HMMAT 205 is an organic-treated silica matting agent with d50 4.5–5 µm and porosity ≥1.8 ml/g. The organic surface treatment reduces oil absorption relative to untreated grades (210–260 g/100g vs 220–270 for HMMAT 103) and imparts a lubricious surface characteristic that improves scratch and mar resistance in cured films — the primary reason furniture and leather coating formulators specify treated grades. It is the direct equivalent of Grace Syloid P607 and Evonik Acematt OK607/7000, supplied by Henan Minmetals East in 10 kg bags on FCL terms at 25–40% lower landed cost than the reference brands.
Key Features
- Organic Surface Treatment: Provides lubricity at the cured film surface, measurably improving resistance to scratching, marring, and everyday abrasion vs untreated silica matting agents.
- Optimised Oil Absorption: 210–260 g/100g — lower than untreated grades — preserves viscosity headroom at higher loading in high-solids formulations.
- d50 4.5–5 µm: Covers DFT 40–80 µm — the standard range for furniture clearcoats and leather topcoats — without introducing visible surface roughness.
- Consistent Matting Efficiency: Porosity ≥1.8 ml/g ensures predictable gloss reduction from batch to batch.
- Grace P607 · Evonik OK607/7000 Drop-In: Specification confirmed against published Grace and Evonik data; direct replacement without reformulation.
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Particle Size (d50) | 4.5–5 | µm |
| Porosity | ≥1.8 | ml/g |
| Oil Absorption | 210–260 | g/100g |
| Loss on Drying (2h @ 105°C) | ≤5 | % |
| Loss on Ignition | ≤9 | % |
| pH Value (5% aqueous) | 6–8 | — |
| SiO₂ Content | ≥99 | % |
| Surface Treatment | Organic | — |
| Packaging | 10 kg bags | — |
| Equivalent Grade | Grace Syloid P607 · Evonik Acematt OK607 / 7000 | — |
Per HMMAT product profile. Refer to batch CoA for release data.
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Applications
- Furniture Clearcoats (DFT 40–70 µm): 4–8% in PU or NC clearcoats; organic treatment delivers the scratch and abrasion resistance demanded by furniture OEMs and their end-use performance standards.
- Leather Topcoats: 3–6% in polyurethane leather finishing; lubricious surface reduces scuffing during flexing and handling of finished leather goods.
- High-Solids Coatings: Lower oil absorption (210–260 vs 220–270) gives more formulation latitude at >60% solids without viscosity spike.
- Plastic Coatings: 3–6% in solvent-borne or UV-cure coatings on ABS, PC, or PP where fingerprint and scratch resistance are specified.
When to Choose HMMAT 205 vs Alternatives
Specify HMMAT 205 when scratch and mar resistance are a formulation requirement alongside gloss reduction. For systems where organic treatment would interfere with inter-coat adhesion or UV-cure chemistry, use HMMAT 103 (untreated, d50 4–4.5 µm). For finer film texture in thin DFT systems, use HMMAT 101 (untreated, d50 3.5–4 µm). Among treated grades in the 200 series, HMMAT 206 (d50 5.5–6 µm) addresses coarser films. Against Grace Syloid P607 or Evonik Acematt OK607/7000, HMMAT 205 delivers equivalent performance at 25–40% lower FCL landed cost.