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If you are a customer, this Bumpers Urethane repair especially for PUR (Polyurethane thermoset) type material and features of urethanes as expressed here! Thermoset materials instead have undergone a chemical reaction at the time of their initial forming and this causes them to be rigid, non-melting heat resistant plastics. This means that the welding techniques used on other plastics, will not work effectively.
Thermoset Urethanes Explained
Material Properties: Thermoset Urethanes cannot melt They also tend to bubble and chemically break down under high heat, resulting in an adhesive beach rather than one sold bond12.
Identification: workable than by applying heat to the backside of the bumper and identification whether it begins melting. If the material bubbles and stays sticky where it was skipped to cool, then that is likely PUR3.
Repair Techniques
Prep: The affected area has to be cleaned well. For better adhesion23, create a V-groove along the crack with cutting tool
Welding Method: An airless plastic welder for urethane at the correct temperature. Without trying to melt the bumper material through feeding of welding rod into the groove which created. Rather, the rod operates as a hot glue and adheres the surfaces together45.
Final Touch: Run the welding rod while it is still warm filling in any imperfections. Cool and then grind the region to be flat finished, sand necessary for aesthetic purporse23.
Common Mistakes
Trying to melt the base can have adverse effects, such as poor adhesion and damage.
If the surface is not properly prepared, it can lead to meek repairs that do not with stand the test of time14.
As you can see, repairing urethane bumpers comes down to knowing the material and using techniques that are not relevant when fixing traditional plastic. Durable repairs will be achieved through careful preparation and execution.
