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Precision Sealing Solutions

Sunring Industry Inc. – Your trusted partner in high-precision O-rings, custom molded rubber & plastic parts since 2002. ISO-certified manufacturing with global delivery.

About Sunring Industry

Founded in 2002, Sunring Industry Inc. is a professional manufacturer of rubber seals and precision molded components. With over two decades of experience, we integrate R&D, production, and marketing to deliver high-quality sealing solutions for industries worldwide.

Our commitment to innovation, strict quality control, and customer satisfaction has made us a trusted partner in the automotive, electronics, medical, and instrumentation sectors.

  • ISO-Certified Quality Management
  • 100% Inspection & Advanced Testing Equipment
  • Global Export to 50+ Countries
CNC Workshop Material Mixing Machining Workshop Quality Control

Our Products

From standard O-rings to complex custom molded parts, we offer a wide range of rubber and plastic components engineered for performance and reliability.

Silicone O-Rings

Silicone O-Rings

High-temperature resistant, FDA-compliant seals ideal for medical, food, and aerospace applications.

  • Material: VMQ (Silicone)
  • Standards: ASTM D2000, AS568
  • Hardness: 40–80 Shore A
FKM O-Rings

FKM (Viton®) O-Rings

Excellent chemical and heat resistance. Used in automotive, oil & gas, and industrial systems.

  • Material: FKM (Viton)
  • Temp Range: -20°C to +230°C
  • Standards: ASTM D2000, ISO 3601
NBR O-Rings

NBR (Nitrile) O-Rings

Cost-effective solution for fuel and oil resistance. Widely used in automotive and hydraulics.

  • Material: NBR (Nitrile)
  • Hardness: 50–90 Shore A
  • Standards: AS568, ISO 3601
EPDM O-Rings

EPDM O-Rings

Outstanding weather, ozone, and steam resistance. Ideal for HVAC and outdoor applications.

  • Material: EPDM
  • Temp Range: -50°C to +150°C
  • Standards: ASTM D2000
HNBR O-Rings

HNBR O-Rings

Enhanced heat and oil resistance over NBR. Used in high-performance engines and transmissions.

  • Material: HNBR
  • Hardness: 60–90 Shore A
  • Temp Range: -40°C to +170°C
Custom Molded Parts

Custom Molded Rubber Parts

Precision injection and compression molded components for unique sealing and damping needs.

  • Materials: Silicone, NBR, EPDM, FKM
  • Processes: Injection, Compression, Transfer Molding
  • Secondary: Bonding, Insert Molding
TPE/TPR Parts

TPE & TPR Parts

Flexible, recyclable thermoplastic elastomers for soft-touch and sealing applications.

  • Shore Hardness: 30A to 85A
  • Applications: Automotive, Consumer Goods
  • Processing: Injection Molding
HDPE/LDPE Parts

HDPE & LDPE Parts

Lightweight, chemical-resistant plastic components for industrial and consumer use.

  • Materials: HDPE, LDPE
  • Properties: Low Moisture Absorption
  • Applications: Enclosures, Liners
PVC & ABS Parts

PVC, ABS, Acrylic Parts

Rigid plastic components with excellent dimensional stability and surface finish.

  • Materials: PVC, ABS, Acrylic, Nylon
  • Processes: Injection Molding
  • Applications: Electronics, Medical Devices
Rubber Extrusion Parts

Rubber Extrusion Profiles

Custom rubber seals, gaskets, and tubing for doors, windows, and industrial equipment.

  • Materials: EPDM, Silicone, NBR
  • Shapes: D, P, U, Custom Profiles
  • Lengths: Continuous or Cut
Rubber Bonded Metal Parts

Rubber-to-Metal Bonded Parts

Durable components combining metal strength with rubber sealing and vibration damping.

  • Bonding: Adhesive or Molding
  • Metals: Steel, Aluminum, Brass
  • Applications: Automotive, Industrial
Auto Molded Parts

Automotive Molded Parts

Seals, grommets, bushings, and dampers engineered for reliability in harsh environments.

  • Materials: NBR, EPDM, FKM, HNBR
  • Standards: ISO/TS 16949
  • Applications: Engines, Transmissions

Our Capabilities

High-Precision Molding

Imported vulcanization machines, CNC lathes, and nitrogen flash deflashing ensure micron-level accuracy and consistency.

Quality Assurance

100% inspection, tensile testing, aging resistance, compression set, solvent resistance, and automated hardness testing.

Material Diversity

Full compliance with ASTM D2000 standards. Wide range of elastomers and thermoplastics for any application.

20+
Years in Business
50+
Countries Served
100%
Quality Inspection
ISO
Certified Facility

Frequently Asked Questions

What materials do you offer for O-rings?

We offer Silicone, FKM (Viton), NBR (Nitrile), EPDM, HNBR, and other specialty elastomers compliant with ASTM D2000 standards.

Can you produce custom molded parts?

Yes, we specialize in custom rubber and plastic parts using injection, compression, and transfer molding with secondary operations like bonding and insert molding.

What industries do you serve?

We serve automotive, electronics, medical, instrumentation, HVAC, and industrial equipment manufacturers worldwide.

Do you provide samples?

Yes, we offer sample production for approval before mass manufacturing. Contact us for details.

Get in Touch

Reach out to our team for quotes, samples, or technical support.

Contact Information

Contact: Bin Gao

Phone: +86 574 8678 1565

Email: [email protected]

WhatsApp: +86 574 8678 1565

Address: No 536, Mingzhou West Road, Beilun District, Ningbo City, CHINA

Working Hours: Monday - Saturday (9:00 AM - 6:00 PM)

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