HEAT
CURED SILICONE RUBBER IOTA HCR 1960 U
Description:
IOTA HCR 1960 U is a silicone master-batch, heat
curing after the addition of a vulcanizing agent (chosen according to the
processing method).
Applications:
IOTA HCR 1960 U is recommended for moulding, has
good compromise of mechanical properties.
Special
properties:
Good mechanical properties;
Good
appearance, anti-yellowing;
Good
heat stability, up to 200°C;
Not
easy to structured after long-term storage;
No
post curing or slight post curing;
Wide possibilities for blending with other master batch.
Characteristics:
Type
(in accordance with GB/T 5576-1997) …………………………………… VMQ
Density
at 25°C,
g/cm3, approx…………………………………………………… 1.18
Natural
color……………………………………………………………………… translucent
Properties
after working:
1) After addition of 1.25% Di(2,4-dichlorobenzoyl)
peroxide (at 50%), and vulcanization for 8 minutes at 115℃
2) After addition of 1.1%
2,5-dimethyl-2,5-di(tert-butylperoxy)hexane (at 45%), and vulcanization for 5
minutes at 175℃
1.Mechanical property:
1.1 Before post-cure 1) 2)
Shore
A hardness, approx…………………………………………………… 62 60
Tensile
strength, MPa, approx………………………………………………
8.4 9.0
Elongation at break, %, approx……………………………………………. 392
471
Modulus at 100% elongation, MPa, approx……………………………. 2.10 1.85
Tear strength, (ASTM D 624 Die B) kN/m, approx………………….…… 16
17
Rebound resilience, %, approx……………………………………………
51 47
Linear
shrinkage, %, approx…………………………………………………
1.4 3.4
1.2 Properties
after post-cure for 4 hours at 200°C
Shore
A hardness, approx………………………………………………… 61 62
Tensile strength, MPa, approx…………………………………………. …. 9.1 9.3
Elongation at break, %, approx………………………………………….… 352
411
Modulus at 100% elongation, MPa, approx……………………….….… 2.32
2.06
Tear strength (ASTM D 624 Die B)，kN/m,
approx…………….….….… 14 17
Compression set , (22 h/177℃/25%)
%, approx…………….….….……… - 22
Rebound
resilience, %, approx……………………………………….………
47 46
Linear
shrinkage, %, approx…………………………………………………
2.0 3.8
2. Thermal stability
Properties
after post-cure for 3 days at 225°C
Shore A hardness, approx……………………………………………………
62 62
Tensile strength, MPa, approx…………………………………………….. 7.3 .5
Elongation at break, %, approx…………………………………………… 280
296
Packaging:
IOTA HCR 1960 U is delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 1960 U may be stored in its
original unopened packaging at a temperature below 40°C for up to 12 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.
