How to Tie Double Shot Molding Payments to Measurable Trial Results

Build Payments Around Verified Mold Milestones

A reliable payment plan for double shot molding should be based on documented trial performance instead of dates alone. A practical 50%-30%-20% T/T structure can be used: pay 50% when the mold order is confirmed, release 30% after T1 samples pass the agreed alignment, dimensional, surface, and stability checks, and pay the final 20% before shipment once the mold and samples have completed full inspection.

Recommended Acceptance Framework

The T1 stage should be the main checkpoint for the intermediate payment. At this point, the buyer and supplier can review whether the mold produces samples that match the approved design and technical requirements. The inspection record should include mold alignment, dimensions, surface appearance, trial stability, and formal sample approval.

Double shot and overmolding projects need additional verification because two molded sections or materials must work together. The acceptance process should therefore confirm section alignment, bonding or fit between materials, repeatability over multiple cycles, and the condition of the resulting samples.

• 50% payment begins mold production after the requirements, drawings, materials, and cavity arrangement are approved.
• 30% payment follows documented T1 sample acceptance, including dimensional, alignment, surface, and trial checks.
• 20% payment is released before shipment after final inspection, sample confirmation, and correction status review.
• Any open modification should be clearly recorded and linked to the next agreed acceptance gate.

Technical Criteria for Double Shot Mold Trials

For the custom plastic injection mold product, the listed steel options include P20, 718H, and 1.2738, with compatibility for ABS, PC, and PP materials. The stated precision tolerance is ±0.02 mm. Depending on the application, the mold can use a single-cavity or multi-cavity design and may receive a polished, textured, or matte finish. Listed mold life ranges from 50,000 to 800,000 shots.

These specifications should not be treated as acceptance results by themselves. They should be checked against the approved drawing, material requirements, and inspection report during the trial process. For double shot tooling, the report should also identify the mold version, cavity configuration, number of trial cycles, sample condition, section alignment, and any required correction.

What the Trial Record Should Contain

A measurable trial record gives both parties a shared basis for releasing payment. It should state whether the mold trial was completed, whether the samples remained stable across the documented cycles, and whether the molded sections aligned correctly. It should also capture dimensional inspection results, surface findings, sample approval, and the status of any mold correction.

The available quality process includes mold trial testing, dimension inspection, surface inspection, and complete checking before shipment. Using these records as contractual evidence makes the payment schedule easier to administer and reduces disagreements over whether a milestone has been achieved.

Payment Stages and Evidence

Relevant Project Experience and Support

Longterm has supplied a double shot overmolding mold to a product brand in France for a consumer electronics shell. The customer reported good alignment and stable trial samples, and described the team as professional and responsive. Results such as these can be attached to the T1 acceptance record when they satisfy the agreed technical criteria.

Longterm also holds ISO 9001:2015 certification covering the design, manufacture, and sale of precision molds and the sale of plastic products. Its services include high-precision custom molds, double shot molds, overmolds, and mold development combined with plastic injection mass production.

Frequently Asked Questions

What should authorize the 30% T1 payment?

The release should follow a documented T1 review confirming that the samples meet the approved requirements. The review should cover mold trial performance, section alignment, dimensions, surface condition, stability, and sample approval.

How are double shot molding results measured?

Measure and record section alignment, sample stability, dimensional results, surface quality, and performance over multiple trial cycles. The listed ±0.02 mm tolerance can also be compared with the approved drawing where applicable.

How should corrections affect payment?

Any unresolved correction should be listed in the acceptance record, with responsibility and completion status clearly identified. Related payment can remain tied to the next acceptance gate. Longterm lists mold modification, maintenance, online technical guidance, and spare parts support among its after-sales services.

Conclusion

A 50%-30%-20% payment arrangement gives double shot molding projects clear financial checkpoints: the first payment starts production, the T1 payment follows measurable sample results, and the final payment depends on full inspection before shipment. To make the agreement effective, retain records for alignment, dimensional accuracy, surface quality, trial stability, and multi-cycle performance. Longterm provides OEM custom plastic injection molds, double shot and overmolding services, and mold development with injection mass production, supported by ISO 9001:2015 certification. For technical solutions or project support, contact Roger Luo at rogerluo@longterm-mold.com.

About Longterm

Longterm Manufacturing Solutions Limited was established in 2010 and serves international customers with mold design, tooling, precision machining, mold manufacturing, and parts production. The company has 50 employees, including 5 R&D engineers focused on molds and precision machining. Its capabilities cover injection mold structural design, precision CNC component development, sample verification, and manufacturing process optimization. Longterm has served customers in several industries and maintains ISO 9001:2015 certification.