Description: FKM premixed rubber is a kind of fluororubber premixed rubber added with asmall amount of processing aids, fillers and all additive of curing systems. Itsolves the
problem that the fluororubber vulcanizing agent is difficult todisperse during processing, and greatly improves the mixing efficiency offluororubber.
Special properties:
Ø Excellent wear & tear resistance; excellent ozone resistance &weather resistance
Ø Heat resistance comparable to silicone rubber, better than any otherrubber; excellent resistance to superheated water or water vapor, excellenthigh vacuum resistance Good appearance.
Ø Excellent corrosion resistance, excellent resistance to moderate dosesof radiation
Ø Good low temperature performance
Ø Good storage stability
Ø Excellent antistatic property in low frequency and low voltage occasions
Ø Calendering, extrusion fast, smooth surface, high strength, highhardness & low pressure deformation, high chemical stability
Main applications:
Ø FKM premix rubber are mainly used in high and low temperature sealing,vacuum instrument equipment, chemical equipment, automobile, aviation and otherfields. It is also one of the indispensable high-performance materials formodern aviation, missiles, rockets, space navigation, ships, atomic energy andother cutting-edge science and technology.
Characteristics:
Type ...............................................................................FKM
Natural color......................................................................translucent
Relative density, g/cm3.......................................................1.85-1.95
Fluorine content....................................................................60±5%
Moisture content, %...............................................................≤0.1
ML 1+4@100℃..............................................................40±5
Volatilecontent................................................................... <1.0%
Color ....................................................................................White
Curing Condition: (1) 1stvulcanization at 175 ℃× 10min
(2) 2nd vulcanization at 230℃×16h.
Reference recipe :(phr)
FKM premixed rubber | 100 |
N990 | 30 |
MgO | 3 |
Ca(OH)2 | 6 |
WS280 | 1 |
Palm wax | 1 |
Product performance:
product name | LXF100CA | LXF200CA |
project | Test Methods | unit | Typical value |
Mooney viscosity(ML 1+4@100℃) | 53 | 48 |
Vulcanization performance test:180℃×5min×1arc |
Minimum torque | ASTM D2048 | lb-in | 0.40 | 0.38 |
Maximum torque | lb-in | 9.02 | 8.46 |
Scorch Time TS2 | s | 72 | 73 |
Positive vulcanization time TC90 | s | 140 | 136 |
1、Mechanical properties 1.1 First vulcanization: 175℃×10min, Second vulcanization: 230℃×16h |
Proportion | ASTM D297 | g/cm3 | 1.938 | 1.936 |
Hardness (Shore A) | ASTM D2240 | Points | 70 | 70 |
Tear strength | ASTM D412 | MPa | 11.28 | 10.58 |
Elongation at break | % | 257 | 248 |
M100 | MPa | 5.45 | 5.40 |
1、 Mechanical properties 1.2 Changes in properties after aging at 200°C for 504 hours |
Hardness (Shore A) change | ASTM D2240 | Points | +3 | +5 |
Change in breaking strength | ASTM D412 | % | -4.2 | -8.0 |
Elongation at break change | ASTM D412 | % | -15.5 | -22.5 |
2、Oil resistance 2.1 Changes in resistance to FAM B oil at 23°C for 48 hours |
Hardness (Shore A) change | ASTM D2240 | Points | -6 | -10 |
Volume change rate change | ASTM D471 | % | +10.5 | +16.5 |
2、Oil resistance 2.2 Performance after aging and drying at 100°C for 48 hours after being resistant to FAM B oil at 23°C for 48 hours |
Hardness (Shore A) | ASTM D2240 | Points | 70 | 70 |
Tear strength | ASTM D412 | % | 10.28 | 9.98 |
Elongation at break | ASTM D412 | % | 245 | 224 |
volume change rate | ASTM D471 | % | +0.23 | +0.52 |
2、Oil resistance 2.3 Diesel resistance change at 23°C for 48 hours |
Hardness (Shore A) change | ASTM D2240 | Points | 0 | -3 |
volume change rate | ASTM D471 | % | -0.03 | +3.98 |
2、Oil resistance 2.4 Performance after aging at 23°C for 48 hours against diesel oil and drying at 100°C for 48 hours |
Hardness (Shore A) | ASTM D2240 | Points | 70 | 69 |
tear strength | ASTM D412 | % | 10.25 | 9.67 |
Elongation at break | ASTM D412 | % | 238 | 228 |
Volume change rate% | ASTM D471 | % | +0.34 | +0.92 |
2、Oil resistance 2.5 Biodiesel resistance (RME) performance at 80°C for 504 hours |
Hardness change (Shore A) | ASTM D2240 | Points | -2 | -4 |
Volume change | ASTM D471 | % | +3.1 | +5.2 |
Tear strength | ASTM D412 | MPa | 8.94 | 7.54 |
Elongation at break | % | 269 | 237 |
2、Oil resistance 2.6 Resistance to 5W/30 engine oil (RME) at 80°C for 504 hours |
Hardness change (Shore A) | ASTM D2240 | Points | -1 | -4 |
Volume change | ASTM D471 | % | +3.52 | +9.62 |
tear strength | ASTM D412 | MPa | 9.05 | 7.24 |
Elongation at break | % | 215 | 189 |
3、Compression set at 150°C for 24 hours (the vulcanization condition of the sample 1st curing at 175°C×10min and 2nd curing at 230°C×16h) |
Compression set | ASTM D395 | % | 26.48 | 23.48 |
4、Ozone resistance 80pphm×20% for elongation×40℃×120 hours |
Cracked or not | ASTM D1171 | / | NO | NO |
5、Low temperature retraction TR10 |
TR10 | GB 7758 | ℃ | -20 | -25 |
Packing: FKM premixed rubber is shippedin 25 kg/cardboard box.
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