HCR 180 U is a silicone master batch, vulcanizing under heat after addition of a vulcanizing agent (chosen according to the vulcanizing process).

Details

HEAT CURED SILICONE RUBBER  HCR 180 U

Description： HCR 180 U is a silicone master batch, vulcanizing under heat after addition of a vulcanizing agent (chosen according to the vulcanizing process).

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

Special properties：

Very slight replastification after prolonged storage

Easy to process

No post-cure or slight post-cure

Good mechanical properties

Good heat stability, up to 200℃

Transparency

Wide possibility of reloading and blending

Characteristics：

Type(in accordance with GB/T 5576/1997) ………………………………………… VMQ

Density at 25℃, g/cm3, approx………………………………………………………… 1.21

Natural color…………………………………………………………Colorless, transparent

Properties after working:

(1) After addition of 1.25% 2,4-dichloro-benzoyl 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……………………………….      79         78

Tensile strength, MPa, approx………………………………  10.4       10.8

Elongation at break, %, approx……………………………   230        330

Modulus at 100% elongatioin, MPa, approx ……………… 5.2         3.7

Tear strength, kN/m, approx…………………………………  18         19

Compression set (22h/177oC/25%), %, approx. ……………………  67       60

Rebound resilience, %, approx……………………………… 45        44

1.2 Properties after post-cure for 4 hours at 200℃    

Shore A hardness, approx…………………………………….   81        81

Tensile strength, MPa, approx…………………………………  9.0       9.2

Elongation at break, %, approx……………………………    200       280

Modulus at 100% elongatioin, MPa, approx ……………    5.3       4.0

Tear strength, kN/m, approx…………………………………   19        20

Compression set (22h/177℃/25%), %, approx……………    49       40

Rebound resilience, %, approx………………………………    46      45

2. Heat stability

2.1 Properties after heat-ageing 10 days at 200°C

Shore A hardness, approx……………………………………     87       89

Tensile strength, MPa, approx…………………………………   6.6       6.6

Elongation at break, %, approx………………………………   70       60

Tear strength, kN/m, approx…………………………………    17       16

Rebound resilience, %, approx………………………………    57       59

Packaging:  HCR 180U is delivered in 20 kg carton boxes.

Storage and shelf life:  HCR 180U 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.