EPDM — The Outdoor & Chemical Workhorse Why EPDM for pipe plugs? Because no other rubber handles water, steam, diluted acids, alkalis, glycol-based coolants, brake fluids, and ozone exposure all at once. Our pipe plug stoppers are compression-molded from 100% virgin EPDM compound with a highly saturated polymer backbone, meaning zero double-bond degradation under UV and atmospheric ozone. No surface cracking after years of outdoor exposure. No swelling in hot water systems. No embrittlement in phosphate ester hydraulic fluids. When your pipe ends face weather, washdown chemicals, or aggressive process fluids, EPDM is the answer, and molds it right.Extreme Temperature Range: -50°C to +150°C From frozen condensate lines in cold storage to saturated steam blowdown at +150°C, these EPDM stoppers maintain interference grip and sealing pressure throughout the full thermal envelope. The material's low glass-transition temperature keeps it pliable in sub-zero conditions — you can install them with bare hands at -40°C and they will still spring back against the pipe wall. At the hot end, EPDM resists softening and compression set far longer than natural rubber or SBR alternatives, ensuring your plug stays put through repeated thermal cycling without losing sealing force.Multiple Sizes, Multiple Profiles — One Custom Source Standard OD range covers from 3 mm to 300 mm, spanning everything from instrument tubing to industrial process lines. We offer solid plug stoppers for maximum burst resistance in pressurized line isolation, hollow core plugs for reduced material weight on large-diameter applications, flanged top stoppers that prevent push-through and provide grip for manual removal, ribbed-body plugs with multi-stage sealing for irregular bore surfaces, and through-hole vented plugs for pressure equalization during curing or painting operations. Custom sizes, stepped diameters, and tapered profiles are all standard capability — simply send your pipe ID and we mold to an exact interference fit.Waterproof. Chemical Resistant. Proven in the Field. Every plug design is validated for specific media resistance at operating temperature. EPDM delivers excellent resistance to water and steam across all rated temperatures, glycol-based coolants and antifreeze, silicone oils and greases, diluted acids and alkalis in the pH 3–11 range, polar solvents including alcohols and ketones, glycol-based brake fluids such as DOT 3 and DOT 4, and continuous ozone, UV, and weather exposure. We will always tell you honestly if your application requires NBR or Viton instead — petroleum oils, fuels, and hydrocarbon solvents are not EPDM's strength, and we would rather recommend the right material than ship the wrong plug.Heavy-Duty Applications Across Every Industry In heavy equipment manufacturing, our plugs protect pipe ends during sandblasting, powder coating, and wet painting — surviving oven cure cycles without deformation. Hydraulic system builders use them to cap open ports and tube ends during transport and storage, preventing contamination ingress that would destroy pump and valve clearances. Chemical processing plants deploy them as permanent end seals on unused manifold ports, sample points, and drain connections exposed to corrosive atmospheres. Automotive production lines rely on them as masking plugs for engine block coolant passages, transmission oil galleries, and brake line fittings during assembly. Marine and offshore operations trust EPDM's unmatched saltwater and UV resistance for seawater cooling system pipe capping and ballast line blanking during dry dock periods. HVAC and plumbing contractors cap refrigerant lines, chilled water pipe ends, and boiler system connections during installation and pressure testing — then remove the plug and torque down the final connection.| Standard or Nonstandard | Customized Nonstandard |
| Size | Customized according to customer drawings |
| Material Type | NR/FKM/EPDM/SILICONE/NBR |
| Color | Customized according to customer drawings |
| Hardness Range | 20-90 Shore A |
| Application | For all industries |
| OEM ODM | Available |
$0.78-0.88 / piece
Q: How long does the mold opening and mass production take?
A: The mold opening cycle is generally 7-15 working days (depending on product complexity). After the mold is confirmed, the mass production cycle is 10-25 working days, which can be shortened for urgent orders with priority arrangement.
Q: Will the mold cost be refundable? What's the standard of mold fee refund?
A: Yes, the mold cost can be fully refunded when your cumulative order quantity reaches the agreed threshold (usually 5000-10000 pieces, subject to product size). The mold will be exclusively reserved for you during the cooperation period.
Q: What silicone rubber materials do you support? Can you meet certification standards?
A: We support food-grade silicone, industrial-grade silicone, high-temperature resistant silicone, conductive silicone, etc. All materials can meet FDA, LFGB, RoHS, REACH.
Q: What payment terms do you accept?
A: We accept T/T (50% deposit before production, 50% balance before shipment), L/C at sight
Q: What shipping methods do you support?
A: Express: DHL, FedEx, UPS, suitable for samples or small orders; Air freight: Suitable for medium orders; Sea freight: Suitable for large orders, can be delivered to the designated port or door-to-door.
