ACG says HTM®143 exhibits one of the lowest moisture pick-up rates of all cyanate ester systems currently on the market.

Measured on a typical high modulus carbon laminate, the outgassing characteristics of HTM143 meet the limits required by NASA:

  • Total Mass Loss (TML) of 0.112%;
  • Recovered Mass Loss (RML) of 0.023%; and
  • Collected Volatile Condensable Material (CVCM) of 0.002% [ECSS-Q-ST-70-02C].

HTM143 can generate a very high glass transition temperature (Tg) after post-cure and is used to manufacture high accuracy, dimensionally stable space structures.

During recent tests, MTM®44-1, one of ACG’s new generation of out-of-autoclave processing toughened epoxy resin matrices, also met the rigorous requirements set for space applications.

MTM44-1, which can generate a glass transition temperature (Tg) of a 180°C (356°F) after a suitable post-cure, offers:

  • Total Mass Loss (TML) of 0.307%;
  • Recovered Mass Loss (RML) of 0.056%; and
  • Collected Volatile Condensable Material (CVCM) of 0.002% [ECSS-Q-ST-70-02C].


Both resin systems have an out life of 21 days and can be used with a wide range of unidirectional, biaxial and woven carbon fibre materials.