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 |