What we make
Rubber moldingCustom rubber molding in China: compression, transfer and injection molded parts in EPDM, NBR, silicone, FKM and neoprene. How the processes differ and what to send for a quote.LSR moldingLiquid silicone rubber (LSR) injection molding for precise, flash-free silicone parts: valves, seals, membranes and overmolded parts. How LSR compares with HCR silicone and what to send for a quote.Gaskets & sealsCustom rubber and silicone gaskets, seals and O-rings — molded or die-cut in EPDM, NBR, silicone and FKM. Gasket types, O-ring standards and what to send for a quote.Rubber-to-metal bondingRubber-to-metal bonded parts and rubber overmolding: anti-vibration mounts, bushings, seals with metal carriers and overmolded handles. Process steps, design notes and quoting.
How RubberSmith works
RubberSmith is the rubber and silicone parts service of Dongguan Huasheng Precision Technology (Huasheng Precision), a CNC machining manufacturer in Dongguan, China. Molding is done at partner factories matched to the material and process. We handle drawing review, material selection questions, quotation, tooling coordination, inspection agreements and shipping — and machine the metal inserts for bonded parts when needed.
| Stage | What we review with you |
|---|---|
| Material | Temperature range, fluids and chemicals, compression set, compliance needs |
| Process | Compression, transfer, injection, LSR or die-cut — matched to quantity and geometry |
| Tooling | Cavities, parting line, flash direction, venting and insert location |
| Production | Hardness and dimensional checks, cosmetic standard, packing |
Common rubber materials at a glance
| Material | Strength | Weak points | Typical uses |
|---|---|---|---|
| Silicone (VMQ) | Very wide temperature range, food and medical grades available | Low tear strength, poor with fuels and oils | Seals, keypads, food and medical parts |
| EPDM | Weather, ozone, water and steam | Swells in oils and fuels | Outdoor seals, HVAC, water systems |
| NBR (nitrile) | Oils and fuels | Poor weather and ozone resistance | O-rings, hydraulic and fuel seals |
| FKM (fluoroelastomer) | High temperature, fuels and chemicals | Higher cost, limited low-temperature flexibility | Engine, chemical and semiconductor seals |
Full comparison: rubber materials — silicone vs EPDM vs NBR vs FKM.
Guides
Rubber materials comparedSilicone vs rubber compared: temperature range, oil and weather resistance, cost and typical uses of silicone (VMQ), EPDM, NBR, FKM, neoprene and natural rubber — with a quick selection table.Durometer chartRubber durometer chart with Shore 00, Shore A and Shore D scales explained, typical hardness of common rubber parts, measurement standards and how to specify hardness tolerance.
How a project runs
- Send drawings and requirements — drawing (PDF) and model (STEP), material and hardness if known, temperature and fluids, quantity.
- Review — we come back with questions on material, tolerances (usually per ISO 3302-1), flash location and inserts.
- Quotation — tooling and piece price quoted separately, plus any testing and documents.
- Samples — first samples checked for hardness, dimensions and appearance before production.
- Production and shipping — packing and shipping confirmed per order.