Caps and Closures Injection Molding RFQ: What Changes Sealing and Torque Quotes

A caps and closures request that only states the resin and quantity leaves out the details that actually change tooling and sealing performance. This guide lists what to send before asking for a caps and closures quote.

Sealing surface and liner assumptions

Whether the closure seals against the bottle directly or relies on a liner changes tolerance requirements and mold finish. State this assumption before the quote is prepared.

• Direct seal versus liner-assisted seal.
• Sealing surface finish and required smoothness.
• Compatibility with the bottle or container thread.

Torque target and thread fit

Torque testing depends on thread geometry, material stiffness and cavity-to-cavity consistency. A target torque range helps the reviewer flag risk before tooling is cut.

• Target application and removal torque range.
• Thread type and pitch specification.
• Whether child-resistant or tamper-evident features are required.

Cavity count and repeatability

Closures are usually produced in multi-cavity molds, so cavity-to-cavity repeatability matters as much as the single-part design. Confirm expected volume so cavity count can be judged against cost and consistency.

• Expected annual and first-order volume.
• Acceptable cavity-to-cavity dimensional variation.
• Inspection plan for torque and fit across cavities.