HCR 135 U is a silicone master-batch, vulcanizing under heat after addition of a vulcanizing agent (chosen according to the transformation procedure).

Details

HEAT CURED SILICONE RUBBER  HCR 135U

Description： HCR 135 U is a silicone master-batch, vulcanizing under heat after addition of a vulcanizing agent (chosen according to the transformation procedure).

Applications：Moulding, injection, extrusion of articles with good mechanical properties.

Special properties：

Slight replastification after prolonged storage

Easy to process

No post-cure or slight post-cure

Low hardness, but good mechanical properties

Good stability up to 200℃

Transparency

Wide range of reloading or blending

Characteristics：

Type(in accordance with ISO 1629-1995) ………………………………………… VMQ

Density at 25℃, g/cm3, approx………………………………………………………… 1.11

Aspect……………………………………………………………… Colorless, transparent

Properties after working:

(1) After addition of 1.1% Di(2,4-dichlorobenzoyl) peroxide (at 50%), and vulcanization for 8min at 115℃

(2) After addition of 1.0% 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane (at 45%), and vulcanization for 10 minutes at 170℃

1. Mechanical properties

1.1 Properties without post-cure                    (1)        (2)

Shore A hardness, approx……………………………….       36         34

Tensile strength, MPa, approx…………………………………  7.3        7.7

Elongation at break, %, approx………………………………  480        520

Modulus at 100% elongatioin, MPa, approx ………    0.95        0.8

Tear strength, kN/m, approx…………………………………   17         18

Rebound resilience, %, approx…………………………………  52        45

Linear shrinkage, %, approx…………………………………    2.4        3.2

1.2 Properties after post-cure for 4 hours at 200℃   (1)        (2)

Shore A hardness, approx…………………………………….     41        39

Tensile strength, MPa, approx…………………………………   8.2       8.8

Elongation at break, %, approx……………………………     420      535

Modulus at 100% elongatioin, MPa, approx ……………   1.1      0.9

Tear strength, kN/m, approx…………………………………     17      19

Compression set (22h/177℃/25%), %, approx………     39       28

Rebound resilience, %, approx…………………………………   53       46

Linear shrinkage, %, approx…………………………………      3.1      4.1

2. Heat stability

Properties after heat-ageing 10 days at 200°C

Shore A hardness, approx……………………………………      42       45

Tensile strength, MPa, approx…………………………………    7.6      7.7

Elongation at break, %, approx…………………………………   400     410

Packaging:  HCR 135U is delivered in 20 kg carton boxes.

Storage and shelf life:  HCR 135U may be stored in its original unopened packaging at a temperature below 40℃ for up to 18 months from the date of manufacture marked clearly on the packaging.

Past this date,  no longer guarantees that the product meets the sales specifications.