Silicone Rubber Compression Molding Service

Z.S.R Group is your source for high-quality, molded custom silicone parts that transform your product drawing into vital components in today’s high-tech industrial devices. We offer our partner in industrial, consumer, commercial, to medical by high-quality custom HTV silicone rubber compression molding with our 38 sets machines.

Z.S.R silicone compression molding Capacities

Z.S.R. offers two types of custom silicone compression molding: HCR Silicone compression Molding and Silicone rubber overmolding, with different materials (Silicone, Metal, plastic, etc.). While both processes are great options your part geometry and complexity will likely determine which process to use.

  • silicone fuel filler neck gaskets manufacturer

silicone compression molding

  • silicone door weatherstrips molding factory

silicone over-molding

  • silicone fuel line gaskets manufacturing

Multi-Shot insert molding

Tooling

Prototype Tooling: 10-50pcs;
Production Tooling: over 3.000 pcs

Materials

HTV Standard Silicone Rubber
Medical-Grade Silicone
Optical-Grade Silicone
Fluorosilicone (fuel and oil resistant)

Machines

Single, multi. cavity, and family molds: 50 to 300 press tonnage, side actions including handloaded

Precision Tolerances

±0.0128 mm machining tolerance with ±0.05 mm shrink rate control.

Part-to-Part Repeatability

2-20 mm

Parts size

1mm-650mm

After your files are received, we’ll review them to identify and communicate any potential Design for Manufacturability (DFM) Feedback to save money through the manufacturing process.

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The Process of Silicone Compression Molding

Silicone compression molding is a manufacturing process that uses heat and pressure to shape unvulcanized silicone (often raw rubber or gum) into a mold cavity. A measured, pre-vulcanized amount of block silicone rubber material is placed into an open, heated mold, which is then closed, forcing the silicone to fill the cavity and cure (vulcanize) into a finished part. After the removal of the item from the mold, the post-molding process may include de-flashing, post-curing, inspection, and packaging. Finally, the finished molded silicone products are packaged for transportation and sales.

  • Manual Cutting: The rubber compound is cut to the required weight.
  • Loading into Cavity: The compound is placed—either manually or mechanically—into a preheated mold (typically 150–180°C).
  • Mold Closing and Pressurization: The mold closes and applies pressure, forcing the compound to fill the mold cavity.
  • Vulcanization and Molding: Cross-linking occurs via peroxide or platinum-based systems; the vulcanization time is relatively long (2–10 minutes).
  • Demolding and Trimming: After opening the mold, the finished part is removed; flash (excess material) often requires trimming.

Where Are Silicone compression molding Parts Used?

Due to silicone’s unique set of properties, it has become one of the most popular elastic materials and you can find examples of custom silicone rubber compression molding across many industries. Here are some industries where silicone compression molding is used:

  • medical equipment

Medical Industry

Catheters Implantable cartridge
O-rings, Gaskets and Plugs
Storage devices

  • automotive manufacturing

Automotive Industry

Valve Membranes
O-rings and gaskets
Vibration dampeners

  • food storage boxes

Food/Appliance Industry

Silicone baking dishes
Flexible ice cube trays
Baby bottle nipples

  • electronics and electrical appliances industry

Electronics Industry

Cell phone cases
Gaskets and dampeners
Tactile buttons

Materials & Specifications

Choose the right material for your application. We support custom material selection based on performance, regulatory, and budget requirements.

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  • compression molding feeding material

HTV Standard Silicone Rubber

20,30, 40, 50, 60, 70 and 80 durometers

Medical-Grade Silicone

FDA / ISO 10993 compliant

Optical-Grade Silicone

High transparency, UV stable

Fluorosilicone

Fuel and oil resistant

Available Mold Types

Steel (tool steel, carbon steel) and aluminum molds. Production grades range from Class S50C (prototype) to S136 (extremely high production). Single, multi-cavity, and family molds with side actions including hand-loaded. Tighter tolerances can be requested and may increase tooling cost due to additional sampling. Z.S.R mills to a steel-safe condition on critical features.

Ready to Start Your LSR Project?

Yes. Send STEP, IGES, PDF, CAD, STP, STEP, or X-T files. We’ll review tolerances and suggest the best gating and venting strategy.

Parts can be delivered in 7–15 days. Tooling lead time starts at 15 business days. Prototype tooling is typically faster, while production tooling depends on complexity.

We offer single, multi-cavity, and family molds. Up to 6 colors can be used in one product. Our presses range from 50 to 300 tons, with side actions including hand-loaded options.

Compression molding offers lower upfront tooling costs, shorter setup time, and diversity in wall thickness (1.3 mm to 2.54 cm). It produces seamless parts without flow lines, making it ideal for gaskets. It is also suitable for prototype and R&D phases, with good surface finish right out of the mold.

We are certified to ISO 9001:2015, SA8000, and SEDEX 4P. We also support FDA, LFGB, and medical-grade material compliance.