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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

​0

100

​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

No special storage precautions noted. Material is stable under normal conditions. Avoid contact with oxidizing agents. Suitable containers: polyethylene. Plastic lined steel drum.Please consult the Safety Data Sheet of this product.ELV;GADSL;RoHS;WEEE

BLUESIL ADD 744

Red translucent paste.

Protection

HCR Additives

Paste

ELV;GADSL;RoHS;WEEE

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

Asia Pacific;Europe Middle East Africa;Central and South America;North America

For information about Storage and Shelf Life for this product, please download the Technical Data Sheet.

 Characteristics_A

 

 

AppearanceIn specificationMonocomp

 Characteristics_B

 

 

 

 

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 Brochures

 

 

Rubber General Guidehttps://www.bluestarsilicones.com/EN/Our_offer/KEC/ListInstance_Brochure_Title/RubberGeneralGuide_Brochure.pdfRubber General Guide

 TDS

 

 

 

 

 

 

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