Double Shot Molding: What Adds to the Cost of Each Part?

The extra cost per part for double shot molding depends on how the project is designed and how many parts are made. Cost contributors can include the two-color mold, the selected hard-and-soft material pairing, mold trials, dimensional checks, and production planning. Available specifications do not state a standard surcharge, so the actual price must be calculated for each project.

How Production Volume Affects Cost

Tooling is a major part of the cost calculation. A larger production run can spread the mold investment across more parts, while a short run may assign a greater share of that investment to each unit. The listed mold service life is up to 800,000 shots, but this is not a per-part amortization rate or a guarantee of a particular unit price.

Double shot molding uses two injection stages within one mold structure. The listed capabilities include high-precision alignment and optional multi-cavity construction. These design choices, along with product geometry, can affect mold complexity and the cost allocated to each finished part.

Key Cost Factors

Materials, Validation, and Applications

The stated mold steel is 718H / 1.2738. Compatible material pairings include ABS+TPU and PP+TPE, allowing combinations of hard and soft plastics. The appropriate choice depends on the part design and project requirements; material pricing and production cycle times are not provided in the available data.

Quality activities include mold trials, dimensional testing, and pre-shipment inspection. The stated production process calls for sample approval before mass production, with the mass-production quantity negotiable. These steps are relevant when comparing the full project cost with other molding processes.

Longterm Mold reports completing a double shot overmolding mold project for a French product brand, involving a consumer electronics shell. The trial samples were reported to have good alignment and stability. This example demonstrates project experience, but does not disclose a per-part price. Double shot molding is also applicable to home appliance components and other plastic products.

Frequently Asked Questions

Is double shot molding always more expensive per part?

No fixed price comparison is available. The two-color mold structure, material selection, alignment requirements, cavity plan, and inspection scope all affect the project estimate. A quote should be based on the specific part and production plan.

What information is needed for a project quotation?

Provide the product geometry, hard-and-soft material combination, mold and cavity requirements, expected production quantity, inspection needs, and whether mass production will follow sample approval.

Can higher volume lower the tooling share per part?

Generally, a larger order can distribute the mold investment across more parts. The listed service life is up to 800,000 shots, but no specific amortization calculation or unit-cost reduction is stated.

Getting a Project-Specific Estimate

When budgeting for double shot molding, account for the two-color tooling, material pairing, mold alignment and cavity configuration, trials, inspection, and production volume. Since no standard per-part surcharge is provided, request a quotation using the part design, materials, target quantity, and sample-approval requirements. Longterm supports custom mold making with injection molding, as well as mold development followed by plastic injection mass production. For technical solutions or project support, contact rogerluo@longterm-mold.com.

About Longterm Mold

Longterm Manufacturing Solutions Limited, operating as Longterm Mold, was founded in 2010 and serves international customers with mold design, tooling, precision machining, mold manufacturing, and parts production. The company has 50 employees and operates a 2,000sqm factory. Its R&D engineers work on injection mold structural design, precision CNC component solutions, sample verification, and process optimization. Longterm holds ISO 9001:2015 certification covering the design, manufacturing, and sales of precision molds and the sales of plastic products, and has served clients across multiple industries.