Short answer:Foamed silicone strips have low compression force and are suitable for larger gaps and lightweight housings; solid silicone strips offer higher strength and wear resistance and are suitable for stable grooves and higher contact pressures. Selection should be based on compression force, closed-cell content, rebound, and waterproofing requirements.
In what kinds of situations are these silicone parts suitable?
Clearly defining the actual application scenarios helps translate material, structural, and validation requirements into actionable technical specifications.
- Sealing of Cabinet Door Frames, Light Fixtures, and Large Enclosures
- Ovens, Rail Transit, and New Energy Equipment
- Insulation, cushioning, dust protection, and a low-force closing mechanism
Parameters to Confirm Before Selecting a Model
We recommend providing the following information before requesting a quote or ordering a sample to minimize the need for repeated prototyping and misunderstandings regarding specifications.
- Specify the clearance range, compression, and door-closing force limits
- Confirm open-cell or closed-cell structure, density, and water absorption requirements
- Select a formulation based on temperature, flame retardancy, and outdoor conditions
Key Points in Structural Design
Structural dimensions, assembly relationships, and material elasticity must be evaluated together; simply increasing a single parameter generally does not directly improve reliability.
- Foam strips should be protected from excessive compression, which can cause permanent collapse of the cells.
- Solid-bar grooves require controlled extrusion and elongation during installation
- Joints, corners, and areas with adhesive backing are key areas for continuous sealing.
Production and Quality Control
Consistency in mass production results from the combined control of material batches, mold condition, molding windows, and inspection methods.
- Controlling Cross-Section Dimensions, Density, and Pore Uniformity
- The strength and appearance of bonded joints must be verified.
- The adhesive backing and substrate should undergo peel and aging tests.
Recommended Verification Items
Validation should be conducted using actual or equivalent operating conditions whenever possible, and functionality should be reconfirmed after aging or cycling.
- Measuring the Compression-Displacement Curve and Compression Recovery
- Conduct water absorption, dust resistance, rain exposure, or airtightness tests
- Retesting after thermal aging, damp heat, and cyclic door opening and closing
Frequently Asked Questions
Can foam strips provide IP67 waterproofing?
Some closed-cell materials and structures can be implemented, but this must be verified through joint testing, compression testing, and full-unit testing.
Is a lower density better for foam strips?
No. Too low a density can result in insufficient strength, resilience, and durability.
How do I provide information to suppliers?
Please provide 2D or 3D drawings, photos of samples, material and hardness specifications, operating environment, target quantity, acceptance criteria, and a list of compliance documents. Based on this information, Chengxin Silicone Rubber can evaluate the materials, molds, molding process, and validation plan.