BLUESIL ADD 744 is added to HCR’s on a 2-roll mill.
Doses of 0.3 to 0.5 % by weight with respect to the HCR pre-catalysed compound have a very pronounced effect on the heat stability of silicone elastomers, up to a temperature of 250°C.
Comment: With transparent HCR compounds BLUESIL ADD 744 can cause slight yellowing.
Improving the heat stability of MF 135 U and MF 175 U by adding BLUESIL ADD 744:
For example, the table below gives the change in mechanical properties for MF 135 U and MF 175 U with and without the addition of BLUESIL ADD 744, under various heat ageing conditions.
These properties are obtained after adding 2-4 dichloro benzoyl peroxide with 50 % active ingredients (Peroxide E) and curing for 8 minutes at 115 °C.


​MF 135 U​100​100​0​0
​MF 175 U​0​0100​100
Peroxide E​1.1​1.1​1.25​1.25
​ADD 744​0​0.3​0​0.3

Properties after post-curing for 4 hours at 200 °C:

Shore A hardness​40​40​70​70
Tensile strength MPa​7.1​7​9.5​9.7
Elongation at break %​390​400​280​310
​Modulus at 100 %, MPa​0.8​0.7​2.7​2.6
​Modulus at 300 %, MPa​3.5​3.3​-​-
​Tear strength, kN/m​21​21​21​21
​Resilience, %​50​51​43​40

Properties after heat ageing for 3 days at 225 °C

​Shore A hardness​46​44​80​78
​Tensile strength, MPa​5.8​6.2​6.2​6.4
​Elongation at break, %​250​290​120​200


Properties after heat ageing for 7 days at 250 °C

​Shore A hardness​B​44​B​81
​Tensile strength, MPa​-​5​-5.3
​Elongation at break, %​​-​230​​-​170

B = Brittle

BLUESIL ADD 744 储存温度介于 -5°C / 23°F 和 40°C / 104°F 之间时,从生产日期开始产品保质 18 个月



Red translucent paste.



BLUESIL ADD 744 is a particularly effective heat stabiliser for heat cure silicones. It protects cured compounds to a temperature of 250°C for prolonged periods





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