HEAT
CURED SILICONE RUBBER IOTA HCR 2980 U
Description:
IOTA HCR 2980 U is a silicone master-batch, heat
curing after the addition of a vulcanizing agent (chosen according to the processing method).
Applications:
IOTA HCR 2980 U is recommended for moulding, has
good compromise of mechanical properties.
Special
properties:
High resilience, low compression set;
Good
appearance,anti-yellowing;
Good mechanical properties;
Easy processing, non-stick rollers, easy release;
Not
easy to structured after long-term storage;
Good thermal stability;
Wide possibilities for blending with other master
batch.
Characteristic:
Type
(in accordance with GB/T 5576-1997) ……………………………………… VMQ
Density
at 25°C,
g/cm3, approx……………………………………………………… 1.21
Natural
color…………………………………………………………………… translucent
Properties
after working:
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 Without post-cure
Shore
A hardness, approx………………………………………………………… 77
Tensile
strength, MPa, approx…………………………………………………… 8.1
Elongation at break, %, approx…………………………………………………. 211
Modulus at 100% elongation, MPa, approx…………………………………. 4.12
Tear strength, (ASTM D 624 Die B) kN/m, approx……………………………. 11
Rebound resilience, %, approx…………………………………………………… 51
Linear
shrinkage, %, approx………………………………………………………
3.19
1.2 Properties
after post-cure for 4 hours at 200°C
Shore
A hardness, approx……………………………………………………… 78
Tensile strength, MPa, approx……………………………………………….. 7.5
Elongation at break, %, approx……………………………………………… 192
Modulus at 100% elongation, MPa, approx……………………………… 4.12
Tear strength (ASTM D 624 Die B)，kN/m,
approx………………………… 11
Compression set , (22 h/177℃/25%)
%, approx…………………………… 12
Rebound
resilience, %, approx……………………………………………… 50
Linear
shrinkage, %, approx…………………………………………………… 3.54
2. Thermal stability
Properties
after post-cure for 3 days at 225°C
Shore A hardness, approx…………………………………………………
79
Tensile strength, MPa, approx…………………………………………..
6.2
Elongation at break, %, approx…………………………………………
151
Packaging:
IOTA HCR 2980 U is delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 2980 U may be stored in its
original unopened packaging at a temperature below 40°C for up to 6 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.
