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Cross-Linked Polyethylene Tubing Scrap, Hydronic Tubing, ASTM F 876-93

Description

  1. Overview
    1. Hydronic tubing manufactured from polyethylene plastic with a three-dimensional molecular bond created within the structure of the plastic during the manufacturing process.
    2. Cross-linking dramatically improves heat deformation, abrasion, chemical and stress crack resistance.
    3. Impact and tensile strength are increased, shrinkage decreased, and low temperature properties improved.
    4. Cross-linked tubes have a shape memory that only requires the addition of heat to return to its original shape when kinked.
  2. Application
    1. Used in hydronic heating systems that must withstand the rigors of long-term use in a difficult environment.
    2. Cross-linking adds a great deal of safety margin and produces a pipe that can easily meet the specifications for hot water heating set by code bodies.
  3. Manufacturing and Material
    1. Almost all tubing begins as high density polyethylene (HDPE) resin that is put through the cross-linking process during manufacturing.
    2. Tubes are never fully cross-linked because this would make them too brittle and highly prone to stress cracking.
    3. Too little cross-linking can have equally serious effects or result in a product that is no better than the original material.
    4. The ideal degree of cross-linking produces the best strength while retaining the flexibility needed for working with the tube and eliminating stress cracking.
  4. Specifications
    1. ASTM standard F 876-93 cross-linked polyethylene tubing requires a degree of cross-linking in the range from 65% to 89%.