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Xiamen The Answers Trade Co.,Ltd.

HomeNewsCustomized EPDM NBR Rubber Bellows Expansion Joint

Customized EPDM NBR Rubber Bellows Expansion Joint


Customized EPDM NBR Rubber Bellows Expansion Joint

Rubber Bellows Expansion Joint are used as a cover or expansion joint to protect device or machines, which are made by rubber compression molding, rubber injection mold or extrusion tool.
Rubber Expansion Bellows are designed as a cover mainly protect against dust, water, oil, grease, acids, bleaches, spatter or other environment elements.

Rubber Bellows Expansion Joint-Main Structions and Shapes

Straight Convolution Rubber Bellows
Spiral Convolution Rubber Bellows
Concentric Rubber Bellows
Tapered Rubber Bellows
Metal+Rubber Overmold Bellows
Rubber Bellows with Clamping, Hole & Lock

Rubber Bellows Expansion Joint-Materials Ddoption
Material Abbreviation Temperature Range
(dry heat)
Aging Weathering
Oil& Grease
Water Swell Resistance Flex-Fatigue Economy of
Material Notes

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
Fluorocarbon FKM 5F to 390F Very Good Very Good Good Average Poor Rubber King,
Widely Applications

Rubber Bellows Expansion Joint-Design Guide (5 factors considered)
Direction of Travel Required straight-line motion
articulating motion
Length of Travel Required small delta between peak and valley of convolutes
large delta between peak and valley of convolutes
Interface between Rubber Bellows Ends and Mating Components An extended straight section with a hose clamp
A locking grommet securing the bellows into a panel or sheet metal
An integrated flange with mounting holes
Completely enclosed bellows ends for protecting parts going up and down
Outside Constraints Tapered rubber bellows for tapered mechanisms
Straight rubber bellows (cylindrical rubber bellows) for components with external space constraints.
Other bellows with different convolutions
Working Environment Important for materials adoption

Rubber Bellows Expansion Joint-Some Typical Applications:
Expansion joints
Rod & Ball screw covers
Piping penetration seals
Fan duct connections
Compressor and engine intake and exhaust manifold connections
Insulating sleeve
Custom Rubber Bellows Expansion Joint Requirements:
1. Offer 2D, 3D design drawings or samples, and also tell us your sizes telorance demands.
2. Bellows Materials Demands: Rubber, Silicone, EPDM, Nitrile, etc, or tell us operating environments, functions etc.
3. Durometer Demands (Hardness Shore A):
4.. Silicone Bellows Surface Demand
5. Working Environmment Demands
6.Silicon Bellows Flashing Demands etc.
(Note: Different Silicone Rubber Bellows durometer demands, surface demands, parting lines demands or rubber flashing demands have different production difficulty and production cost. Epecially for mold-making technology demands, compression mold steel choice, mold maintain when mass production etc.)

Xiamen The Answers Trade Co.,Ltd.
Business Type:Manufacturer
Product Range:Digital Watches , Household Rubber , Moulds
Products/Service:silicone rubber compression molding , Medical Appliance Silicone Rubber Parts , Electronics Silicone Rubber Parts , plastic injection molding , Liquid Silicone Rubber Injection Mold , Automotive Silicone Rubber Parts
Certificate:FSC , CE , FDA , ISO/TS16949
Company Address:NO.37, Phase 3 Xiangluhuacheng,Changhaoerli,Huli District, Xiamen, Fujian, China

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