Denomination

Control sample

Samples

1

2

3

4

5

Polymethylsiloxane rubber

100

100

100

100

100

100

Silica filler

25

25

25

25

25

25

Chromium oxide Cr2О3

-

1

2

3

5

10

PENTA-21P per 100 mass

5

5

5

5

5

5

Cure time, h

24

24

24

24

24

24

Conditional strength (f0), MPa

2.3

2.4

2.3

2.2

2.0

1.9

Relative extension (ε0), %

95

110

105

100

95

90

Shore A hardness (HSh0)

45

48

48

52

55

55

After thermal aging after the regime 250˚C and 72 h

Conditional strength (f1), MPa

1.4

1.8

2.1

2.1

1.8

1.7

Changes (Δf), %

−39.1

−25.0

−8.7

−4.5

−10.0

−10.5

Relative extension (ε1), %

70

85

90

90

85

75

Changes (Δε), %

−26.3

−22.7

−14.3

−10.0

−10.5

−16.7

Shore A hardness (HSh1)

65

62

59

58

60

59

Changes (ΔHSh), %

+30.8

+29.2

+22.9

+11.5

+9.1

+7.3