Overview of Rubber Seal Hardness

-
Overview of Rubber Seal Hardness

Rubber seal hardness is a crucial performance indicator, directly impacting the sealing efficiency and service life. The hardness is typically measured using Shore hardness, with Shore A and Shore D being the most common scales. Shore A is used for softer rubber materials, while Shore D is applied to harder rubber and plastics.

Overview of Rubber Seal Hardness

Shore A Hardness

  • Range: Generally ranges from 0 to 100, with higher numbers indicating harder materials.
  • Application: Suitable for evaluating softer materials such as Nitrile Rubber (NBR), Fluoroelastomer (FKM), and Silicone Rubber (VMQ).
  • Typical Values:
    • Nitrile Rubber (NBR): 40A to 90A
    • Fluoroelastomer (FKM): 60A to 90A
    • Silicone Rubber (VMQ): 30A to 80A

Shore D Hardness

  • Range: Generally ranges from 0 to 100, with higher numbers indicating harder materials.
  • Application: Suitable for evaluating harder materials like some thermoplastic rubbers and rigid rubbers.
  • Typical Values:
    • Thermoplastic Rubber (TPR): 30D to 60D
    • Thermoplastic Polyurethane (TPU): 50D to 80D

Impact of Hardness on Sealing Performance

  • Low Hardness (Soft Rubber):
    • Advantages: Can accommodate larger deformations and irregular surfaces, making it easier to form an effective seal.
    • Disadvantages: Prone to extrusion under high pressure and has lower abrasion resistance.
  • High Hardness (Hard Rubber):
    • Advantages: Offers better abrasion resistance and anti-extrusion capabilities, ideal for high-pressure environments.
    • Disadvantages: Requires smoother surface finish and precise fitting, less adaptable to large deformations.

Hardness Testing Methods

  • Shore Hardness Tester: Measures material hardness by pressing a needle into the rubber surface.
  • Standards: Hardness testing is usually conducted following ASTM D2240 or ISO 7619 standards.

Selecting the Right Hardness for Rubber Seals

Choosing the right hardness for rubber seals involves considering several factors:

  • Operating Pressure: High-pressure conditions require harder rubber to prevent seal extrusion.
  • Operating Temperature: Different hardness materials perform differently under various temperature conditions.
  • Type of Medium: Different media have varying levels of corrosiveness, requiring appropriate material and hardness selection.
  • Assembly Conditions: If the assembly requires significant deformation, softer rubber should be chosen.

Contact Us

For more information about Overview of Rubber Seal Hardness,contact Nuoxutech at contact@nuoxutech.com or visit our website www.nuoxutech.com .You can also reach us on WhatsApp at +86 13849062209.Our team is ready to provide you with professional service and support.

Keywords: vacuum pump, vacuum system, nuoxutech, rubber seal hardness, Shore A, Shore D, NBR, FKM, VMQ, TPU, TPR

Comments

Post a Comment