HEAT CURED SILICONE RUBBER IOTA HCR
2940 U
Description: IOTA HCR 2940 U is
a silicone master-batch, heat curing after the addition of a vulcanizing agent
(chosen according to the processing method).
Applications: IOTA HCR 2940 U is
recommended for buttons, O-rings, gaskets, seals, rubber
rollers and other requirements of high resilience and low compression set of
products.
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;
Major potential for blending with
other master batches.
Characteristics:
Type
(in accordance with GB/T 5576-1997) ……………………………………… VMQ
Density
at 25°C,
g/cm3, approx…………………………………………………… 1.09
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
Before post-cure
Shore A hardness,
approx………………………………………………………40
Tensile strength, MPa,
approx……………………………………………… 5.8
Elongation at break, %, approx……………………………………………. 431
Modulus at 100% elongation, MPa, approx…………………………. 0.84
Tear strength, (ASTM D 624 Die B) kN/m, approx…………………. 9
Rebound resilience, %, approx……………………………………………… 73
Linear shrinkage, %,
approx…………………………………………………… 3.24
1.2 Properties
after post-cure for 4 hours at 200°C
Shore A hardness,
approx………………………………………………… 39
Tensile strength, MPa, approx………………………………………….. 5.9
Elongation at break, %, approx………………………………………… 423
Modulus at 100% elongation, MPa, approx……………………… 0.81
Tear strength (ASTM D 624 Die B)，kN/m,
approx…………… 9
Compression set , (22 h/177℃/25%)
%, approx………………… 14
Rebound resilience, %,
approx…………………………………………… 68
Linear shrinkage, %,
approx………………………………………………… 3.69
2.
Thermal stability
Properties after post-cure for 3
days at 225°C
Shore A hardness, approx……………………………………………
32
Tensile strength, MPa, approx……………………………………..
4.8
Elongation at break, %, approx……………………………………
267
Packaging: IOTA HCR 2940 U is
delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 2940 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.
