Flexible 70 Shore HSN Elastomer O-Rings for Downhole Drilling Equipment

Product Overview

Our Flexible 70 Shore HSN Elastomer O-Rings are specifically designed for downhole drilling equipment where a balance between elasticity and chemical resistance is required. The 70 Shore A hardness provides excellent sealing performance at lower initiation pressures compared to harder variants, ensuring a tight seal even in imperfectly machined grooves.

Material Comparison: HNBR vs. Others

HNBR vs NBR (Standard Nitrile):

While NBR is suitable for basic oil-resistant applications at low temperatures, it degrades quickly when exposed to ozone or temperatures above 100 degrees Celsius. HNBR provides a much wider temperature range and vastly superior resistance to weathering and modern oilfield chemicals that would cause NBR to harden and crack.

HNBR vs FKM (Fluoroelastomer):

FKM is often cited for its extreme heat and chemical resistance. However, HNBR is generally tougher in terms of physical properties. HNBR offers better abrasion resistance and higher tensile strength, making it more durable in dynamic applications where the seal moves against a metal surface. Furthermore, HNBR typically performs better in high-pressure water and steam environments where certain types of FKM might struggle.

Technical Parameters and Specifications

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: What is the benefit of 70 Shore A hardness over 90 Shore A?
Answer: 70 Shore A is more flexible and easier to install. It provides a better seal at lower pressures because it conforms more readily to the sealing surface. It is the standard choice for general-purpose sealing where extreme high-pressure extrusion is not the primary concern.

Question: Is HSN the same as HNBR?
Answer: Yes, HSN (Highly Saturated Nitrile) and HNBR (Hydrogenated Nitrile Butadiene Rubber) are different names for the same chemical elastomer. Both terms are used interchangeably in the oil and gas industry.

Question: Can these O-rings be used with sour gas (H2S)?
Answer: Yes, HSN/HNBR is highly recommended for sour gas service. It resists the hardening and embrittlement that occurs when standard elastomers are exposed to hydrogen sulfide.

Question: How should I store HSN O-rings to maximize their life?
Answer: Store them in a cool, dry place, ideally in a sealed bag. Keep them away from direct sunlight, UV light, and ozone-producing electrical motors to prevent premature aging.

Question: Are these O-rings suitable for high-temperature steam?
Answer: HSN/HNBR provides good resistance to steam up to 150 degrees Celsius. For steam applications exceeding this temperature, specialized perfluoroelastomers may be required.

Question: Can I use 70 Shore HSN for dynamic (moving) seals?
Answer: Yes, the 70 Shore hardness is excellent for dynamic seals because it offers a good balance of friction and sealing force. However, ensure the lubrication is compatible with the elastomer.

Question: How do I identify if an O-ring is HNBR rather than standard NBR?
Answer: Visually, they often look identical. The best way to differentiate is through laboratory testing or by checking the manufacturer’s certification. HNBR will typically have a much higher resistance to heat when placed in a controlled oven test compared to NBR.