High Temperature Shock Oil Seal for Hydraulic Shock Absorbers

We provide a complete material certification package including: Shore A hardness (tested to GB/T531-1999), tensile strength and elongation at break (GB/T528-1998), compression deformation at 100°C × 70 hours (GB/T7759-1996), tear strength (GB/T529-1999), air oven aging test results (GB/T3512-2001), oil resistance in both IRM901 and IRM903 reference oils (GB/T1690-1992), and brittleness temperature (GB/T1682-1994). Our standard NBR compound achieves 14.2 MPa tensile strength and 265% elongation — both significantly exceeding specification minimums. Test reports accompany every production shipment.

Our NBR oil seals are tested for thermal stability through standardized air oven aging at elevated temperatures per GB/T3512-2001. The test data demonstrates exceptional thermal resistance: after accelerated aging, hardness changes by only +3 points, tensile strength decreases by merely 2%, and elongation reduction is just 6% — all well within specification limits. The brittleness temperature of −40°C confirms low-temperature flexibility. For applications requiring sustained operation above 120°C, we also offer FKM (Viton) and Silicone compound alternatives with enhanced high-temperature resistance up to 350°C.

We implement a rigorous dimensional control system: 100% inspection of critical dimensions (main lip, dustproof lip, OD, and heights) using calibrated projectors and digital calipers. Actual production measurements are documented for every batch — for example, our main lip diameter consistently measures between 18.12–18.16 mm against a specification of 18.20±0.35 mm, demonstrating process capability well within the tolerance band. Our dual QC/PQC inspection system provides redundant verification to catch any drift before it affects production output.

XIAYI is a comprehensive shock absorber parts manufacturer. Beyond oil seals, we produce: powder metallurgy pistons, rod guides, base valves (foot valves), piston rods, valve discs, stamping parts, and various sintered components (Fe/Cu-based). We also manufacture compression valve seats in multiple dimensions (OD 28–35 mm range) and offer custom sizes. For customers seeking integrated sourcing, we can supply complete component kits for shock absorber assembly, reducing your supplier count, logistics complexity, and total procurement cost.

Our standard MOQ is 1,000 pcs for production orders. Sample orders can be accommodated in smaller quantities with a lead time of approximately 10 days. For new sample development, delivery is approximately 30 working days after technical drawings and specifications are confirmed. Our monthly supply capacity of 50,000 pcs ensures we can support both pilot programs and full-scale production requirements. We accept T/T, Western Union, and L/C payment methods, with standard export packaging provided for all shipments.

Yes, we specialize in custom OEM manufacturing. Provide your 2D/3D drawings with required dimensions (lip diameters, OD, heights, and any special profile features), material specifications, and target quantities. Our engineering team will review feasibility, recommend optimal compound selection, and provide a quotation. We can match or customize Shore A hardness within a ±5 point range and formulate compounds for specific oil resistance, temperature, or mechanical property requirements. We also offer design optimization suggestions based on our extensive shock absorber application experience.

Powder metallurgy (PM) offers several advantages for shock absorber components: near-net-shape manufacturing reduces material waste by up to 90% compared to machining from bar stock, controlled porosity enables self-lubrication for reduced friction and wear, high-volume production consistency exceeds what is achievable with individual machining, and the process is more energy-efficient and environmentally friendly. Our PM process flow — Mixing → Compacting → Sintering → Re-Sizing → Ultrasonic Cleaning → Vacuum Oiling → Packing — produces components with high precision, low noise characteristics, and excellent wear resistance at a competitive cost. We can manufacture gears, bearings, bushings, and structural sintered parts to your drawings or samples.