CABOSIL

Cabosil is used adhesives, sealants, coatings, paints, varnishes.
Cabosil is used thickening & reinforcement in silicone, rubber, inks, toners.
Cabosil is used gel-cell acid electrolyte suspensions.

CAS Number: 112945‑52‑5 (specific to Cab‑O‑Sil), more generally 7631‑86‑9 for amorphous silica 
EC Number: 262‑373‑8 (specific), more generally 231‑545‑4 
Formula: SiO₂ (synthetic amorphous silica) 

SYNONYMS:
Silicon dioxide, Synthetic amorphous silica, Pyrogenic silica, Fumed colloidal silica, Silica fume, Cab‑O‑Sil, Cabosil, Aerosil, White Carbon Black, silicic anhydride, Silicon dioxide, Synthetic amorphous silica, Pyrogenic silica, Fumed colloidal silica, Silica fume, Cab‑O‑Sil, Cabosil, Aerosil, White Carbon Black,

Cabosil is the name for a range of amorphous fumed silica products made by Cabot Corporation.
The molecular structure of Cabosil consists of nanometre droplets of amorphous silica fused into branched chains.
They are characterised by high purity, low bulk density and submicron particle size.

Cabosil is a medium surface area fumed silica which imparts a significant increase in viscosity to liquid systems, free flow of powders and reinforcement of silicone and organic rubbers.
Cabosil is a medium surface area fumed silica which has been surface modified with polydimethylsiloxane.

The treatment renders Cabosil extremely hydrophobic, with very different properties to untreated silica grades like M5.
Cabosil is a extremely light powder used as a resin thickener it is ideal for vertical surfaces to avoid sags and run-off.
Cabosil is a light, fluffy powder that is white in appearance and is used in many applications in the surf industry.

Cabosil is a thixotropic paste designed to give resin vertical hanging capabilities.
Cabosil works very well with epoxy and polyester/vinylesters.
Cabosil has a clear appearance when mixed.

Cabosil is an epoxy thickening agent for resins and gel coats.
Add Cabosil to make a paste.
Stir or mix Cabosil in.

Cabosil stands as utra light white powder.
Cabosil is a high-purity, non-crystalline silica produced via flame hydrolysis, consisting of discrete submicron silica spheres fused into branched aggregates.

Cabosilcrystalline‑free, hydrophilic, with extremely high surface area—ideal for rheological control, thickening and stabilizing in diverse industrial systems.
Cabosil is a synthetic, amorphous, colloidal silicon dioxide that is generally regarded as unique in industry because of its unusual particle characteristics.

Cabosil’s extremely small particle size, its enormous surface area, its high purity, and its chain-forming tendencies set it apart in a class of its own.
Cabosil is a light, fluffy powder that is white in appearance and is used in many applications and a variety of industries.

Cabosil is a untreated medium surface fumed silica that provides thickening, thixotrophic, and anti-settling behavior in liquid systems.
Cabosil is most efficient in non-polar to medium polarity systems, and provides increases in hardness, tensile strength and elongation.
Cabosil can be used for reinforcement of silicone and organic rubbers.

Cabosil is well suited for use in coatings, adhesives, and other liquid systems.
Cabosil is a medium surface fumed silica used in adhesives.
Cabosil provides thickening, thixotrophic (shear thinning), and anti-settling behavior in liquid systems.

Cabosil untreated fumed silica is a synthetic, amorphous, colloidal silicon dioxide that is generallyregarded as unique in industry because of its unusual particle characteristics.
Cabosil’s extremely small particle size, its enormous surface area, its high purity, and its chain-forming tendencies set it apart in a class of its own.

Cabosil is a light, fluffy powder that is white in appearance and is used in many applications and a variety of industries.
Cabosil is a medium surface fumed silica which enables a significant increase in viscosity in liquid systems, free flow of powders and reinforcement of silicone and organic rubbers.

Cabosil is most efficient in non-polar to medium polarity systems and offers an excellent balance of thickening efficiency and dispersibility.
Key characteristics of Cabosil include high purity, aggregated structure, submicron particle size, low bulk density and hydrophilic surface.
Cabosil is medium surface fumed silica.

Cabosil is widely used to provide thickening, thixotrophic (shear thinning), and anti-settling behavior in liquid systems.
Cabosil is most efficient in non-polar to medium polarity systems.
Cabosil is Fumed silica powder and is used as a thickening agent for resins.

Cabosil can be added to polyurethane, polyester, vinylester or epoxy resins to increase viscosity.
Cabosil is a very fine powder and easily airborne so a dust mask should be worn when using it.
Cabosil is a thixotropic agent which prevents sagging or dropping of resin when applied on vertical surfaces.

Cabosil is also ideal to use as a thickener with Pros-aide to create transfers.
This is the thixotrope which makes the resin and gelcoat non drip, thixotropic resins will have between 0.75 - 1% by weight included in the formulation and gelcoats around 2.5% .
Cabosil is a thixotrope which when added to resin and gelcoat will make them non drip.

USES and APPLICATIONS of CABOSIL:
Cabosil is used Aerosil filler for epoxy and polyester resin.
It finds practical use in several key applications, such as: Securing fin boxes with precision, Enhancing the viscosity of epoxy tints, Effectively repairing dings and blemishes, Reinforcing boards against unexpected breakages.

Store Cabosil at ambient temperatures in a clean, dry area away from humidity and chemical vapors.
Store in Cabosil's original package as long as possible.
Cabosil thickens resins of all kinds

From light gels to thick pastes
Cabosil reduces sag for vertical coatings
Easily mixes into resins

Cabosil mixes clear at lower levels to white in pastes
Thicker mixtures can be vacuumed to make them clearer
Cabosil reduces shrinkage

Cabosil increases anti-corrosive qualities in resins
Cabosil improves compressive strength
Cabosil disallows settling of particles (like glitter) in resin systems

Great for setting fin boxes & leash cups
Cabosil is a resin thickener.
Not to be confused with Microballoons which is a resin “extender” that mixes with resin to get super-strong glass bubbles into the medium and "fluffs it up", (not getting technical).

Cabosil, on the other hand causes the resin to have increased internal cohesive forces.
In low quantities, Cabosil causes the resin not to sag or run.
In higher concentrations, Cabosil causes the resin to get thicker and more like a paste.

If you mix in a cup, you will inevitably entrap air and the resulting paste will turn white.
If you heat the resin (<100°F) and apply a vacuum, you can get the resin to make a clear, jelly-like colloidal.
A thixotropic agent which prevents sagging or dropping of resin when applied on vertical surfaces.

Also ideal to use as a thicken with Pros-aide to create a creamy formula which helps prevent any dripping.
An extremely fine powder, Cabosil, used to thicken virtually every liquid material.
Cabosil is typically used to thicken resin, paint, dyes, and even water.

Cabosil is great for making fillet putty, thickening epoxy for a better glue consistency.
Milled Glass Fibers can produce a high strength non-sagging structural adhesive.
3M Glass Bubbles produce an easy spreading and sanding faring compound.

Proper sequence for mixing these compounds is to first measure catalysts or hardener into resin and mix thoroughly.
Next, add fiber reinforcements and mix to assure complete fiber wet out.
Fillers such as 3M Bubbles follow with the Cabosil is added last.
Mix well.

Cabosil can contribute to difficulties in sanding.
Where sanding will follow, use only as much Cabosil as is required to impart thixotrophy.
Cabosil can be used for: Installing fin boxes, Thickening up tints for epoxy, Solid ding repairs, Board snaps.

Cabosil is light weight, low density fumed silica powder additive for use in all types of Resins and Gelcoats although, when used to thicken polyester or vinylester resins, creates an excellent medium sanding, non-slumping compound.
Cabosil is light weight, low density fumed silica powder additive for use in all types of Resins and Gelcoats although, when used to thicken polyester or vinylester resins, creates an excellent medium sanding, non-slumping compound.

Cabosil is an extremely fine powder used to thicken virtually every liquid material.
Cabosil is typically used to thicken resin, paint, dyes, and even water.
Cabosil is great for making fillet putty, thickening epoxy for a better glue consistency, and for use below the waterline.

Resin mixed with Cabosil is an ideal product for repairing the blisters that are so common on fiberglass boats.
Cabosil is used in approximately a 1:1 ratio to the mixed resin by volume.
This will provide a consistency similar to vaseline.

You may use more or less to suit your application.
Cabosil adds a milky white color to the resin.
Silica is an agent which is used to control the thixotropy or ‘sag’ characteristics of a resin system.

By adding colloidal silica powder in varying amounts to a resin mix the handling and flow characteristics can be controlled.
Relatively small quantities added to a resin mix containing glass bubbles or micro balloons will give non-sag properties and impart easier handling.

Silica is also used with microfibres to produce a mix suitable for use as a high strength, non-sagging structural adhesive, particularly for non-absorbent materials such as grp.
The inclusion of colloidal silica has the effect of increasing the hardness of the resulting mix which will create more difficulty when sanding.

For this reason silica is usually added in the minimum quantities to any mix for which sanding is anticipated.
In some applications this feature can be used to an advantage, for example to create a hard wearing edge or surface.
Cabosil is used filler Thickening powder for epoxy, silicones, paints, varnishes, and liquids.

Fill cracks, voids and create non-sagging properties.
Light weight material easily mixes into liquids.
Cabosil is a fumed lightweight silica thickener used to reduce the flow of epoxies on vertical surfaces, as well as filling pinholes with its smooth texture.

Cabosil, also known as Aerosil is a thickening agent for epoxies, polyesters, and urethanes.
Thicken resins to your own liking by adding varying amounts for gap filling, to reduce running and sagging, and making resin glue.
Cabosil is ideal for making adhesives and putties for gluing wood, fiberglass, stone, concrete, etc.

However, adding Cabosil will make the cured resin a bit more difficult to sand.
Cabosil is typically used in surfboard construction for leash plug and finbox installs to reduce the amount of resin draining into the foam and also increase the bond strength to the fin box or plug.

Cabosil can be added to epoxy resin to seal EPS blanks for additional strength.
Recommended Use of Cabosil: Rheological control; Flow agent; Anti-caking agent; Anti-blocking agent; Anti-settling agent; Spray aid; Thickening agent; Carrier; Viscosity control agent; Glossing or matting agent; Chemical intermediate; Stabilization agent; Filler; Reinforcing agent in: Coatings.

Cabosil is used Adhesives, Sealants, Silicone Elastomer, Rubber products, Suspension, Dispersion, Batteries, Cosmetics,
Inks and toners, Paints, Hygiene and sanitary products.
Cabosil is used around the world to meet challenging performance requirements.

Due to its unique particle characteristics, Cabosil provides superior performance benefits for many types of applications, including:
Adhesives and sealants, Agriculture and lawn care, Chemical mechanical planarization (CMP), Coatings, Composites, Food additives, Greases, Pharmaceuticals, Printing and packaging, Silicone sealants, Skin and beauty care products, and Performance benefits.

Industrial formulations: Cabosil ids used adhesives, sealants, coatings, paints, varnishes.
Plastics and elastomers: Cabosil is used thickening & reinforcement in silicone, rubber, inks, toners.
Batteries: Cabosil is used gel-cell acid electrolyte suspensions.

Cabosil is used cosmetics & hygiene products (technical grade, caution for pharma use disclaimers).
Cabosil is used Powder flow agent, spray aid, anti‑settling and anti‑caking agent in many manufacturing sectors.
Cabosil is an extremely light powder used as a resin thickener it is ideal for vertical surfaces to avoid sags and run-off.

Cabosil is recommended no more than 1/2 part filler to 1 part of resin.
Cabosil is used Adhesives & Sealants, Coatings, Foods, Cosmetics, Composites.
Cabosil offers an excellent balance of thickening efficiency and dispersibility.

Cabosil exhibits high purity, aggregated structure, submicron particle size, low bulk density and hydrophilic surface chemistry.
When blended into sticky and poorly flowing powder systems, Cabosil reduces the angle of repose and improves powder flow.
Cabosil can be used as a rheology control additive in all resin systems, when hydrophobicity and shelf stability are of only moderate concern.

Cabosil can also be used as a thickener in Pros-Aide or Pro-Key to produce transfers.
Cabosil is a thixotrope which when added to resin and gelcoat will make them non drip.
Cabosil can also be used as a thickener in Pros-Aide or Pro-Key to produce transfers.

Cabosil is not easy to disperse without a mechanical stirrer, you can mix by hand, however it will not develop its full effect if not completely mixed.
Cabosil should be used with personal safety equipment at all times.

Cabosil is an extremely fine powder used to thicken virtually every liquid material.
Cabosil is typically used to thicken resin, paint, dyes, and even water.
Cabosil is an extremely fine powder used to thicken virtually every liquid material.

Cabosil is typically used to thicken resin, paint, dyes, and even water.
Cabosil is great for making fillet putty, thickening epoxy for a better glue consistency, and for use below the waterline.
Cabosil is an ideal product for repairing the blisters that are so common on fiberglass boats.

For a given weight or volume of Cabosil, it has an extremely large amount of surface area.
Resin, being a petrochemical with an oily feel, tends to drain off a vertical surface; by adding Cabosil, the resin can be made to stay in place on a vertical surface.

Cabosil is also mixed with Milled Fiber for structural putty and or microspheres (Q-Cells) for sandable putty.
Cabosil is used in approximately a 1:1 ratio to the mixed resin by volume.
This will provide a consistency similar to vaseline.

You may use more or less to suit your application.
Cabosil adds a milky white color to the resin.

FUNCTION of CABOSIL:
The incorporation of Cabosil in polyesters is a function of a number of variables.
Several of the variables that can have an influence on the performance of the dispersion are:
*Grade of Cabosil
*Concentration of Cabosil
*Dispersion condition (intensity, equipment, etc.)
*Resin chemistry and molecular weight distribution
*Styrene concentration
*Free glycol content
*Nature of the other additives used in a polyester resin formulation
*Among the more predictable effects are those of silica grade, silica loading and dispersion conditions.
*The differences in behavior imposed by the resin chemistry and the presence of additives are complex, often making Cabosil impossible to draw any general conclusions.
*All of these factors should be considered when setting viscosity specifications for a particular product.

BENEFITS of CABOSIL:
*High purity
*Aggregated structure
*Submicron particle size
*Low bulk density
*Hydrophilic surface

FUNCTIONS of CABOSIL:
*Rheology Control 
*Reinforcement
*Free Flow 
*Suspension 
*Adsorbant 

FUNCTION & MECHANISM of CABOSIL:
*Cabosil provides thixotropic rheology control, stabilizer, anti‑settling, anti‑caking agent.
*Cabosil increases viscosity, prevents phase separation or settling in suspensions, coatings, adhesives.
*Cabosil enhances flowability in powders; serves as a reinforcing filler in polymers and silicone rubbers.
*Cabosil is used as matting or bulking agent in finishes and varnishes.

BENEFITS of CABOSIL:
The versatility of Cabosil is related to its wide range of surface areas and aggregate structure, both of which lead to unique performance benefits, including:
*Anti-settling, thickening and sag resistance.
*Scratch and abrasion resistance.
*Free-flow and anti-caking.
*Corrosion resistance.
*Enhanced adsorbency.
*Reinforcement.

✅ KEY CHARACTERISTICS & BENEFITS of CABOSIL:
*Ultra‑high purity (SiO2 > 99.8 %) with minimal impurities.
*Very low bulk density—lightweight powders.
*Hydrophilic surface; disperses well in polar to medium-polarity media.
*High surface area for efficiency at low loadings.
*Non‑crystalline and non‑hazardous by regulation; free‑flowing and non‑combustible.

PHYSICAL and CHEMICAL PROPERTIES of CABOSIL:
Chemical Name: Synthetic Amorphous Silica
Formula: SiO₂
Molecular Weight: 60.08 g/mol
CAS Number: 112945‑52‑5 (specific to Cab‑O‑Sil); more generally 7631‑86‑9
EC Number: 262‑373‑8 (specific); more generally 231‑545‑4
MDL Number: MFCD00011232

Appearance: White, dry powder; fine powder
Density / Specific Gravity: ~2.2 g/cm³ @ 20 °C; bulk density approx. 40 g/L (~0.04 g/cm³)
Melting Point: ~1,700 °C; 1,719 °C
Boiling / Sublimation Point: ~2,230 °C
pH (4% aqueous solution): ~3.6–4.5
Water Solubility: Slightly soluble / practically insoluble under most conditions (OECD 105)

Particle Size:
– Primary particles: ~5–50 nm
– Aggregates: Micron-sized branched structures
BET Surface Area:
– Typical: ~170–230 m²/g
– Range (depending on grade): 200–390 m²/g
Applications:
Rheology control, anti-caking agent, filler, coatings, adhesives, sealants, reinforcement

Safety:
Low toxicity; dust inhalation may cause irritation; only reversible mild effects observed
Environmental Information:
Inert, non-toxic
Handling Instructions:
Use PPE, ensure adequate ventilation, avoid dust formation, store sealed and dry, avoid ignition sources
Storage Temperature: Ambient
Compound Canonicalized: Yes

FIRST AID MEASURES of CABOSIL:
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation: 
Fresh air.
*In case of skin contact: 
Take off immediately all contaminated clothing. 
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact: 
Rinse out with plenty of water. 
Call in ophthalmologist. 
Remove contact lenses.
*If swallowed:
After swallowing: 
Immediately make victim drink water (two glasses at most). 
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available

ACCIDENTAL RELEASE MEASURES of CABOSIL:
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains. 
Collect, bind, and pump off spills. 
Observe possible material restrictions. 
Take up dry. 
Dispose of properly. 
Clean up affected area.

FIRE FIGHTING MEASURES of CABOSIL:
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2) 
Foam 
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.

EXPOSURE CONTROLS/PERSONAL PROTECTION of CABOSIL:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection. 
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A 
-Control of environmental exposure:
Do not let product enter drains.

HANDLING and STORAGE of CABOSIL:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed. 
Dry.

STABILITY and REACTIVITY of CABOSIL:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature).
-Possibility of hazardous reactions:
No data available