Performance phosphite is free-flowing solid

Doverphos S9228 is a solid phosphite anti-oxidant that has high molecular weight of 852, low volatility, and a high phosphorous content. It provides good thermal stability and low volatility at extended high temperature conditions. The material has been developed to protect against discoloration and thermal degradation. This grade has good hydrolytic stability when exposed to accelerated humid aging conditions, says the producer. Because hydrolysis resistance is improved, the company reports that black specks are not formed, a condition that can happen with competitive phosphates. Melting point is a minimum of 225°C. Dover Chemical Corp., Dover, OH; +1-330-365-3607; www.doverchem.com