Flexible PVC Tubing

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631 Flexible PVC Tubing Product Photo

Product Description:

Grayline 631 is an excellent general purpose flexible polyvinyl chloride tubing designed to meet the requirements of MIL-I-631, grades A & B.  This tubing is typically used in appliances, automobiles, military wiring harnesses, airborne equipment, and any application where a wide thermal range is required.

  • Standard Packaging: Reels or Cut to Customer Specifications
  • Standard Colors: Clear, Black,
  • Available Options:
    • Custom ID-Wall
    • Custom Colors

Specifications/Agency Ratings

  • MIL-I-631, Type F, Form U, Grade B, Class I & II, Category I
  • MIL-I-631, Type F, Form U, Grade A, Class I & II, Category I
  • FMVSS302
  • Yazaki YPES-11-03-012
  • EU Directive 2000 / 53 / EC (ELV)
  • EU Directive 2011 / 65 / EU (RoHS2)
  • EU Directive 2015 / 863 (RoHS3)


  • Operating Temperature is -50° to 80°C
  • Extreme Low Temperature Flexibility
  • Flame Retardant
  • Fungus Resistant
  • UV Resistant
  • Lead Free
  • High Gloss Finish


If your looking for MIL-I-631, Grade C tubing, please go to 105C PVC Tubing.

Durometer Hardness, Shore A (15sec.)82ASTM D2240
Tensile Strength (psi)2700ASTM D412
Elongation (%)400ASTM D412
Flammability (sec)6MIL-I-631, Category I
Specific Gravity1.23ASTM D792
Brittleness Temperature, Pass °C-46ASTM D746
Oxygen Index26.5ASTM D2863


The values listed in this bulletin, to the best of our knowledge, are accurate. They are typical performance results and are not intended to be used as design data. We disclaim all liability in connection with the use of information contained herein or otherwise.

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