Xiamen Better Silicone Rubber Co., Ltd

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We make liquid injection molding and manufacture different kinds of liquid silicone rubber molded parts for medical device, sanitary & bathroom products, electrical products, cosmetics, automotive and machines parts etc. Our team also can offer LSR products parts moldabilities & over-molded manufacturabilities analysis or design support etc.

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E-mail : admin@better-silicone.com
Add: No. 165th, Tong'an Park, Industry Zone, Tona'An District, Xiamen City, China
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Flexible Rubber Bellows

Silicone Bellow Connector, also called as Silicone Hose Connector, Silicone Tube Connector, Rubber Expansion Bellows, Rubber Expansion Joint, Silicone Suction Bellows, Rubber Dust Cover, Bellows Suction Cup, and Flexible & Inflatable Rubber Expansion Bellows, which usually work as a connector, protector, boots, hose and sleeve in medical equipment system, automotive, pumping and industrial usage. Silicone Bellows Connector is longer than common silicone bellows, which is used as a hose connector to connect the resuscitator mask and the resuscitator system, and normally made of medical grade silicone/ liquid silicone by silicone compression molding, transfer molding and liquid silicone injection molding.

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Flexible Rubber Bellow


Flexible Rubber Bellow, also called as Rubber Bellow Connector, Silicone Hose Connector, Silicone Tube Connector, Rubber Expansion Bellows, Rubber Expansion Joint, Silicone Suction BellowsRubber Dust Cover, Bellows Suction Cup, and  Flexible & Inflatable Rubber Expansion Bellows, which usually work as a connector, protector, boots, hose and sleeve in medical equipment system, automotive, pumping and industrial usage. Flexible Rubber Bellow is longer than common silicone bellows, which is used as a hose connector to connect the resuscitator face mask and the resuscitator system, and normally made of medical grade silicone/ liquid silicone by silicone compression molding, transfer molding and liquid silicone injection molding.

flexible rubber bellows

silicone bellow

Flexible Rubber Bellow is normally made by silicone compression molding in solid silicone and rubber material according to different working environment. While silicone bellows by silicone compression molding the wall thickness can not achieve as thin as liquid silicone injection molded. What's more, the wall thickness will have misalignment  issue by compression molding. For liquid silicone bellows, the wall thickness can be 0.4mm without misalignment, with good parting line and without rubber flashings.

silicone bellow connector by LSR Injection Mold

liquid silicone rubber bellows


Flexible Rubber Bellow choose liquid silicone as material mainly because:

1.Thin Wall Thickness and Strict Tolerance

For some special and complicated designs, such as thin wall thickness less than 0.5mm, compression molded silicone bellows will occur misalignment issue, so in this situaion, we will suggest customers to choose liquid injection molding.  And for some Silicone Rubber Bellows there are small holes, and is difficult to demold or will cause rubbler flashing in the holes easily, liquid silicone rubber injection molding is the best chioce to make sure rubber bellows quality.

Silicone Dust Cover liquid silicone rubber molding


2. Material Advantages:

  • Flexible Rubber Bellow made of Liquid Silicone is High Safety: Liquid Silicone Rubber material 100% food grade silicone, clean, plasticizer-free, tasteless, and can resist oxidation and bacteria growth. For Silicone Rubber Bellows that need to contact food and human contact equipment, Liquid Rubber Bellows are the best choice.

  • Flexible Rubber Bellow made of LSR with Wide Hardness Range: LSR can achieve the lowest hardness 5 ShoreA, and highest 80A, which is a good property that compression molded rubber bellows can not achieve, for higher hardness, it's very difficult to demold; and for low hardness, the parting line will broken easily.

flexible silicone bellow cover by Liquid Injection Mold


  • Liquid Silicone Injection Molded Flexible Rubber Bellow is Durable: Liquid Silicone Bellow has better elongation, higher tear and tensile strength, and excellent flexibility.

  • Liquid Injection Molded Silicone Bellow with Wider Temperature Resistant: Liquid Silicone Bellows have large temperature range ( –60°C to +180°C.), can withstand extreme high and low temperatures. For silicone bellows that work in machine environment, liquid silicone is a better choice.


LSR Silicone Rubber Expansion Joint


3. Production Efficiency

  • Flexible Rubber Bellow by Liquid Injection Molding can demold automatically and with no or less rubber flashings, which can save human labor to deal with the rubber flashing manually.

  • Shorter Cycle time, do not need to place material by hand like compression molding, and the curing time is also shorter.

liquid silicone bellow and Rubber Expansion Joint


Compression Molded Silicone Rubber Bellows' Advantages:

Flexible Rubber Bellow by Compression molding is cost economic compared to LSR injection molding. With the development of industry, the tolerance of rubber bellow can achieve at 0.02-0.1mm by using good mold steel material, good located pins, and good mold-making equipment.

Rubber Expansion Bellows for needle tube

Flexible Rubber Bellow can made into different colors and hardness conveniently.

Compression molding is availabe for different kinds of silicone rubber materials according to different working environment. The most common materials include silicone bellows, natural rubber bellows, and EPDM bellows, NBR bellows. Please check different properity for different material bellows:

Rubber Bellows Materials


Flexible Rubber Bellow Production Process:


Silicone Rubber Bellow Manufacture Process by Compression Molding


Liquid Silicone Bellow Manufacturing Process by LSR Injection Mold


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