Beyond price and delivery,what technical questions should buyers ask when evaluating a rubber sheet supplier?Based on our experience,three areas are frequently overlooked—yet they often determine whether a product performs as expected in the field.
1.What hardness tolerance can you hold?
Hardness(measured in Shore A)is one of the most critical parameters for sealing and cushioning applications.But the nominal hardness value alone is not enough.Ask about the tolerance range.A supplier that guarantees±5 Shore A is operating with tighter process control than one that allows±10.For precision applications,this difference can be decisive.
2.How do you test oil resistance and what standard do you follow?
For NBR and other oil‑resistant compounds,the test method matters as much as the result.Many suppliers reference GB/T 5574‑2008 or HG/T 2949‑2023,which specify standard test conditions—for example,immersion in No.3 standard oil at 100°C for 72 hours.Ask your supplier which standard they use and whether they can provide test reports.A supplier that cannot articulate their testing protocol may not have one.
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3.What is your approach to dimensional stability?
Rubber expands and contracts with temperature and can shrink after vulcanisation.For applications where exact dimensions are critical—such as die‑cut gaskets or machine mounting pads—ask about post‑cure handling and whether the material is offered in a“stabilised”condition.Some suppliers perform secondary operations to reduce shrinkage and improve flatness.
These may seem like technical details,but they directly affect product performance and service life.A supplier that can answer these questions confidently—and back up their answers with documentation—is one that takes quality seriously.We recommend including these questions in your supplier evaluation checklist.
Jingdong Rubber Co., Ltd. is a professional rubber sheet manufacturer, producing silicone rubber sheet, natural rubber sheet, fluorine rubber sheet, neoprene rubber sheet, insulating rubber sheet,EPDM rubber sheets, oil-resistant rubber sheets, anti-static rubber sheets, flame-retardant rubber sheets, conductive rubber sheets, anti-slip rubber sheets, and cowshed mats, etc. with over 40 years of industry experience, are popular both at home and abroad. If you need any of our products,please send emails to ventas@jingdongrubber.com.