Abbreviation for Hexanitrostilbene, also called Hexanitrodiphenylethylene.

A heat resistant explosive, commonly used in deep well charges found in the oil field or in applications requiring the explosive to withstand significant temperatures before initiation. C₆H₂(NO₂)₃.

Molecular weight 450.24, nitrogen content 18.67% melting point 316 °C; detonating velocity 7000 m/s at density of 1.7 g/cc. Made in type I and type II and grades A and B. Difference between type I and type II is primarily the particle size.

HNS has a unique small diameter of 0.020 It is relatively insensitive to heat, spark, impact and friction, yet it finds wide use as a heat resistant booster charge for military applications.