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Custom Tooling & Mould Design

We design and build the mould for your part rather than passing the job to a third-party toolmaker — which is why tooling cost is refundable against volume production.

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Components produced from tools designed and built in-house

Custom Tooling & Mould Design - custom moulded component, view 1 of 4
Custom Tooling & Mould Design - custom moulded component, view 2 of 4
Custom Tooling & Mould Design - custom moulded component, view 3 of 4
Custom Tooling & Mould Design - custom moulded component, view 4 of 4

Overview

Tooling is where a component programme is won or lost. The mould design fixes the sealing face geometry, the flash line position, the shrinkage compensation, the draft angles and the tolerances the part can actually hold. Because we design tooling in-house, we can adjust the design around your requirements rather than around a toolmaker's standard practice — and because we are not passing through a third party's margin, we can refund the tooling cost against volume production.

The Problem This Solves

The commercial problem with tooling is that the customer pays for it before knowing whether the design works. That asymmetry is bad for both sides: the customer carries all the risk, and the supplier has no incentive to challenge a design that is easy to quote. Our model addresses it directly — prototype first where risk is high, refund the tooling cost against volume, and state the refund threshold in the quotation rather than leaving it vague.

What the Mould Design Decides

Design decisionConsequence
Gland and sealing-face geometryWhether the part seals at the intended compression
Flash line positionWhether a seam crosses the sealing face or lands on a cosmetic surface
Shrinkage compensationWhether dimensions land in tolerance for the chosen compound
Draft anglesDemoulding difficulty, mould wear and part cost
Split line and undercut handlingTool complexity and where marks appear on the part
Gate and vent placementFill quality, trapped air and knit-line strength

The Tooling Process

  1. Drawing review and manufacturability comments — before any tooling commitment
  2. Mould design proposal, including where the flash line and split line will fall
  3. Tooling quotation with the part price stated by volume band
  4. Mould manufacture in-house
  5. First-article samples with inspection data for your fit and function testing
  6. Design adjustments if the sample review requires them
  7. Production, with the tool maintained under our control

Tooling Cost and Refund Model

Ownership and access. Tooling used to produce your parts is maintained by us and is not shared with other customers. Drawings and tooling records are held confidentially and are not disclosed to third parties. Where a customer requires tooling transfer, this is discussed and agreed in writing before the project starts.

Frequently Asked Questions

How much does tooling cost?

It depends on part size, geometry, the number of cavities and the process. It is quoted per project and stated separately from the part price.

What does "tooling refundable against volume" actually mean?

The tooling cost is credited back against production once your cumulative volume passes the threshold stated in your quotation. The exact terms are written into the quote, not implied.

Who owns the tool?

We maintain the tool and it is not shared with other customers. Where a customer requires tooling transfer, we agree the terms in writing before the project begins.

Can you modify an existing tool?

Often yes, where the change is within the tool's structure. Send photographs and dimensions of the current part and we will confirm whether modification or a new tool is the better answer.

How long does tooling take?

It depends on mould complexity and current capacity, and it is quoted per project with a dated commitment rather than an open-ended estimate.

What happens if the first sample is not right?

Design adjustments are made and re-sampled before production. This is exactly the stage the tooling process exists to protect, which is why first-article approval is a required step.

Related Pages

Zhengao Electronics — Custom Silicone & Rubber Engineering Partner. Dongguan, Guangdong, China. ISO 9001:2015. cuckoo@silicon-rubbers.com
Published: September 2026 · Last updated: 30 September 2026

Discuss this with an engineer

Send the drawing, the service environment and the annual volume. We will come back with material options, tooling scope and volume pricing.

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Prefer email? cuckoo@silicon-rubbers.com