Neoprene Bellows, also known as, CR bellows, neoprene dust cover and neoprene
expansion joints, are designed as a cover or expansion bellows
which have versatile functions as silicone dust boots” or seals,
elastomeric expansion joint, used to seal out dust and other
light-duty environmental factors while allowing a specific stroke
or predetermined range of motion. They are quite common in
industrial and automotive applications.
Neoprene Bellows are usually produced by silicone rubber
compression molding, extrusion moulding or rubber injection
moulding.
Product Specifications
Rubber Bellows Main Material
| Material | Abbreviation | Temperature Range | Aging Weathering, Ozone | Anti-Oil & Grease | Anti Water Swell | Flex-Fatigue | Economy of Material | Material Notes |
| Chloroprene & Neoprene | CR | -40F to 250F | Good | Good | Average | Excellent | Good | Exprosure to refrigerants, can be compounded for FDA applications |
| Nitrile | NBR | -22F to 212F | Poor | Excellent | Good | Good | Excellent | Excellent resistance to petroleum based oils and hydrocarbon fuels |
| Ethylene-Propylene | EPDM EPM | -60F to 300F | Excellent | Poor | Excellent | Good | Excellent | / |
| Silicone | VMQ | -75F to 450F | Excellent | Average | Excellent | Excellent | Average | Medical and aerospace applications |
| Fluorocarbon | FKM | 5F to 390F | Excellent | Excellent | Good | Average | Poor | / |
Product Pictures
Reasons of Rubber Bellows' major defects:
1. Flashing is too big: to solve this problem, we need to pay
attention to 3 points when production; the first one is
mold-design, second one is workers' skill about removing flash, and
the production technology is also very important, if molding
pressure is not enough, will also make the flash hard to be
removed.
2. Mold misalignment & uneven wall: this problem mainly caused by
mold tool, like mold-making precision, misalignment of upper mold
and down mold, datum angle & the 4 located pins are not accurate
enough.
3. Lip cracking: the situation is relative to raw materials
hardness & durometer, products' structure, and die-cutting too
Neoprene Bellows Shape
Neoprene Bellows Properties:
Neoprene also known as choloprene, it is a common material used in
rubber bellow and dust boot applications with many good
performance:
1. Good oil & grease resistance
2. Good Tear Strength, compression & abrasion resistance
3. Excellent Refrigerants / Ammonia performance
4. Temperature Range (dry heat): -40F to 250F
While neoprene has poor cold & fuel resistance, if the rubber
bellows requires good cold & fuel resistance, should use other
material.
Our company advantage for Neoprene Bellows manufacturing process:
1. Precision Own Mold-making Technology since 2004
2. In-depth knowledge of different elastomer rubber materials
molded for rubber bellows, expansion joint & boots
3. Mature experience of flexible silicone rubber bellows quality
controls:
a. Neoprene bellows wall thickness sizes telorance: less 0.05mm
b. mini or less expansion joint flashing
c. mold maintenance in aim to up and down mold plate with
horizontal stripe in exact position
d. good ejected molding to improve silicone bellows production
efficiency
4. Rapid prototyping with full sizes production equipment and
production materials.
5. In-depth knowledge of overmolded metal + silicone rubber bellows
production
