WESTCO™ ATH Aluminum Trihydrate CAS# 21645-51-2

WESTCO™ ATH is a flame retardant/smoke suppressant that releases 35% water of crystallization when heated above 200 deg.C.. It acts as a vapor barrier that prevents oxygen from reaching a flame. Typical loading from 20 to 150 phr.

Standard Packaging:  polypropylene braided bag (50kg, 40kg, and 25kg). Other packaging available to meet customer requirements. Store in dry, ventilated area. Protect the product from exposure to moisture.


Appearance: white crystalline powder
*AI (OH)3:

99 min

*Whiteness, % std:

95 min

*Moisture, %:

0.5 max


0.52 max

*Ignition loss,%:

35 max


9.8 max

*Particle size, microns

1.2 max

*45 micron sieve residue,%

0.05 max

*Actual tech data / technical data values reported on Certificate of Analysis.

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      • Western Reserve Chemicals
      • 60 S. Seiberling Street
      • Akron, OH 44305

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