NBR Rubber Expansion Bellows

NBR Rubber Expansion Bellows, also known as Buna n Rubber Expansion Bellows &  Nitrile Rubber 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.

NBR Rubber  Expansion Bellows are produced by silicone rubber compression molding, extrusion moulding or rubber injection moulding.

NBR Rubber   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^oC-110^oC. (Short-period working: 120^oC)
4. Good air tightness
5. Strong Adhesion

NBR Rubber   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

NBR Rubber   Expansion  Bellows Main Struction and Shape

Straight Convolution  NBR Rubber  Expansion  Bellows

Tapered  NBR Rubber   Expansion  Bellows

Metal +  NBR Rubber  Expansion  Overmolded  Bellows

NBR Rubber   Expansion  Bellows with Clamp & Locks

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