Technical data sheets are essential comparison tools when sourcing silicone rubber. Their figures are only useful when you understand the material grade, measurement conditions and intended scope of the data. Here is a structured way to review them.
Check the product identity first
Before comparing any numbers, confirm the manufacturer, exact grade, document title and revision. Similar grade names do not guarantee interchangeable properties. A Certificate of Analysis (CoA), TDS and Safety Data Sheet (SDS) serve different purposes and should not be treated as equivalent documents.
Recognize the commonly reported properties
- Hardness: a measure of resistance to indentation, often expressed using a Shore scale.
- Tensile strength: the stress measured during a specified tensile test.
- Elongation at break: the strain recorded at rupture during a defined test.
- Tear strength: a test-specific measure related to resistance to tear propagation.
- Density or specific gravity: a mass/volume-related property under stated conditions.
- Viscosity and curing information: important for particular material forms and processing routes.
Always read the test method and conditions
Test temperatures, specimen preparation, cure conditions and methods can change the interpretation of reported figures. When comparing two datasheets, check whether their test definitions match. If the method is missing, ask for clarification rather than assuming that the data are directly comparable.
Distinguish typical values from guarantees
A published typical value is not always a purchasing specification limit. If a property is critical to your part, request an agreed specification and suitable acceptance criteria. For regulated or safety-critical applications, confirm which declarations, reports or certificates apply to the exact material grade.
Build a simple material comparison checklist
- Product identity and document revision confirmed
- Required property and units identified
- Test method and relevant processing conditions documented
- Critical application requirements checked
- Trial and inspection plan prepared
The role of production validation
Use datasheet data to narrow the selection, and then verify the finished part in representative production conditions. This is particularly important when the application has unusual chemical exposure, compression, hygiene or other qualification requirements.
Need a current datasheet?
Visit the product catalog to find grade-specific downloads where provided, or submit a document request identifying your target product grade.
