH/g). Caprylic Capric Acid eliminates the need to melt solid C10 drums while providing a liquid C8+C10 blend for esterification and sanitization.

CAPRYLIC CAPRIC ACID AND LAURIC ACID (DODECANOIC ACID, C12)

Lauric Acid (CAS 143-07-7, C12) is a solid powder or flake (melting point ~44 °C, Acid Value 280.1 mg KOH/g) that produces high-foaming soaps. It cannot replace liquid, non-foaming Caprylic Capric Acid in CIP sanitizers, low-foam machining coolants, or low-viscosity MCT and polyol esters.

CAPRYLIC CAPRIC ACID AND PELARGONIC ACID (NONANOIC ACID, C9)

Pelargonic Acid (CAS 112-05-0, C9, MW 158.24 g/mol, melting point ~12.5 °C, Acid Value 354.6 mg KOH/g) has an average molecular weight and Acid Value very close to a 55:45 Caprylic Capric Acid blend (~156 g/mol, AV ~360 mg KOH/g), and both compete in herbicides, polyol esters, and metalworking fluids. Caprylic Capric Acid is derived from natural even-carbon coconut/palm kernel lipids and is approved for producing natural C8/C10 MCT oils and cosmetic emollients where odd-carbon C9 acid is not used.

CAPRYLIC CAPRIC ACID AND CAPRYLIC/CAPRIC TRIGLYCERIDE (MCT OIL)

Caprylic/Capric Triglyceride (MCT Oil, CAS 73398-61-5) is the neutral, non-corrosive glycerin triester manufactured by esterifying Caprylic Capric Acid with glycerol. Free Caprylic Capric Acid (CAS 68937-75-7) is a corrosive acid (Acid Value ~360 mg KOH/g) and must never be used as a direct substitute for neutral MCT Oil (Acid Value <= 0.2 mg KOH/g) in finished consumer products.

QUALITY GRADES, QUALITY CONTROL AND PURCHASING CRITERIA FOR CAPRYLIC CAPRIC ACID

Caprylic Capric Acid is supplied in Technical/Industrial Grade, Distilled/Refined Cosmetic Grade (low C6 odor, water-white APHA color), Food Grade (FCC / E570 compliant for MCT oil and food processing), and Biocide/Sanitizer Grade.
Parameters to review during incoming QC and before purchasing:
- Product name, manufacturer, and botanical origin (coconut oil vs. palm kernel oil)
- CAS No. 68937-75-7 and EC No. 273-086-2 (plus component CAS 124-07-2 / 334-48-5)
- Capillary GC chain distribution: exact C8 % (e.g., 55%–62%) and C10 % (e.g., 38%–45%), plus maximum C6 (<= 0.5%–1.0%) and C12 (<= 1.0%–1.5%)
- Acid Value (typically 354–370 mg KOH/g) and Saponification Value (355–372 mg KOH/g)
- Iodine Value (<= 0.5 or <= 1.0 g I2/100 g)
- Color (APHA / Hazen or Lovibond 5.25")
- Moisture by Karl Fischer (<= 0.10%–0.20%) and Titer / Solidification point (0–10 °C)
- Technical Data Sheet (TDS), Safety Data Sheet (SDS), and batch Certificate of Analysis (COA)
- Regulatory and sustainability certificates (E570/Food Grade, Kosher, Halal, Non-GMO, BSE/TSE-free, RSPO Mass Balance or Segregated, REACH)

STORAGE AND HANDLING OF CAPRYLIC CAPRIC ACID

Store Caprylic Capric Acid in tightly closed original HDPE drums, IBC totes, or 316L stainless steel bulk tanks in a dry, well-ventilated indoor area at 15 to 30 degrees Celsius away from direct sunlight.
Although its eutectic solidification point (0 to 10 °C) is much lower than pure C8 or C10 acids, exposure to freezing winter temperatures can cause partial crystallization of the C10 fraction. Any container showing crystals or turbidity must be warmed gently (20–35 °C, max 50 °C) until completely clear and mixed thoroughly before use to restore the original C8:C10 ratio.

SAFETY INFORMATION, PACKAGING AND LOGISTICS FOR CAPRYLIC CAPRIC ACID

Undiluted Caprylic Capric Acid is a concentrated organic acid mixture classified under GHS / CLP as causing severe skin burns and serious eye damage (Skin Corr. 1C, H314; Eye Dam. 1, H318) and harmful to aquatic life with long-lasting effects (Aquatic Chronic 3, H412).
Handle with local exhaust ventilation, chemical splash goggles, a full face shield, acid-resistant nitrile or butyl rubber gloves, and protective clothing. In case of skin or eye contact, flush immediately with plenty of running water for at least 15 minutes and remove contaminated clothing; if ingested, rinse mouth, do not induce vomiting, and seek immediate medical care. Refer to the current supplier SDS.
Standard packaging includes ~180–200 kg HDPE or lined steel drums, ~850–950 kg IBC totes, and heated 316L stainless steel ISO tank containers. Transport is regulated under Class 8 Corrosive Substances (UN 3265, Corrosive liquid, acidic, organic, n.o.s. (Octanoic/decanoic acid), Packing Group III).

WHAT SHOULD BE CONSIDERED WHEN PURCHASING CAPRYLIC CAPRIC ACID?

When sourcing Caprylic Capric Acid, defining the required C8:C10 ratio and target application in the Request for Quotation (RFQ) ensures batch-to-batch consistency.
Key details to clarify before purchase:
- Target industry and end-use application (MCT oil esterification, cosmetic emollient, POE lubricant, MWF corrosion inhibitor, CIP sanitizer, or herbicide)
- Required GC C8:C10 ratio (e.g., 60:40 vs. 55:45) and maximum C6 / C12 impurity limits
- Required Acid Value range, Iodine Value limit, APHA/Lovibond color limit, and moisture limit
- Feedstock origin and certifications (100% coconut vs. palm kernel, RSPO, Kosher, Halal, Food Grade / E570)
- Packaging format (drums, IBCs, or bulk ISO tank), order quantity, and delivery destination
- Required TDS, SDS, COA, and compliance declarations
Commercial pricing is driven by coconut and palm kernel oil market conditions, C8:C10 distillation tolerances, certification requirements (RSPO, Food Grade), packaging format, order volume, and Class 8 freight logistics.

CAPRYLIC CAPRIC ACID SUPPLY FROM ATAMAN KİMYA

Caprylic Capric Acid (C8-C10 Fatty Acid, CAS No. 68937-75-7, EC No. 273-086-2) is supplied for MCT oil and emollient ester production, synthetic polyol ester lubricants, metalworking coolants, low-foam food-contact sanitizers, agricultural herbicides, alkyd resins, and specialty chemical manufacturing.
Companies planning to purchase Caprylic Capric Acid from Ataman Kimya can share their application and specification requirements to confirm product suitability, current stock availability, origin, packaging options, and quotation details.
Sharing the following information in a quotation request facilitates evaluation:
- Application sector and intended final use
- Requested C8:C10 ratio and GC chain-distribution limits
- Required Acid Value, Iodine Value, color, and moisture specifications
- Required quality grade and certifications (Food/E570, Cosmetic, RSPO, Kosher, Halal)
- Estimated order quantity and preferred packaging type (drums, IBCs, or bulk)
- Required technical documents (TDS, SDS, COA) and existing product TDS/COA if evaluating a replacement

FREQUENTLY ASKED QUESTIONS ABOUT CAPRYLIC CAPRIC ACID

What is Caprylic Capric Acid?
Caprylic Capric Acid (also known as Caprylic/Capric Acid or Fatty acids, C8-10, CAS No. 68937-75-7) is a commercial mixture of linear saturated eight-carbon caprylic acid (octanoic acid, C8H16O2) and ten-carbon capric acid (decanoic acid, C10H20O2) fractionally distilled from coconut oil or palm kernel oil.

What is the CAS number and EC number of Caprylic Capric Acid?
The mixture CAS number for Fatty acids, C8-10 is 68937-75-7 and its EC / EINECS number is 273-086-2. Its two individual components are Caprylic Acid (CAS 124-07-2, EC 204-677-5) and Capric Acid (CAS 334-48-5, EC 206-376-4).

What is the typical C8 to C10 ratio in Caprylic Capric Acid?
Commercial grades most commonly contain 55% to 62% C8 Caprylic Acid and 38% to 45% C10 Capric Acid (often referred to as 60/40 or 55/45 C8/C10 blends), with <= 0.5%–1.0% C6 caproic acid and <= 1.0%–1.5% C12 lauric acid.

Is Caprylic Capric Acid the same as Caprylic/Capric Triglyceride (MCT Oil)?
No. Caprylic Capric Acid (CAS 68937-75-7) is a corrosive mixture of free, unesterified carboxylic acids (Acid Value ~354–370 mg KOH/g). Caprylic/Capric Triglyceride (MCT Oil, CAS 73398-61-5) is the neutral, non-irritating glycerin triester (Acid Value <= 0.2 mg KOH/g) manufactured by reacting Caprylic Capric Acid with glycerol.

Why does Caprylic Capric Acid have a lower freezing point than pure Caprylic Acid or pure Capric Acid?
Pure Caprylic Acid freezes at ~16.5 °C and pure Capric Acid freezes at ~31.5 °C, but mixing the C8 and C10 chains disrupts crystal lattice packing (eutectic depression), lowering the solidification point (titer) of Caprylic Capric Acid to approximately 0 to 10 °C.

What is the Acid Value of Caprylic Capric Acid?
Commercial Caprylic Capric Acid typically has an Acid Value of 354 to 370 mg KOH/g (most commonly 358 to 365 mg KOH/g), which sits between the theoretical Acid Value of pure C8 (389.0 mg KOH/g) and pure C10 (325.7 mg KOH/g).

What is the Iodine Value of Caprylic Capric Acid?
Because both C8:0 and C10:0 fatty acids are fully saturated with zero double bonds, the theoretical Iodine Value is 0.0 g I2/100 g, and commercial specifications typically guarantee <= 0.5 or <= 1.0 g I2/100 g.

Is Caprylic Capric Acid soluble in water?
In its acidic protonated form, Caprylic Capric Acid is only sparingly soluble in water (~0.2 to 0.5 g/L at 20 °C). It is freely miscible with alcohols, glycols, esters, and oils, and dissolves in alkaline water (pH > 7.5) by forming octanoate and decanoate soap salts.

What is Caprylic Capric Acid used for?
It is used to manufacture Medium-Chain Triglycerides (MCT oil), cosmetic emollient esters, synthetic polyol ester (POE) lubricants, amine-carboxylate metalworking corrosion inhibitors, low-foam acidic food-contact CIP sanitizers, agricultural contact herbicides, non-yellowing alkyd resins, PVC heat stabilizers, perfumery esters, and dye intermediates.

When should I choose Caprylic Capric Acid instead of pure Caprylic Acid (C8)?
Choose Caprylic Capric Acid when manufacturing mixed C8/C10 esters (such as standard MCT oil or coco-caprylate/caprate), polyol lubricants, herbicides, or general soaps where a lower freezing point (0–10 °C) and lower raw-material cost are advantageous. Choose pure Caprylic Acid (CAS 124-07-2) for biopharmaceutical IgG plasma fractionation, pure C8 MCT oil, single-component flavor esters, or very hard-water coolants.

Why must partially frozen drums of Caprylic Capric Acid be completely melted and mixed before use?
If a drum cools below its titer (0–10 °C), the higher-melting C10 capric acid crystallizes first and settles toward the bottom while the liquid phase becomes enriched in C8 caprylic acid. Pumping from a partially frozen container alters the C8:C10 ratio and Acid Value; gentle warming (20–35 °C) and mixing restores uniform composition.

How does Caprylic Capric Acid work in food-contact surface sanitizers?
At acidic pH (< 3.5–4.0), uncharged C8 and C10 fatty acid molecules penetrate microbial cell membranes and dissociate in the neutral cytoplasm, collapsing intracellular pH and killing bacteria and yeasts without generating foam in CIP recirculation systems.

How is Caprylic Capric Acid used in metalworking fluids?
Neutralized with alkanolamines (MEA, TEA, AMP) at pH 8.5–9.8, it forms low-foaming amine caprylate/caprate salts that chemisorb onto cast iron and steel surfaces to prevent flash rust.

Does Caprylic Capric Acid corrode metals?
Yes. Neat Caprylic Capric Acid corrodes carbon steel, cast iron, copper, brass, and zinc, causing iron or copper discoloration. Storage tanks, pumps, and lines should be made of 316L (or 304) stainless steel, HDPE, or PTFE.

What documents should be requested when purchasing Caprylic Capric Acid?
Request the Technical Data Sheet (TDS), Safety Data Sheet (SDS), and batch Certificate of Analysis (COA), along with applicable Food/E570, Cosmetic, Kosher, Halal, Non-GMO, BSE/TSE-free, or RSPO declarations.

CAPRYLIC CAPRIC ACID – TECHNICAL SUMMARY

Caprylic Capric Acid, known as Kaprilik Kaprik Asit in Turkish and registered under CAS No. 68937-75-7 and EC / EINECS No. 273-086-2 (Fatty acids, C8-10), is a saturated medium-chain fatty acid mixture composed primarily of linear C8 caprylic acid (octanoic acid, CAS 124-07-2) and C10 capric acid (decanoic acid, CAS 334-48-5). Derived by high-pressure steam splitting and vacuum fractional distillation of coconut oil or palm kernel oil, it is supplied as a clear, colorless to pale yellow oily liquid.
Because binary mixing of C8 and C10 chains depresses crystallization, Caprylic Capric Acid exhibits a low eutectic solidification point (typically 0 to 10 °C), an Acid Value of approximately 354 to 370 mg KOH/g, zero olefinic unsaturation (Iodine Value <= 0.5–1.0 g I2/100 g), and strong resistance to thermal yellowing and oxidative rancidity.
It serves as the primary oleochemical feedstock for Caprylic/Capric Triglyceride (MCT oil), cosmetic emollients, and synthetic polyol ester (POE) lubricants, and functions directly in amine-carboxylate metalworking corrosion inhibitors, low-foam acidic food-contact CIP sanitizers, agricultural contact herbicides, non-yellowing alkyd resins, PVC heat stabilizers, perfumery esters, and dye manufacturing.
Buyers sourcing Caprylic Capric Acid from Ataman Kimya are advised to specify their target application, required GC C8:C10 ratio (such as 60:40 or 55:45), Acid Value range, color and moisture limits, certification needs, packaging format, and order quantity to confirm current availability and quotation details.

Ataman Chemicals
Phone: +90 216 577 10 10
Email: info@atamankimya.com