Metric Brown Green Black O-Ring FKM With Acid Resistant For Aircraft Engines Seals Systems
Before buy this products, we have to know, what is an o-ring?
O-ring is the most popular and simplest seals all over the word now. Why we call them o-rings?
Because their cross section looks like an "O". You can see the drawing as bellow:
Images Show:
FKM O-RINGS:
FKM (fluorocarbon rubber) has excellent resistance to high temperatures, ozone, oxygen, mineral oil, synthetic hydraulic fluids, fuels, aromatics and many organic solvents and chemicals making it a good choice for an o-ring material.
Low temperature resistance is normally not favorable and for static applications is limited to approximately -15 °F (-26 °C). Under dynamic conditions, the lowest service temperature is between 5 °F and 0 °F (-15 °C and -18 °C).
Gas permeability is very low and similar to that of butyl rubber. Special fluorocarbon compounds exhibit an improved resistance to acids, fuels, water and steam.
ASTM D1418 Designation: FKM
ORK Compound Designation: VT
Standard Color: Black, Brown, Green
Description: Combining high temperature resistance with outstanding chemical resistance, Fluorocarbon-based compounds approach the ideal for a universal O-ring material.
Key Use(s): Seals for aircraft engines. Seals for automotive fuel handling systems. High temperature/low compression set applications. Wide chemical exposure situations. Hard vacuum service.
Temperature Range
Standard Compound: -13° to +446°F
Special Compound: -40° to +446°F
Hardness (Shore A): 55 to 90.
Features: High fluorine grades offer higher resistance to swell in high octane and oxygenated fuel blends. This give superior performance in Ethanol/Methanol blended gasoline. Base resistant grades offer improved resistance to amine based oil protectants found in new transmission oils. Also, improved resistant to steam for higher temperature services. Low temperature bases can improve performance to -40°F.
New Polymers being offered have improved chemical resistance and low temperature performance.
FKM Extreme ETP offers similar chemical compatibility as Kalrez with temperature performance with a TR(10) of -40°F and brittleness to -76°.
Limitations: Fluorocarbons (FKMs) are not recommended for exposure to ketones, amines, low molecular weight esters and ethers, nitro hydrocarbons, hot hydrofluoric or chlorosulfonic acids, or Skydrol fluids. They are also not recommended for situations requiring good low temperature flexibility.
FKM O-Ring General Attributes
- Excellent Heat resistance
- Excellent resistance to oils
- Low compression set
- Good fuel resistance
- Excellent ozone and weather resistance
Common Applications for FKM O-Rings
- Engine Oil Seals
- Fuel Systems
- High Temperature Seals
- Petrochemical Systems
Data Sheet of FKM:
| MATERIALS TEST REPORT |
| FKM 70 BLACK COMPOUND |
| ASTM D2000 M2HK 710 A1-10 B38 EO78 EF31 F13 |
| Press Cure | Post Cure |
| Sheet : 10min 170℃ | Sheet : 16 hrs230℃ |
| Button : 10 min 170℃ | Button : 16 hrs 230℃ |
| ORIGINAL PROPERTIES | SPECIFICATION | TEST RESULT | ASTM TEST |
| HARDNESS SHORE A | 70°±5 | 70 | D2240 |
| TENSILE STRENGTH, MPA, MIN | ≥10 | 14.2 | D412 |
| ULTIMATE ELONGATION, ％, | ≥175 | 253.0 | D412 |
| SPECIFIC GRAVITY (g/cm3) | | 1.85 | D297 |
| |
| HEAT RESISTANCE 70 H . AT 250℃(A1-10) | | | D573 |
| CHANGE IN HARDNESS, POINTS | +10 | +6 | |
| CHANGE IN TENSILES STRENGTH, % | -25 | -15.1 | |
| CHANGE IN ULTIMATE ELONGATION,MAX % | -25 | -22 | |
| |
| COMPRESSION SET, MAX, 22H AT 200℃(B38 ) | ≤30 | 25.8 | D395 |
| |
| FLUID RESISTANCE FUEL.101. 70H AT 200℃ (EO78) | | | D471 |
| CHANGE IN HARDNESS, POINTS | -15~+5 | -11 | |
| CHANGE IN TENSILES STRENGTH, MAX % | -40 | -22.3 | |
| CHANGE IN ULTIMATE ELONGATION,MAX % | -20 | -7.2 | |
| CHANGE IN VOLUME % | 0~+15 | +12.9 | |
| |
| FLUID RESISTANCE FUEL C, 70H AT 23℃ (EF31) | | | D471 |
| CHANGE IN HARDNESS, POINTS | ±5 | -3 | |
| CHANGE IN TENSILES STRENGTH, MAX % | -25 | -18.4 | |
| CHANGE IN ULTIMATE ELONGATION,MAX % | -20 | -15.5 | |
| CHANGE IN VOLUME % | 0~+10 | +4.3 | |
| |
| LOW-TEMPERATURE BRITTLENESS NONBRITTLE | | | |
| AFTER 3MIN AT -10°C (F13) | NONBRITTLE | PASS | D2137 |
ORK is a leading supplier of FKM O-rings and custom molded seals. We offer both genuine FKM and standard fluorocarbon materials for general purpose and high performance applications. Selecting the type of FKM that best fits your application is important, but it isn't complicated, and help is available from ORK. We also offer gaskets made out of FKM
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Metric Brown Green Black O-Ring FKM With Acid Resistant For Aircraft Engines Seals Systems Images
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