Elastomer Moulding

Your Trusted Partner in Custom Elastomer Moulding Services

Armstrong is an established provider of custom elastomer products. Our in-house R&D team is dedicated to formulating customized formulations with innovative solutions to meet your exact specifications.

With our extensive technical know-how, we are confident in producing quality products that cater to the unique needs of your application. If you’re looking for a partner that can provide reliable elastomer moulding components – look no further than Armstrong.

Our Capabilities

Our elastomer moulding process capabilities include elastomer transfer moulding, compression moulding, hybrid injection moulding, and liquid silicone injection moulding. As for materials, we offer a full range of elastomer materials which include natural and synthetic rubber, and specialized compounds. Depending on the part design and requirement, Armstrong is able to recommend the best moulding methods and elastomer materials that suit your needs.
Moulding Process Capabilities
  • Compression Moulding: Pre-formed elastomer is placed in an open cavity mould, and then compressed under specific temperature and pressure into the final shape.
  • Transfer Moulding: Elastomer is placed in the transfer pot, heated and compressed to transfer the material into a pre-heated closed mould.
  • Hybrid Injection Moulding: Elastomer is injected into the pre-heated closed mould. The upper cavity plate is ejected and the elastomer is compressed to final profile.
  • Liquid Silicone Rubber Injection: Compound is mixed from two separate components and injected via a runner and gate system into a closed mould.
Custom Elastomer Mould Products

Elastomer Selection

The type of elastomer selected is dependent on the intended applications of the end product. In general, it is selected based on its material properties and cost. At times, two or more types of elastomers are blended to offer more competitive pricing or enhanced material properties. Following are some of the common elastomers available in Armstrong.

General purpose elastomers have a relatively lower cost than speciality elastomers, however with poorer resistance to ozone, high temperature, weathering and chemicals.

  • Natural Rubber, NR - Excellent mechanical properties and little heat buildup
  • Styrene-Butadiene Rubber, SBR - Good traction properties and abrasion resistance
  • Polybutadiene Rubber, BR - Best low temperature resistance
  • Polyisoprene Rubber, IR - “Synthetic natural rubber” - replacement of NR, no allergic reactions due to natural proteins and impurities, less odor than NR
  • Ethylene Propylene Rubber, EPDM - Least expensive oil-resistant elastomer, resistant to many hydrocarbons
  • Polybutadiene Rubber, BR - Superior resistance to ozone and weatherability
  • Chloroprene Rubber, CR - “Chlorinated natural rubber” – improve oil, solvent, ozone and heat resistant compared to NR
  • Fluorocarbon Rubber, FKM - High temperature resistant, excellent chemical resistant and fire resistant
  • Urethane Rubber, PUR - Excellent wear and abrasion resistant
  • Silicone Rubber, VMQ - Excellent low and high temperature resistant but poor abrasion property – not suitable for dynamic applications


Armstrong has a team of experts who can guide you through the process of selecting the right elastomer material for your application, or tailor the compound to best suit your requirements. Here are some application examples of the elastomers:
  • NR – Rubber diaphragms
  • SBR – Brake and clutch pads
  • EPDM – Transmission & engine cover seals, sensor seals, steering seals, anti-drain back valves, oil filter seals
  • CR – Vibration mounts, shock absorber seals, breaking & steering system components
  • FKM – Cover seals, sensor seals, oil pan seals, steering system seals
  • VMQ – Cover seals, battery seals, spark plug boots, vibration dampeners
  • NR – Safety shoe soles, isolation dampeners, rubber to metal bonded mounts
  • SBR – Isolation dampeners, plumbing seals & gaskets, general flange gaskets
  • IR – Isolation dampeners, rubber to metal bonded mounts, F&B application seals
  • NBR – Safety shoe soles, sensor seals, oil filter seals
  • EPDM – Washing machine door seals, water system o-rings, HVAC compressor grommets
  • CR – Refrigeration seals, laptop sleeves, anti-vibration mounts, bearing pads, rubber hose
  • FKM – Hydraulic seals, manifold gaskets, firewall seals
  • PUR – Machinery pulleys, wheels, bushings and rollers, hydraulic seals
  • VMQ – Oven door seals
  • IR – Gasket for syringes & IV injection site sets
  • NBR – Patient lift, walking stick ferrule
  • EPDM – Bioreactor seals, autoclaves seals
  • FKM – Sealing/ gasket in fluid handling system
  • PUR – Medical device pulleys, wheels, bushings,  rollers
  • VMQ – Stethoscope earbuds, catheters, wearable products, syringe plungers & tip protectors
  • NR – Shoe soles, toys, hand grip
  • NBR / PUR – Shoe soles
  • EPDM – Hand grips
  • CR – Hand grips, bike shock absorber bushing
  • VMQ – Kitchen tools & utensils, hand grips, earbuds, earplugs, ear hooks, nose pads, keypads, buttons
  • NR / IR – Shock absorber pad
  • EPDM – Printer feed/transport/registration rollers
  • PUR – Printer feed rollers
  • EPDM – Shock absorbing dampeners
  • FKM – Crash stops,  cover seals, gaskets