Question 1

What matting agent loading is recommended for epoxy floor coatings at 100 µm DFT?

Accepted Answer

At 100 µm DFT in two-component epoxy floor coatings, load GMATT 300 Series at 2–4% by weight in the resin component (Part A). This range achieves 15–35 GU at 60° depending on sub-grade selection. Loading above 5% in epoxy floor coatings reduces flexibility and can cause stress cracking at thermal joints in concrete substrates. Always disperse the matting agent into Part A before adding the amine hardener (Part B) to avoid premature reaction.

Question 2

How do silica matting agents affect the anti-slip performance of floor coatings?

Accepted Answer

Silica matting agents at d50 5–9 µm create controlled micro-surface roughness that contributes to anti-slip performance. Surface roughness Ra of 30–60 µm is the typical range for industrial floor coatings per EN 13036-4 (pendulum friction test). GMATT 300 Series at 3–5% loading contributes Ra values of approximately 15–25 µm — insufficient alone for high-specification anti-slip, but valuable as part of a system with coarser aggregate. For primary anti-slip, add 1–3% quartz or aluminum oxide aggregate (grit size 40–80 mesh) to the matting agent system.

Question 3

What is the correct matting agent selection for polyaspartic floor coatings?

Accepted Answer

Polyaspartic floor coatings cure within 1–4 hours (versus 12–24 hours for epoxy), creating a narrow window for matting agent dispersion and film formation. GMATT 300 Series at d50 5–8 µm is suitable for polyaspartic systems when pre-dispersed in the polyaspartic resin for at least 15 minutes before activator addition. The rapid cure rate means particle settling is less of a concern than in epoxy, but film leveling is critical — use a slow-flow polyaspartic resin variant or add a flow agent when matting above 3%.

Question 4

Can I use the same matting agent in both waterborne and solvent-borne floor coatings?

Accepted Answer

Not always. Solvent-borne floor systems (epoxy, polyurethane) work well with wax-treated or untreated GMATT 300 Series. Waterborne floor coatings (waterborne epoxy, waterborne PU) require hydrophilic-treated grades that maintain stable dispersion in aqueous media without pH-sensitive aggregation. Using a wax-treated grade in waterborne systems causes floating — the matting agent clusters at the surface and creates gloss streaking. Specify GMATT 600 Series for waterborne floor coating applications.

Question 5

How do I prevent sedimentation of matting agents in floor coating Part A?

Accepted Answer

Matting agent sedimentation in floor coating Part A occurs during the 6–24 month shelf life of the packaged product. Coarser d50 grades (5–9 µm) settle faster than fine grades. Anti-settling is achieved by combining the matting agent with 0.3–0.5% fumed silica (SEMISIL H100) which creates a thixotropic network that suspends the heavier precipitated silica particles. Alternatively, use pre-dispersed GMATT concentrates in the Part A resin. Ensure the formulation passes ASTM D869 (settling test) at both 25°C and 40°C before final approval.

Question 6

What gloss range do commercial and industrial floor coatings specify?

Accepted Answer

Commercial floor coatings (retail, hospitality) target 20–50 GU at 60° — visible sheen enhances perceived cleanliness while avoiding the slippery appearance of high-gloss finishes. Industrial floor coatings (manufacturing, warehouses) target 10–30 GU for functional matte appearance with easier surface contamination visibility. Clean room floor coatings, where high-visibility particle detection is critical, often specify 5–15 GU ultra-matte.

پارامتر	اپوکسی کف (صنعتی)	پلی‌آسپارتیک (تجاری)	PU کف	اتاق تمیز (فوق مات)
براقیت هدف (60 درجه)	10–25 GU	20–35 GU	15–30 GU	5–15 GU
d50 توصیه‌شده	6–9 µm	5–8 µm	5–7 µm	8–10 µm
بارگذاری (درصد وزنی)	2–4%	3–4%	3–5%	4–6%
عمل‌آوری سطح	واکس‌دار	واکس‌دار	واکس‌دار	واکس‌دار
محدوده DFT	80–150 µm	50–100 µm	40–80 µm	60–120 µm
کمکی ضد ته‌نشینی	SEMISIL H100 0.3–0.5%	SEMISIL H100 0.3%	SEMISIL H100 0.3%	SEMISIL H100 0.5%
گرید توصیه‌شده	سری GMATT 300	سری GMATT 300	سری GMATT 300	سری GMATT 300

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