Precision Custom Sealing Solutions, Engineered for Extreme Environments
From a 2D drawing to full-scale mass production - SJK Seal designs and molds custom rubber seals, O-rings and rubber-to-metal bonded components matched to your exact groove, medium, temperature and pressure. 48-hour rapid prototyping. Zero-leakage quality commitment.
Years manufacturing
Rapid prototyping
Compound formulas
Certified factory
Customization Isn't a Costlier Choice
- It's a Lower Lifecycle Cost
The value of a customized seal isn't "making something non-standard" - it's using the optimal geometry and material to precisely match your equipment's real operating conditions, cutting leakage risk, extending maintenance cycles and reducing total cost of ownership.
Full-Spectrum Custom Manufacturing Capabilities
Product style, size, shape, tolerance and material - down to 0.4mm on small parts, up to several meters on large ones - built on production equipment we keep upgrading alongside industry trends.
Material Choices
FKM · FEPM · FFKM · GLT / GFLT · NBR · HNBR · EPDM · CR · Silicone · FVMQ · NR · ACR · PU · PTFE · Nylon
Certification
RoHS · REACH · FDA · NSF · WRAS · NORSOK · IATF 16949 quality system
Production Process
Compression molding · Injection molding · Extrusion · Turning · Bonding · Segmented vulcanization · Cutting · Laser cutting
Engineered Elastomer Materials for Every Challenge
Comprehensive performance comparison of standard rubber sealing materials under different working conditions.
Polyurethane Rubber (PU)
High mechanical strength, excellent wear & tear resistance.
Mechanical
Nitrile Rubber (NBR)
Superb oil resistance & physical properties for general hydraulic use.
Mechanical
Neoprene Rubber (CR)
Balanced flame resistance, weatherability & oil stability.
Mechanical
EPDM Rubber
Great steam, hot water, ozone & weather durability.
Mechanical
Butyl Rubber (IIR)
Exceptional gas tightness & chemical/acid resistance.
Mechanical
Fluoroelastomer (FKM)
Extreme high temperature, oil & chemical resistance.
Mechanical
Silicone Rubber (SI)
Wide temperature range & excellent physiological inertness.
Mechanical
Polyacrylate Rubber (ACM)
Good hot oil & ozone resistance for automotive sealings.
Mechanical
A Seamless 5-Step Customization Journey
Groove size, groove shape, motion type and cost all influence what we recommend - a simple static O-ring groove is a very different problem from a dynamic reciprocating seal. Give us as much detail as you can and we'll suggest the most cost-effective solution, not the most expensive one.
Design & DFM Review
Send your 2D/3D drawing, sample, or groove dimensions for a free manufacturability review.
Compound Formulating
We match or formulate a compound for your temperature, pressure and media exposure.
48H Rapid Prototyping
CNC-machined or mold-free samples in as little as 48 hours for fast validation.
Lab Testing
Tensile, hardness, compression set, ozone aging and dimensional verification.
Mass Production & VMI
Scaled molding with optional stocking / VMI program for long-term buyers.
Why Global OEMs Choose SJK Seal
Professional Advantage
A team of industry specialists with decades of hands-on experience, keeping pace with the latest sealing technologies to offer forward-looking, not just adequate, solutions.
Service Quality
A dedicated team supports every stage from pre-sales consultation to after-sales follow-up, with close attention to detail at each step.
Credit Guarantee
Every product undergoes strict quality testing. Once we commit to a customer, we follow through - that discipline is why buyers stay with us long-term.
Our Advantages
Supported Through Every Stage of Your Project
- Learning your industry's real needs
- Regular professional knowledge training
- Public welfare undertakings
- Material and size consultation
- Fast reaction to inquiries
- Photo or video quality checking before shipment
- We do our best to satisfy your requests
- Exchanges and returns
- Customer return visits
- Customer complaint handling
- Customer satisfaction survey
Frequently Asked Questions
What's the minimum order quantity for a custom seal?
There is no fixed MOQ. We support prototype orders of a few pieces through to mass production runs of 100,000+ pieces, with pricing tiers structured around your annual usage.
How long does prototype sampling take?
Mold-free CNC-machined samples can be ready in 48 hours; molded prototypes typically take 7–10 days depending on tooling complexity.
Do you sign NDAs for proprietary drawings?
Yes. We routinely sign NDAs for OEM customers and treat all drawings and specifications as strictly confidential.
Can you match a competitor's discontinued or hard-to-source seal?
In most cases, yes. Send a physical sample, drawing, or even just critical dimensions and material notes, and our engineers will reverse-match or improve on the original specification.
Have a Sealing Challenge? Let's Engineer the Fix.
Don't hesitate to contact us any time - our engineers respond within 12 hours.
Request Custom Quote →