Name: ATH Flame Retardant Filler for Sealants ATH-80
Brand: Coatingsink
SKU: ath-flame-retardant-sealant
Availability: InStock

Question 1

What is the flame-retardancy mechanism of ATH in sealant systems?

Accepted Answer

ATH undergoes endothermic dehydration above 220°C, releasing approximately 34.5% by weight of chemically bound water. This absorbs heat energy, dilutes combustible vapours with steam, and cools the substrate surface — all without generating halogenated or toxic by-products, making ATH preferred for low-smoke, zero-halogen fire-stop specifications.

Question 2

What ATH loading is typically needed to pass BS EN 1366-4 or UL fire-stop ratings in silicone sealants?

Accepted Answer

Loadings of 150–200 phr are common in high-performance fire-stop formulations. The D50=8 µm grade of ATH-80 balances adequate fire performance with manageable compound viscosity; coarser grades at equivalent loadings often yield faster viscosity rise but poorer dispersion and reduced char integrity.

Question 3

Is ATH-80 suitable for use in moisture-sensitive sealant systems such as acetoxy silicone?

Accepted Answer

Yes, provided the residual free moisture is kept below 0.3%, which ATH-80 meets as supplied. Surface-treated ATH variants can further reduce surface hydroxyl activity for systems where Si–OH or NCO cure kinetics are sensitive to trace water, at the cost of slightly reduced fire performance per unit loading.

Al(OH)₃ Purity	≥99.5%
Moisture Content	≤0.3%
D50 Particle Size	8 µm
Bound Water Content	~34.5%
Decomposition Onset	220°C

ATH Flame Retardant Filler for Sealants ATH-80

Specifications

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