Sealing & Cushioning Components

A sealing gasket is designed around a contact interface to help control the passage of air, dust, moisture or other substances. A cushioning pad primarily manages contact, spacing, impact or vibration. Some die-cut parts perform both functions, but the material, compression and assembly conditions must support each requirement. The part should be specified by its actual function rather than its shape alone.

Start with the required sealing or cushioning function, installed gap, compression force and operating environment. Foam cell structure and recovery can affect gap filling and sealing suitability. Rubber and silicone grades differ in hardness, compression behavior, temperature resistance and chemical compatibility. Compare grade-specific data rather than assuming one material family is suitable for every application.

Provide the free material thickness, nominal and tolerance-range assembled gap, mating surfaces and available closure force. The selected material must compress sufficiently to maintain the intended contact without creating excessive loading. Compression requirements should be checked against grade-specific force-deflection and recovery data, with the final assembly evaluated under its expected operating conditions.

Die-cut foam, rubber or silicone gaskets can form part of a water- or dust-sealing design when the material, cell structure, joint geometry and compression are suitable. Not every foam grade is appropriate for moisture exposure. A specified IP protection level must be verified through testing of the complete enclosure and cannot be assumed from the gasket material alone.

Compression force indicates the load needed to deform a material by a specified amount, while compression set describes permanent thickness loss after compression and recovery under defined test conditions. Both can influence long-term contact and sealing performance. Compare material data using the relevant test methods, temperature and compression conditions rather than relying on a single published number.

Custom gasket shapes can be evaluated from suitable silicone rubber sheets, including frames, rings, pads and profiles with holes or cutouts. Material grade, thickness, geometry and application requirements must be confirmed before manufacturing. Die cutting flat silicone sheet is different from producing three-dimensional molded silicone components, which require a separate manufacturing process.

Adhesive backing and release liners can be considered for foam gaskets that need controlled placement during assembly. Selection depends on the foam grade, bonding substrate, surface condition, temperature and installation method. Specify the adhesive side, liner arrangement and delivery format. The adhesive may hold the gasket in position, but it does not by itself establish sealing performance.

Achievable tolerances depend on material thickness, softness, elasticity, part geometry, feature spacing and the cutting method. Small holes, narrow sections and flexible materials may require additional review. Identify critical dimensions on the drawing and agree on measurement conditions and acceptance criteria before confirming the manufacturing approach.

Prototype and low-volume requirements can be reviewed before regular production. Samples may help evaluate geometry, installation fit, compression behavior and handling with the intended assembly. Tooling, material availability, minimum quantities and lead time depend on the design and order requirements. Any specified functional sealing tests should be agreed separately from basic dimensional inspection.

Send a drawing or reference sample, drawing revision, dimensions, material and thickness if known, assembled gap, contact surfaces, operating environment and estimated quantity for each design. Identify critical tolerances, adhesive or liner requirements, and any dust, moisture or functional testing targets. If the specification is incomplete, describe the application so the missing information can be reviewed before quotation.