How to Repair High-Density Polyethylene


High-density polyethylene plastic is used for purposes that require a greater tensile strength than that found in polyethylenes with less density. Many chemical containers, perishable foods, water containers, fuel tanks and plastic lumbers are made of HDPE. While HDPE has a different chemical composition than other polyethylenes, repairing high density polyethylene plastic is no different than repairing any other. When heated, polyethylene melts and the molecules bond with other polyethylene molecules without changing the chemical composition of the plastic. As a result, HDPE is easily plastic welded.

Things You'll Need

  • Scrap polyethylene
  • Carpenter knife
  • Assess the damage to the high-density polyethylene. If the plastic is cracked, measure the length. If it has a hole, measure the diameter. Score a piece of polyethylene from your scrap piece. Make it two inches longer than the crack and two inches wider, or two inches greater, than the diameter of the hole in the HDPE.

  • Find the ends of the crack and drill holes in them to assure the crack will not spread after your weld cures. Drill pilot holes every inch on both sides of the crack, 1 3/4-inch from the crack. For a hole, drill pilot holes 1 3/4-inch from the perimeter 1-inch apart. Center the patch you scored from the scrap piece over the crack or hole.

  • Begin heating the patch by passing the heat gun over it. If you hold the heat gun over the patch for an extended period of time, you will burn it. Hold the heat gun over the patch for a few seconds, then check the patch. When it begins to melt, spread the liquid out towards the pilot holes. You must force the liquid polyethylene into the holes so the patch will adhere to the damaged plastic. Once you have filled the pilot holes with polyethylene from the melted patch, pour water on the patch to cure it.

Related Searches


  • Photo Credit Jupiterimages/Comstock/Getty Images
Promoted By Zergnet


You May Also Like

  • How to Repair Cracks in Polyethylene

    Polyethylene has made its way into many components of cars, motorcycles and boats. Although strong and lightweight, polyethylene is not impervious to...

  • How to Patch Polyethylene Tanks

    Polyethylene is one of the most popular types of plastic used in the industrial and commercial market. It is a polymer with...

  • How to Clean High Density Polyethylene

    High density polyethylene, abbreviated as HDPE, is a type of plastic commonly used to make milk jugs, laundry detergent containers, soda bottles...

  • How to Glue High Density Polyethylene

    HDPE, or high-density polyethylene, is a thermal plastic made, like any other plastic, from petroleum. It is often used as the material...

  • How to Weld Polyethylene

    Polyethylene is a type of high-density plastic that is used to make kayaks, aquariums, hauling tanks, pipes and drain culverts. It can...

Related Searches

Check It Out

22 DIY Ways to Update Your Home on a Small Budget

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!