HEAT CURED SILICONE RUBBER IOTA HCR 135U
Description：IOTA 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: IOTA HCR 135U is delivered in 20 kg carton boxes.
Storage
and shelf life: IOTA 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, IOTA no longer guarantees that the product meets the sales
specifications.
