Zhong Shen Industrial Co., Ltd.

Question & Answer library

Practical answers for custom injection molding buyers.

Browse focused answers about tooling, sampling, production, quality, and the information needed for an accurate quote.

Subscribe via RSS
  1. Orders & Logistics

    What should an injection molding RFQ include?

    A complete RFQ gets a firm quote in one round instead of three. Six items cover almost everything a molder needs to price tooling and parts.

  2. Orders & Logistics

    Which industries do you manufacture for?

    Fourteen confirmed industries, from consumer goods and housewares to hardware, industrial components, and pet products. Several sectors we deliberately do not serve.

  3. Production & Quality

    What tolerances can you hold?

    We are a general injection molding manufacturer, not a high-precision molder. Commercial tolerances are what we quote against, and we will say so if a drawing needs tighter.

  4. Orders & Logistics

    Will you sign an NDA before I share my design?

    Yes. We sign a mutual NDA on request before reviewing sensitive designs, and we do not produce a customer part for another party.

  5. Orders & Logistics

    What is the difference between OEM and ODM?

    OEM means we manufacture to your design. ODM means we start from an existing or jointly developed design. The distinction matters for tooling, IP, and speed.

  6. Production & Quality

    How do you inspect parts before shipping?

    Inspection runs at four stages — incoming material, in-process sampling, first article, and final outgoing QC against an agreed AQL.

  7. Materials & Finish

    Can you match a specific colour?

    Yes, from a physical sample or a colour reference. Matching is verified against a physical target under agreed lighting, not against a screen or a printed page.

  8. Orders & Logistics

    What files do you need to quote my part?

    A 3D model in STEP or IGES is the working minimum. A drawing, resin, colour, and annual volume turn a provisional quote into a firm one.

  9. Production & Quality

    What is a T1 sample and why does it matter?

    T1 is the first set of parts shot from a new tool. It is a diagnostic checkpoint, not a delivery, and it is the last cheap opportunity to change anything.

  10. Tooling & Cost

    How long does it take to build an injection mold?

    Tool build is the longest single phase of a new program, and it scales with cavitation, complexity, and finish. Approval turnaround is what most often extends it.

  11. Tooling & Cost

    Who owns the mold after I pay for tooling?

    When a customer pays for tooling, the customer owns the tool. It is worth writing that into the purchase order along with what happens at end of life.

  12. Tooling & Cost

    How much does an injection mold cost?

    Tooling is quoted per project, and the price is driven by part size, cavitation, complexity, steel grade, and surface finish rather than by a standard rate.

Email us