Buying PET Preform and Bumper Moulds from China: A Guide

China has become a major global hub for manufacturing of all kinds of plastic injection moulds, including PET preform and bumper moulds for the automotive industry. Chinese mould makers offer competitive pricing, quick turnaround times and capabilities to produce moulds of excellent quality.

However, dealing with suppliers halfway across the world does come with its fair share of challenges in communication, specifications, quality control, shipping and more. This guide takes you through the key steps involved in successfully procuring PET preform moulds and bumper moulds from China.

Sourcing Reliable Mould Manufacturers

The first and most critical task is finding reputable Chinese companies that specialize in building PET preform moulds and bumper moulds. Here are some tips:

  • Search company directories – Platforms like and Alibaba have directories of thousands of mould makers in China. You can filter by capability, location, credentials and customer reviews.
  • Ask for referrals – Talk to others in your industry who have imported Chinese moulds before. Referrals from peers help validate suppliers.
  • Evaluate portfolios – Shortlist 5-10 suppliers and thoroughly evaluate their websites, product galleries, client testimonials and expertise related to your mould requirements.
  • Check credentials – Choose companies that are ISO-certified and have export trading credentials. These validate quality standards and authenticity of the business.

Providing Design Specifications

The next step is conveying all your design requirements and specifications clearly to the shortlisted Chinese manufacturers. This includes:

Product Design

  • 3D CAD models
  • Product drawings from multiple angles
  • Photos of samples, if available
  • Desired texturing/finish of moulded products
  • Clarity on parting lines


  • Plastic/resin material type (PE, PP, ABS etc.)
  • Melting point range
  • Any specific additives needed in material


  • Cavity counts and layouts
  • Cooling system design
  • Ejection system
  • Standard components vs. custom fabrication


  • Secondary equipment needed (de-flashing, assembly etc.)
  • Packaging requirements

Quality Standards

  • Tolerance grades
  • Testing protocols
  • ISO certifications required

The more detailed your specifications, the better the mould design and quality control from the manufacturer. Provide as much reference material as possible.

Design, Tooling and Manufacturing

With your specifications in hand, the mould maker will proceed with design using advanced 3D modelling software, CNC programming and simulation technology.

Tooling involves precision fabrication of mould bases, cavities, cooling lines and other components. Standard parts are purchased and custom elements are CNC machined in-house. The two mould halves are then assembled and fine-tuned.

Mould manufacturers typically have a strong background in manufacturing PET preform moulds, bumper moulds and similar injection moulding tooling. However, you still need close supervision in the form of:

a) Approving 3D models and toolpaths before mass production

b) Periodic inspection updates with photos/videos as proof

c) Reviewing material and hardness test reports at each stage

Quality Control Checks

While China has advanced quality testing infrastructure, here are some specific QC checks to demand from your PET preform and bumper mould supplier:


  • Verify all critical dimensions on the manufacturing drawings
  • Check for warpage or shrinkage defects


  • External – No flash lines, ejector pin marks or burrs
  • Internal – Surface finish and polish


  • Test mould fitting and alignment on a press
  • Check ease and precision of part demoulding


  • Leak tests under maximum pressure and temperature
  • Validate cooling efficiency with long production runs
  • Validate part quality through sample moulded pieces


  • Material certs for steel types used
  • Heat treatment records per steel grade
  • ISO testing and quality certificates

Being flexible on delivery timelines but strict on QC protocols ensures you receive defect-free moulds.

Safe Shipping

China uses vast container shipment networks for economical shipping globally. From the mould factory, your PET preform and bumper moulds are first packed into secure crates using waterproof materials. Then they are loaded into containers and shipped overseas to your closest freight port.

To prevent damage in transit, ensure:

  • Pressure sensors confirm proper internal environment
  • Anti-rust coatings prevent corrosion
  • Silica gel absorbs condensation
  • Locking pins avoid external impact

The moulds take 30-45 days to ship from China depending on logistics. Sea freight helps lower costs by upto 60% over air shipping.

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Sourcing PET preform moulds and bumper moulds from China successfully depends on selecting reputable suppliers, conveying clear specifications, enforcing stringent quality control and using secure shipping. Follow this guide and you can build strong partnerships with Chinese manufacturers for all your mould needs.

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