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RHEOFLOW DS-425 acts as a wetting and dispersing rheology modifier that enhances material flow and uniformity during processing and application.
RHEOFLOW DS-425 improves formulation robustness by reducing internal friction, supporting efficient mixing, and promoting consistent mold or film filling.
RHEOFLOW DS-425 is widely used in coatings, inks, adhesives, and industrial systems where stable rheology and high-quality surface appearance are required.
CAS Number: 7631-86-9
EC Number: 231-545-4
Molecular Formula: O2Si
Molecular Weight: 60.08
Synonyms: amorphous, Amorphous silica, Colloidal silica, Diatomaceous silica, White carbon, Cab-O-Sil M-5, Aerosil (fumed silica), Sipernat, Ultrasil VN 3, Ultrasil VH 3, Vulkasil S, Santocel, Zeofree 80, Snowtex O, Snowtex 30, LICHROSORB SI 100 (10 MYM) 10 G, TLC-SILICA GEL 60 GF254 MEAN PARTICLE SI, LICHROSORB SI 100 (10 MYM) 100 G, SEA SAND EXTRA PURE 5 KG, SILICA GEL 60 GF254 FOR THIN-LAYER CHROM, Zorbax Sil, Porasil, Carplex, Carplex 30, Carplex 80, Neosil, Neosyl, Siloxid, Zipax, Corasil II, Tokusil TPLM, Extrusil, Acticel, Dri-Die, Manosil VN 3, Wessalon, SILICA GEL 60 PF254 FOR PREPARATIVE LAYE
RHEOFLOW DS-425 is a rheology-modifying and dispersion-enhancing additive designed to improve flow behavior, viscosity control, and stability in liquid and semi-liquid formulations.
RHEOFLOW DS-425 is used to optimize shear-dependent flow properties, helping formulations achieve easier processing, improved leveling, and reduced settling of pigments or fillers.
RHEOFLOW DS-425 is commonly applied in coatings, paints, inks, adhesives, and other industrial systems where controlled rheology and consistent performance during application and storage are required.
RHEOFLOW DS-425 is an unsaturated polycarboxylic acid polymer.
RHEOFLOW DS-425 acts as a wetting and dispersing agent.
RHEOFLOW DS-425 prevents cratering, pinholes, fish eyes, has excellent de-aerating and good film appearance.
RHEOFLOW DS-425 is suitable for industrial coatings, architectural coatings and coil coatings.
RHEOFLOW DS-425 is a processing additive and flow modifier used primarily in rubber and elastomer compounding.
RHEOFLOW DS-425 is designed to improve the flow behavior of rubber compounds during mixing and shaping operations, helping the material fill molds more uniformly and process more easily.
By enhancing flow, RHEOFLOW DS-425 contributes to more stable and efficient processing.
From a formulation perspective, RHEOFLOW DS-425 is a commercial mixture rather than a single chemical substance.
RHEOFLOW DS-425 is typically based on fatty-acid derivatives and lubricating components that reduce internal friction within the rubber compound.
RHEOFLOW DS-425 also helps lower energy consumption during mixing by improving compound workability.
RHEOFLOW DS-425 is valued for its ability to support consistent processing and productivity in high-volume rubber manufacturing.
RHEOFLOW DS-425 can shorten mixing times, improve mold filling, and reduce defects related to poor flow or incomplete filling.
Uses of RHEOFLOW DS-425:
RHEOFLOW DS-425 is used as a rheology-modifying additive to control viscosity, flow, and stability in coatings, paints, inks, adhesives, and sealant formulations.
RHEOFLOW DS-425 helps prevent pigment and filler settling while improving leveling, sag resistance, and application behavior during processing and end use.
By providing stable and shear-responsive flow properties, RHEOFLOW DS-425 supports consistent application performance and long-term formulation stability.
RHEOFLOW DS-425 is found in sunscreens, scrubs, and wide range of other skin care, makeup, and hair care preparations.
RHEOFLOW DS-425 has been successfully used in hypoallergenic and allergy-tested formulations.
RHEOFLOW DS-425 is mined from deposits of diatomaceous soft chalk-like rock (keiselghur).
This is an important group of extender pigments, which is used in a variety of particle sizes.
They are used as a flatting agent to reduce gloss of clear coatings and to impart shear thinning flow properties to coatings.
They are relatively expensive.
RHEOFLOW DS-425 is used to improve processability of rubber compounds by acting as an internal flow modifier during mixing, extrusion, calendering, and molding.
RHEOFLOW DS-425 facilitates smoother material flow under shear, which helps rubber compounds pass more easily through dies, molds, and calender gaps.
This improves consistency and reduces processing-related difficulties.
RHEOFLOW DS-425 is widely used in formulations where high filler loadings are required, such as carbon black– or silica-filled rubber compounds.
By improving filler wetting and dispersion, RHEOFLOW DS-425 helps achieve more homogeneous compounds with stable mechanical performance.
This is particularly beneficial for technical and automotive rubber applications.
Advantages of RHEOFLOW DS-425:
RHEOFLOW DS-425 provides effective viscosity and flow control, enabling smooth application while maintaining good sag resistance and leveling.
RHEOFLOW DS-425 helps prevent pigment and filler settling, improving storage stability and uniformity of formulations.
RHEOFLOW DS-425 supports shear-responsive rheology, allowing easy processing under shear while maintaining structure at rest.
RHEOFLOW DS-425 enhances application performance, contributing to consistent surface appearance and reduced defects.
RHEOFLOW DS-425 improves formulation robustness and reproducibility across coatings, inks, adhesives, and related industrial systems.
Stability and Reactivity of RHEOFLOW DS-425:
Chemical stability:
RHEOFLOW DS-425 is chemically stable under normal conditions of use, handling, and storage.
Reactivity:
No hazardous reactions are expected under normal conditions.
Conditions to avoid:
Excessive heat, open flames, and prolonged exposure to extreme temperatures.
Incompatible materials:
Strong oxidizing agents.
Hazardous decomposition products:
Thermal decomposition may produce carbon oxides (CO, CO₂) and other irritating organic fumes.
Handling and Storage of RHEOFLOW DS-425:
Handling:
Handle in accordance with good industrial hygiene and safety practices.
Avoid contact with eyes and prolonged skin contact.
Storage:
Store in tightly closed containers in a cool, dry, and well-ventilated area.
Storage conditions:
Protect from heat sources, direct sunlight, and moisture.
Packaging materials:
Use compatible, inert containers as recommended by the supplier.
Shelf life:
Stable with a long shelf life when stored under recommended conditions.
First Aid Measures of RHEOFLOW DS-425:
Inhalation:
Remove person to fresh air.
Seek medical attention if respiratory discomfort persists.
Skin contact:
Wash skin thoroughly with soap and water.
Remove contaminated clothing.
Eye contact:
Rinse cautiously with water for several minutes.
Remove contact lenses if present and easy to do.
Seek medical advice if irritation persists.
Ingestion:
Rinse mouth with water.
Do not induce vomiting.
Seek medical attention if discomfort occurs.
Most important symptoms:
Mild irritation of eyes, skin, or respiratory tract.
Firefighting Measures of RHEOFLOW DS-425:
Suitable extinguishing media:
Foam, dry chemical powder, carbon dioxide (CO₂), or water spray.
Specific hazards:
Combustible organic material.
Smoke and irritating fumes may be released during combustion.
Protective equipment for firefighters:
Self-contained breathing apparatus and full protective clothing.
Special precautions:
Cool exposed containers with water spray.
Avoid inhalation of combustion products.
Accidental Release Measures of RHEOFLOW DS-425:
Personal precautions:
Avoid direct contact and inhalation of vapors or mists.
Use appropriate personal protective equipment.
Environmental precautions:
Prevent large quantities from entering drains, soil, or watercourses.
Methods for cleanup:
Absorb spill with inert absorbent material.
Collect in suitable containers for disposal according to local regulations.
Exposure Controls / Personal Protective of RHEOFLOW DS-425:
Occupational exposure limits:
Not established.
Engineering controls:
Adequate general ventilation is recommended.
Respiratory protection:
Not normally required.
Use a respirator if ventilation is insufficient.
Hand protection:
Protective gloves recommended for prolonged or repeated contact.
Eye protection:
Safety glasses or goggles recommended.
Skin protection:
Protective work clothing as appropriate.
Hygiene measures:
Wash hands after handling.
Avoid eating, drinking, or smoking in work areas.
Identifiers of RHEOFLOW DS-425:
CAS DataBase Reference: 7631-86-9
NIST Chemistry Reference: Silicon(iv) oxide
IARC: 3 (Vol. Sup 7, 68) 1997
EPA Substance Registry System: Silica
ECETOC JACC REPORT: RHEOFLOW DS-425
CAS Number: 7631-86-9
Molecular Formula: O2Si
Molecular Weight: 60.08
EC Number: 231-545-4
Chemical class: Specialty formulation additive (non-ionic / associative-type rheology modifier, formulation-dependent)
Appearance: Liquid
Color: Clear to slightly hazy, light yellow
Odor: Mild, characteristic
Properties of RHEOFLOW DS-425:
Physical state: Liquid
Appearance: Clear to slightly hazy liquid
Color: Light yellow
Odor: Mild, characteristic
Solubility: Dispersible in water-based systems; compatible with selected solvent-based formulations
Density: Approximately 1.00–1.10 g/cm³ at 20 °C
Viscosity: Low to medium viscosity; shear-responsive behavior
pH: Typically neutral to slightly alkaline (aqueous systems)
Flash point: > 100 °C
Thermal stability: Stable under normal processing and storage temperatures
Chemical stability: Stable under normal formulation conditions
Volatility: Low
Melting point: >1600 °C(lit.)
Boiling point: >100 °C(lit.)
Density: 2.2-2.6 g/mL at 25 °C
Bulk density: 200-800kg/m3
Vapor pressure: 13.3hPa at 1732℃
Refractive index: 1.46
Fp: 2230°C
Storage temp.: 2-8°C
Form: suspension
pka: 6.65-9.8[at 20 ℃]
Specific Gravity: 2.2
Color: White to yellow
Odor: at 100.00?%. odorless
PH: 5-8 (100g/l, H2O, 20℃)(slurry)
Resistivity: 1∞10*20 (ρ/μΩ.cm)
Water Solubility: insoluble
Sensitive: Hygroscopic
Hydrolytic Sensitivity 6: forms irreversible hydrate
Crystal Structure: Trigonal
Merck: 14,8493
