A: Neoprene has good oil resistance and self-extinguishing flame properties. EPDM resists weather, ozone and steam well but swells in oil. Use neoprene for moderate oil exposure Use EPDM for pure water, steam or outdoor applications with no oil exposure.

A: Bonded washers can be reused 2-3 times for low pressure or non-critical applications as long as they are not over torqued or visibly damaged. For hydraulic systems operating at high pressure (5000+ psi) or in safety-critical applications, always replace with new washers. The rubber element gets a compression set on the first tightening.

A: Standard neoprene: continuous service -20°C to +100°C. High performance compounds: -40°C to +120°C. EPDM, silicone or FKM (Viton) washers based on chemical compatibility requirements are used for temperatures > +120°C.

A: Neoprene has moderate resistance to petroleum-based oils and fuels — better than natural rubber or EPDM, not as good as NBR (nitrile). NBR bonded sealing washers are the correct material if the application involves continuous oil immersion or high pressure hydraulic oil.

A: Use large OD neoprene fender washers for load distribution on fibreglass. Neoprene’s excellent UV and saltwater resistance makes it the standard choice for marine. Use with A4 (316L) stainless steel bolts to avoid galvanic corrosion.

A: Tighten neoprene washers until the rubber is visibly compressed but not extruded from under the fastener head. Reduce torque by about 30% over metal-to-metal joints. For bonded sealing washers, tighten until the metal washer contacts the mating surface — do not over-torque.

A: No. Neoprene is a good electrical insulator with dielectric strength of 15-20 kV/mm and volume resistivity of 1013-1015 Ω·cm. Ideal for electrical isolation applications such as PCB mounting and switchgear insulation.

A: For sealing applications: Shore A 40–60 (soft, conforms to surface irregularities). General industrial: Shore A 60–70 (best compromise). For load bearing or anti-vibration: Shore A 70-80 (hard, resists compression). Get application-specific recommendations from our engineering team.

A: Standard neoprene—no, unless specially formulated to NSF/ANSI 61 standards. Sinsun provides potable water certified neoprene. For most drinking water applications EPDM is the material of choice because of its excellent water resistance and NSF certification.

A: Yes, this is one of the main advantages of neoprene over natural rubber and NBR. Neoprene is resistant to UV radiation, ozone attack and weathering and is therefore suitable for long term outdoor applications where other rubbers would crack and fail in a few years.

A: Stock sizes (metric M3–M16, imperial #6–5/8″): 7 days. Custom die cut tooling: 10-15 days to fabricate tooling, then production. Custom moulded parts: 20-30 days depending on mould complexity. Waterjet/Laser – No-tooling custom shapes: 7-10 days low volumes.

A: Yeah. All our standard neoprene washers are made from RoHS and REACH compliant materials. Documentation is included with every shipment at no additional cost.

A: YBulk poly bags inside master cartons (10-20 kgs), palletised with IPPC stamps. Electronics applications include anti-static packaging. Long Term Storage Humidity Controlled Barrier Bags. Custom labelling and retail-ready packs available.

A: Yeah. We will send you a free sample of our neoprene washer for your evaluation. Buyer pays international courier shipping charges only. Simply contact our sales team with your size, material grade (neoprene / EPDM / NBR / FKM), durometer hardness and quantity requirements.