Product Overview

Rubber O-rings are among the most versatile and essential sealing components used across global industries. Designed as a loop of elastomer with a round cross-section, these seals are engineered to be seated in a groove and compressed during assembly between two or more parts, creating a reliable leak-proof interface. Our High-Toughness Black HNBR O-Rings are specifically formulated for high-pressure environments, such as downhole drilling and oilfield operations, where standard seals often fail due to mechanical stress or chemical degradation.

Material Comparison: HNBR vs. Others

HNBR vs. NBR (Standard Nitrile):
While NBR is cost-effective for general oil resistance, HNBR offers much higher temperature stability and ozone resistance. HNBR also features significantly better tensile strength and abrasion resistance, which is critical for dynamic downhole applications.

HNBR vs. FKM (Fluorocarbon):
FKM is known for extreme chemical and high-temperature resistance. However, HNBR provides better physical toughness and superior resistance to abrasion and impact. In downhole environments involving high-pressure steam or water, HNBR often outperforms standard FKM, which can be prone to hardening or cracking in certain steam conditions.

HNBR vs. EPDM:
EPDM is excellent for weather and water resistance but fails instantly in the presence of petroleum-based oils. HNBR provides the oil resistance that EPDM lacks while offering similar or better mechanical durability.

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: High-pressure environments can cause softer rubber to squeeze into the gaps between metal parts, a process known as extrusion. 90 Shore A provides the necessary rigidity to resist this deformation while maintaining a secure seal.

Question: Can HNBR O-rings handle sour gas (H2S) exposure?
Answer: Yes, HNBR is specifically chosen for oilfield applications because it offers good resistance to hydrogen sulfide (H2S) and carbon dioxide (CO2), which are common in deep-well environments.

Question: What is the shelf life of these HNBR O-rings?
Answer: When stored in a cool, dry place away from direct sunlight and ozone-generating equipment, HNBR O-rings typically have a shelf life of approximately 10 years.

Question: How does temperature affect the performance of 90 Shore A O-rings?
Answer: At the lower end of the range, the material becomes less flexible but remains effective for static seals. At the higher end, prolonged exposure above 150 degrees Celsius may eventually lead to hardening and loss of elasticity.

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.