Effects of Curative Levels

All physical properties of elastomer are sensitive to curative level.The curative level is often expressed as % Theory.
100% theory for example means the curative level used is the exact amount required to react with the prepolymer.
The table shows how Physical Properties vary with % Theory.

Physical Property	Change
Hardness	Remains unchanged between 85-100% theory .
Tensile Strength	Maximum physical properties achieved between 90-95% theory.
Tear Strength	Maximum properties at 100-105% theory. Significantly lower outside the range.
Abrasion Resistance	Remains relatively unchanged between 85-105% theory. Slightly better at 100-105% theory.
Flex Life	Maximum property at 100-105% theory.
Elongation	Maximum at 100-105% theory.
Compression set & heat resistance	Best at 85-95% theory.