Rubber Terms You Can Use in a Drawing, RFQ or Test Plan
This glossary explains common rubber material, process and testing terms in practical purchasing language. Use it to make specifications clearer before asking WeProFab for a material or process recommendation.
Ability of a rubber surface to resist material loss from rubbing or repeated contact. Specify the test condition when wear drives service life.
Permanent deformation remaining after a rubber specimen is compressed for a defined time and temperature. It is especially relevant to seals and cushioning parts.
A formulated rubber mixture containing polymer, fillers, cure system and other ingredients. The polymer name alone does not define the full performance.
The process that forms crosslinks in rubber and turns the uncured compound into an elastic finished material. Cure condition affects hardness and physical properties.
Converting sheet material into gaskets, pads or flat shapes with a cutting tool. It suits two-dimensional parts and can be sensitive to nesting and edge tolerance.
An instrument and scale used to measure rubber hardness. Shore A is common for many flexible rubber parts; the scale and method must be stated.
A polymeric material that can deform and recover. Rubber and silicone families contain many different elastomer types.
The percentage increase in length when a tensile specimen breaks. It is interpreted together with tensile strength, geometry and conditioning.
An elastomer commonly considered for weather, ozone, water and outdoor exposure. It is generally not the first choice for petroleum oil contact.
A continuous process that pushes rubber through a die to create profiles, cords, tubes or strips with a consistent cross-section.
Thin excess material formed at the mold parting line. Trimming and acceptable flash limits should be agreed for molded parts.
Resistance to indentation, commonly reported using a Shore scale. Hardness affects feel and deformation but does not replace tensile or aging data.
Hydrogenated nitrile rubber, considered when oil resistance is needed with improved heat and aging performance compared with standard NBR.
Shaping rubber in a mold by compression, transfer or injection. Part geometry, quantity, compound and tolerance influence the process choice.
An elastomer commonly used for resistance to oils and fuels. Performance depends on formulation, temperature and the exact fluid.
Ability to resist cracking caused by ozone exposure, especially when rubber is strained. Outdoor sealing applications often consider this risk.
A curing system used with certain elastomers to support heat resistance or cleanliness requirements. It changes processing and final properties.
A measure of energy return after deformation. It can matter in vibration, impact and dynamic applications.
A process that bonds rubber to a prepared metal insert during molding. Surface preparation and bond validation are critical.
A common hardness scale for flexible rubber. Very soft or very hard materials may require another scale or method.
An elastomer family known for broad temperature capability and color flexibility. Mechanical strength and fluid resistance still require application review.
Density relative to water. It can support material consistency checks and weight calculations but does not identify a complete formulation.
Resistance to the growth of a cut or nick under load. It is relevant to thin edges, membranes and parts handled during assembly.
Maximum tensile stress reached before failure under a defined test method. It should be reviewed with elongation and conditioning.
The permitted dimensional variation. Tight tolerances should be applied to features that control fit, sealing or function.
Cross-section details decide how an extrusion fits
For an extruded profile, include the cross-section drawing, critical dimensions, corner radii, wall thickness, length, splice requirement and installation direction.
- Solid, sponge or co-extruded construction
- Cut length, continuous coil or joined frame
- Adhesive backing, flocking or surface treatment
- Compression range and mating gap
Five items that make a rubber term actionable
Material
State the elastomer family or ask for a recommendation based on service.
Property
State hardness, tolerance, strength, set, color or another measurable item.
Condition
State temperature, fluid, load, movement, weather and exposure duration.
Evidence
State the sample, document, report or inspection record needed for approval.
Common specification questions
Use material names as a starting point, not the full specification
EPDM, NBR, neoprene and silicone describe broad material directions. Your application still needs hardness, service environment, physical-property targets, color, finish and evidence requirements.
Attach the drawing and describe what the part must resist, seal, cushion or protect. WeProFab can then review the material and process direction in context.
