High Temperature Grade: HT40 – 70RP
High temperature silicone rubber applications
These grades of silicone rubber have been specially developed, enabling them to be used at elevated temperatures of up to 300°C. The performance of this grade under high temperatures mean they are suitable for use in a range of applications, including ovens and autoclaves where silicone rubber is commonly used for door seals, lighting,
They work within a large temperature range to provide good resistance and elasticity, and more particularly at very high temperatures.
Characteristics after vulcanisation and postcure (16 h at 250°C Heat Resistance)
Resistance to oil and Boiling Water
Characteristics after vulcanisation and postcure (16 h at 250°C)
·
Shore A hardness(points) approx. |
40 |
50 |
60 |
70 |
·
Break Strength (kg/cm2) or (Mpa x 10)approx. |
60 |
75 |
85 |
80 |
·
Elongation at break, % approx. |
420 |
400 |
350 |
300 |
·
Tear strength, KN/m, approx. |
10 |
18 |
20 |
18 |
·
Elasticity modulus at 100% elongation, Mpa, approx. |
6 |
11 |
15 |
18 |
·
CS (70 h/150°C/25% (%) approx. |
24 |
27 |
28 |
33 |
·
Resilience (Zwick) % approx. |
44 |
40 |
36 |
35 |
·
Brittle Point, °C approx. |
-80 |
-80 |
-80 |
-80 |
·
Linear Shrinkage (%) approx. |
3.3 |
3.3 |
3.3 |
3.3 |
·
Dielectric strength under 2mm (kV/mm) approx. |
16 |
16 |
16 |
16 |
·
Volume Resistivity (W .cm) |
10-16 |
10-16 |
10-16 |
10-16 |
·
Dielectric Constant at (1 MHz), approx. |
2.8 |
2.8 |
2.8 |
2.8 |
·
Power Factor (1MHz), approx. |
2.10-3 |
2.10-3 |
2.10-3 |
2.10-3 |
Thermal ageing at 200 °C
After ageing 500 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
45 53 315 |
58 73 305 |
63 81 285 |
73 81 235 |
After ageing 1000 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
46 40 270 |
60 59 270 |
64 67 265 |
75 70 210 |
After ageing 2000 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
47 28 220 |
62 40 190 |
67 43 185 |
78 47 125 |
After ageing 4000 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
51 27 190 |
65 43 170 |
70 39 125 |
80 39 75 |
After ageing 7000 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
54 25 155 |
68 36 135 |
72 38 115 |
– – – |
Thermal ageing at 250 °C
Properties |
HT40RP |
HT50RP |
HT60RP |
HT70RP |
After ageing 16 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
40 60 420 |
50 75 400 |
60 85 350 |
73 81 300 |
After ageing 500 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
47 43 265 |
63 60 225 |
70 62 200 |
80 57 120 |
After ageing 1000 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
54 41 230 |
70 56 190 |
75 56 160 |
86 48 75 |
After ageing 2000 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
57 42 190 |
73 50 125 |
80 42 90 |
88 45 50 |
After ageing 3000 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
57 42 190 |
73 50 125 |
80 42 90 |
88 45 50 |
After ageing 4000 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
71 46 145 |
87 50 70 |
– – – |
– – – |
After ageing 6000 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
76 51 110 |
– – – |
– – – |
– – – |
Thermal ageing at 300 °C
Properties |
HT40RP |
HT50RP |
HT60RP |
HT70RP |
After ageing 200 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
50 45 250 |
65 60 225 |
80 55 140 |
85 60 100 |
After ageing 400 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
60 45 190 |
75 55 150 |
– – <100 |
– – <100 |
After ageing 600 hShore A Hardness (points) Break strength (kg/cm 2) Elongation (%) |
75 45 140 |
– – <100 |
– – – |
– – – |
Resistance to oil and Boiling Water
CHANGE IN PROPERTIES |
ASTM Oil n° 1 |
Boiling Water |
||
Immersion 70h at 150°C |
Immersion 70h at 100°C |
|||
HT40RP |
HT70RP |
HT40RP |
HT70RP |
|
Shore A Hardness (points), approx.
Swelling (volume) %, approx. |
-6 -8 |
-8 +4 |
+2 +1 |
+1 +1 |