Short answer:Tear strength reflects the resistance of silicone rubber to further tearing when it already has a notch or crack. Product lifespan is also affected by thickness, fillet radii, parting line flash, assembly scratches, hardness, and cyclic deformation; therefore, it cannot be determined solely based on the material data sheet.
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.
- Repeated Deformation of Films, Diaphragms, and Valve Components
- Snap Fittings, Pull Tabs, and Assembly Stretch Structures
- Silicone products that may have notches along the edges
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.
- Material Tear Strength, Hardness, and Thickness
- Maximum Tensile Strength, Number of Cycles, and Temperature
- Mold Parting Lines, Trimming, and Assembly Contact Surfaces
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.
- Replace sharp corners with rounded corners and expand the stress transition zone
- Avoid locating hole edges, notches, and burrs in high-stress areas
- Minimize assembly-related stretching and tool scratches
Production and Quality Control
Consistency in mass production results from the combined control of material batches, mold condition, molding windows, and inspection methods.
- Control of mixing, vulcanization, and material batches
- Trimming must not leave any cracks, notches, or jagged edges.
- Prevent sharp parts from coming into contact during shipping
Recommended Verification Items
Validation should be conducted using actual or equivalent operating conditions whenever possible, and functionality should be reconfirmed after aging or cycling.
- Test tear strength in accordance with applicable standards
- Cyclic life testing of the finished product under actual tensile conditions
- Inspection for Crack Propagation After Aging and Exposure to Media
Frequently Asked Questions
Does higher hardness mean higher tear strength?
There is no fixed correspondence; testing should be based on the specific formulation.
Will small burrs affect the tear life?
If located in a stress-concentration zone, it may become a crack initiation point.
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.
