Manufacturing Process · 2026-04-15

Custom Rubber Molding: From Sample to Production in 6 Steps

From a drawing, a sample, or a concept: six steps from inquiry to first shipment. Tooling stays inside our walls.

Multi-cavity steel mold CNC-milled in-house at PB Rubber Indo

Custom rubber molding sounds complicated. The process can be reduced to six steps, and at PB Rubber Indo, all of them happen inside our walls at the 10,000 sqm Cikupa facility, from compound mixing through CNC mold cutting through molding through QC.

Step 1: Inquiry and input

You send us one of three things: a 2D PDF or 3D STEP file, a physical sample, or a description of what the part needs to do. Drawings welcome in English, Indonesian, or Japanese (日本語対応).

Step 2: Compound recommendation and quote

Our engineering team identifies the compound family (NBR, EPDM, FKM, silicone, NR, CR, SBR, or a custom blend) based on the fluid, temperature, and service life requirements. Tooling cost and unit price are quoted alongside.

Step 3: Mold design and CNC milling

The mold is designed, then CNC-milled in-house on our mold manufacturing line. Multi-cavity tooling, slide actions, ejector layouts: all designed and cut here. For programs that need an early fit-check, our FDM 3D printer produces a prototype tool fast. Typical tooling lead time is 3 to 6 weeks.

Step 4: Compound mixing

The recommended compound is mixed in-house on our 55-litre or 75-litre internal kneader, finished on a two-roll mill, and rheometer-tested for cure curve before any production run. Compound certificate is retained against the production batch ID.

Step 5: Prototype mold run and validation

A prototype run is shot, typically 10 to 100 parts, for dimensional check on the measuring microscope, hardness verification on a sample slab, and customer sign-off. If something is off, the mold is corrected and the run repeats.

Step 6: Series production

Series runs on the cold runner injection presses (9 units), compression machines (46), hot runner (4), or vacuum molders (3), matched to the part. Final inspection per the QC instruction, packaging, certificate of conformance with the shipment.

What you get end-to-end

  • One factory, one quality system, one accountable contact
  • No third-party tool shop, no third-party bonding step, no shipped intermediate
  • Per-batch compound testing and full QC lab
  • SGS-certified ISO 9001:2015 traceability
  • Trilingual EN/ID/JA correspondence (日本語対応)
  • Reply within one business day on every inquiry

See more on custom molded parts or browse the Rubber Components range. Send your drawing or sample to marketingoem@pbrubberindo.co.id.

Send us your drawing or sample. marketingoem@pbrubberindo.co.id. We reply within one business day, in English, Indonesian, or Japanese (日本語対応).