EPDM Flexible Bellows

EPDM Flexible Bellows, also known as EPR Flexible Bellows and ethylene propylene flexible Bellows, are designed as a cover or expansion bellows to take over axial, lateral and angular movements in pipeline systems and protect components against alkalis, strong alkaline, detergent, hot water, steam, ozone, etc.
EPDM Rubber Flexible Bellows and dust boots have wide sealing applications due to these excellent chemical resistance properties and its superior ozone resistance.
EPDM Flexible Bellows are usually produced by silicone rubber compression molding, extrusion moulding or rubber injection moulding.  
 

EPDM Flexible Bellows Advantages:
1.  Anti-ozone and w eather resistance
2.  Aging & Corrosi on  re sistance
3.  Waterproof and steam resistance: bathroom equipment, auto radiator && brake system.

4.  Electrical insulation:  wire & cable 
5.  Good heat resistance (dry heat):  Working Temperature range -50^oC-150^oC. ( -60^oF-300^oF )
6. Low density and high filling property: can be made into low-cost rubber compounds bue to absorption of lots of oils and fillings.

 

EPDM Flexible  Bellows Disadvantages:

1. Slow curing rate

2.  Poor self-adhension and mutual viscosity 

3. Poor processability: difficult to blend with other unsaturated rubbers
4.  Not recommanded  for  petroleum oils, mineral oil, die-ester lubricants or fuel exposure

EPDM Flexible Bellows Main Struction and Shape

Straight Convolution EPDM Flexible Bellows

Tapered EPDM Flexible Bellows

Metal + EPDM Overmolded Flexible  Bellows

EPDM Flexible Bellows with Clamp & Locks

Rubber Flexible 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