Description
ACEMATT ® OK 500 is a wax-treated, medium particle sized precipitated silica. By offering very high compatibility, it can be used in a large variety of coatings.
It has been optimized to have a minimal impact on drying times.
Key benefits
Very low viscosity impact
High surface smoothness
All purpose silica
General industrial coatings
Wood coatings
Plastic coatings
Car oem coatings
| carbon content | 5.50% |
| DOA absorption | 250 ml/100g |
| Grindometer value | 27 µm |
| particle size, d50 | 6.3 µm |
| pH-value | 6.3 |
| specific surface area (N2) | 130 m²/g |
Handling& Storage of Evonik ACEMATT OK 500 CAS No. 9002-88-4
When stored the extinction powder ACEMATT OK 500 in an original unopened packaging, the product has a shelf life of 24 months from the date of manufacture.
Werecommend tostore the product in closed containers under dry conditions and to protect the material from volatile substances.
Q1: What is the primary function of ACEMATT OK 500 in coating and ink formulations?
A: ACEMATT OK 500 is a silica-based matting agent designed to reduce surface gloss and improve tactile feel in solvent-borne and high-solids coatings, printing inks, and overprint varnishes. Its spherical particle morphology contributes to uniform matting performance with good transparency and minimal impact on viscosity.
Q2: How should ACEMATT OK 500 be incorporated into a formulation?
A: It is typically added during the pigment grinding or let-down stage using high-shear dispersion equipment. Pre-wetting with compatible solvents or resins is recommended to ensure optimal deagglomeration and stable suspension. Avoid excessive shear that may fracture particles and compromise matting efficiency.
Q3: Is ACEMATT OK 500 suitable for use in food-contact compliant systems?
A: ACEMATT OK 500 is not specifically certified for direct food contact applications. While it meets general industrial safety and handling requirements, formulators must validate compliance with applicable regional food-contact regulations based on the final formulation, application method, and intended use conditions.
Q4: How does ACEMATT OK 500 compare to other ACEMATT grades in terms of matting efficiency and transparency?
A: Compared to coarser grades like ACEMATT TS 100, OK 500 delivers higher transparency and smoother surface appearance at equivalent gloss reduction levels. It offers a balanced profile between matting effect and clarity—making it especially suited for premium decorative and functional coatings where visual quality is critical.
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