nt cat a-304 is a highly efficient medium trimer catalyst. it improves post-curing and bonding strength. nt cat a-304 can be used in hard spray foam applications. physical properties: properties value appearance clear colorless liquid scent mild density 0.995 g/cm ³ flash point 100 f (38 c) steam pressure 0.1 mm hg at 25 °c solubility miscible...