OEM Molded Rubber Bellows Expansion Joints
Product Introduction
Nitrile Expansion Bellows, also known as Nitrile Rubber Expansion Bellows & Nitrile Buna n Expansion Bellows are mainly used as a cover or expansion joint for connecting moving parts and protect inner components against oil, dust, water, grease, acids, bleaches, etc, also called protective cover and expansion joint bellows.
Nitrile Expansion Bellows are produced by silicone rubber compression molding, extrusion moulding or rubber injection moulding.
Product Specifications
Material of each components
| No. | Name | Material |
| 1 | Outer/inner rubber | NR,NBR,EPDM |
| 2 | Key frame | Nylon cord fabric |
| 3 | Pressurized ring | Steel wire strand |
| 4 | Flange | Q235 |
Rubber Bellows Main Materials
| Material | Abbreviation | Temperature Range | Aging Weathering Ozone | Resistance to Oil & Grease | Water Swell Resistance | Flex-Fatigue | Economy of Material | Material Notes |
|
Chloroprene (Neoprene) |
CR | -40F to 250F | Good | Good | Average | Very Good | Good | exposure to refrigerants,can be compounded for FDA applications |
| Nitrile | NBR | -22F to 212F | Poor | Very Good | Good | Good | Very Good | Automotive Applications, Good Oil Proof |
| Ethylence-Propylene | EPDM,EPM | -60F to 300F | Very Good | Poor | Very Good | Good | Very Good | Outside Applications, Good Weather Proof |
| Silicone | VMQ | -75F to 450F | Very Good | Average | Very Good | Very Good | Average | Medical Applications |
| Fluo Rubber | FKM | 5F to 390F | Very Good | Very Good | Good | Average | Poor | Rubber King, Widely Applications |
Product Pictures
Nitrile Expansion Bellows Advantages:
1. Excellent Oil-proof: Excellent oil resistance ranks only second to polysulfide rubber, acrylate and FKM
2. High tensile strength and wear resistance.
3. Good Heat Resistance: Working Temperature ranging -35℃~115℃. (Short-period working: 120℃)
4. Good air tightness
5. Strong Adhesion
Nitrile Expansion Bellows Disadvantages:
1. Poor ozone resistance, against storage
2. Poor electrical property
3. No resistance to aromatic solvents, halogenated hydrocarbon solvents and ketones & esters solvents
4. Low elasticity
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