Short answer:Silicone dynamic seals are prone to high startup friction, stick-slip, and wear. To address these issues, a comprehensive approach is needed that considers contact pressure, surface roughness, speed, lubrication, and material selection—it is not sufficient to rely solely on adding lubricant.
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.
- Reciprocating rods, knobs, valve spools, and sliding seals
- Connectors and Push-to-Connect Assemblies Subject to Frequent Mating and Unmating
- Low-speed startup, intermittent motion, and dry-friction mechanisms
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 type of exercise, speed, range of motion, and number of repetitions
- Verify the medium, temperature, and available lubrication systems
- Define Starting Resistance, Operating Resistance, and Allowable Wear
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.
- Control the compression and contact width to avoid excessive preload
- If the surface roughness of mating surfaces is too high, wear will occur; if it is too low, stick-slip may occur.
- Set the guide to prevent uneven loading and localized scratches
Production and Quality Control
Consistency in mass production results from the combined control of material batches, mold condition, molding windows, and inspection methods.
- The sealing surface must be free of burrs, particles, and scratches.
- Lubrication amounts and application locations must be standardized
- Adhesion and service life of surface coatings or modifications should be verified.
Recommended Verification Items
Validation should be conducted using actual or equivalent operating conditions whenever possible, and functionality should be reconfirmed after aging or cycling.
- Record the startup and operating friction force curves
- Completed life testing under dry and wet conditions, at various temperatures, and with different media
- Check for grinding debris, dimensional loss, leaks, and stick-slip
Frequently Asked Questions
Can silicone oil be used on all silicone seals?
Not necessarily; compatibility, contamination, and regulatory requirements must be taken into account.
Does increasing hardness reduce friction?
It may alter contact deformation, but that does not necessarily mean it reduces friction.
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.