CRAYVALLAC SL

Product Details

CRAYVALLAC® SL is a high performance micronised amide wax rheology modifier designed for the high temperature manufacture of moisture curing methoxysilane based sealants.

CRAYVALLAC® SL is also suitable for the high temperature manufacture of moisture curing methoxysilane based adhesives.

CRAYVALLAC® SL is designed for use in one component methoxysilane sealants where in comparison to hydrogenated castor oil based products and fumed silica its key advantages are minimal effect on modulus and very good stability on storage. With one component moisture curing methoxysilane based sealants,

CRAYVALLAC® SL is generally added along with the initial charge of methoxysilane polymer and plasticiser to a vacuum dispersion vessel with heating capability. This is followed by the pigments and extenders. Efficient activation of CRAYVALLAC® SL is achieved during the vacuum dispersion stage by allowing the batch temperature to rise to 90 - 115°C (194 - 239°F). This condition of dispersion would typically be maintained for approximately 30 minutes at 110°C (230°F), or until the required level of dispersion is obtained and a suitably low moisture content has been achieved (typically < 800 p.p.m.). Following this, the batch temperature is lowered sufficiently to allow for the safe addition of such additives as moisture scavengers, adhesion promoters and reaction catalysts.