High-Toughness Black HNBR O-Rings 90 Shore A for Downhole Sealing

Product Overview

This listing covers black HNBR O-rings with a listed hardness of 90 +/- 5 Shore A for downhole sealing replacement review. Confirm the specific compound, dimensions and tool-groove requirements before ordering. Hardness alone does not establish a pressure rating, gas qualification or leak-free performance.

Material Comparison: HNBR vs. Others

HNBR vs. NBR (Standard Nitrile):
Compare the specific HNBR and NBR compounds against fluid, temperature, movement and mechanical-property requirements; confirm the approved formulation for the tool.

HNBR vs. FKM (Fluorocarbon):
Compare the specific HNBR and FKM compounds against the actual fluid, gas, temperature and exposure conditions. Do not infer steam or pressure suitability from polymer family names alone.

HNBR vs. EPDM:
Review weather exposure and fluid contact together. Confirm a suitable compound for petroleum-oil service before making an EPDM or HNBR substitution.

Technical Parameters and Specifications

Critical Dimension Measurement

To ensure a perfect fit, O-rings are measured by two key dimensions:

Inside Diameter (ID): The distance across the center from the inner edges.

Cross Section (CS): The thickness of the rubber ring itself.

When ordering, always specify the ID and CS to ensure the seal matches the groove dimensions of your hardware.

Company Profile

Established in 2013, Shanghai Qinuo Industry (SHQN) specializes in the engineering and manufacturing of high-performance rubber seals for the Oil & Gas industry.

Our production base in Nantong is equipped with over 30 advanced vulcanizing machines, delivering a monthly capacity of 20 tons (40,000 lbs) across 20+ product categories. Strategically located near Shanghai’s major air and sea ports, we ensure streamlined logistics and reliable global delivery.

Under our registered brands Royal Way® and SHQN®, we remain committed to our core principle: "Quality for Stability, Innovation for Progress." We provide the energy sector with durable, precision-engineered sealing solutions you can depend on.

FAQ

Question: Why is 90 Shore A hardness preferred for downhole sealing?
Answer: This listing specifies 90 +/- 5 Shore A. Review hardness together with compound, clearance, groove and backup components; the value alone does not establish extrusion resistance or a pressure rating.

Question: Can HNBR O-rings handle sour gas (H2S) exposure?
Answer: Confirm qualification of the specific compound for gas composition, temperature, pressure and exposure. The HNBR designation alone does not establish H2S or CO2 suitability.

Question: What is the shelf life of these HNBR O-rings?
Answer: Request storage and shelf-life guidance for the supplied compound, including manufacture date and packaging. Inspect seal condition before installation.

Question: How does temperature affect the performance of 90 Shore A O-rings?
Answer: Confirm continuous and peak temperature limits for the selected compound and medium. Include exposure duration and movement conditions in the tool-service review.

Question: Is it possible to get custom sizes outside of the AS568 standard?
Answer: Yes, we provide custom molding services for non-standard dimensions. Please provide the required Inside Diameter and Cross Section for a custom quote.

90 Shore A HNBR Groove and Backup Arrangement Review

For a downhole replacement order, supply the approved tool drawing and seal part reference. Specify inside diameter, cross-section, dimensional tolerances and 90 +/- 5 Shore A hardness. Identify the existing backup-ring arrangement and its position in the assembly. Include fluid or gas, working pressure, temperature and movement conditions. Confirm the compound and complete sealing arrangement before changing hardness or substituting a visually similar ring.