1.1.11 Thermal Joint: Thermal Plastic Welding

Thermal welding merges thermoplastic parts with heat and pressure. Many plastics can be welded, such as acrylic or polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PETE or PET), polyvinyl chloride (PVC) and acrylonitrile-butadiene-styrene (ABS). Plastic welding may also repair cracks in damaged plastic pieces.

Requirements include hot air welding tools, plastic welding rods, extruders, heating and cooling time, and pressure. Most plastic welding processes require fixtures to hold the plastic components together to form a complete bond as the heat is added to the weld joint.

1.1.12 Chemical Joint: Solvent Welding

Solvent welding uses a solvent to dissolve the surfaces of two chemically similar plastic parts. When the two parts are pressed together and the solvent evaporates, the surfaces are permanently fused. Solvent welding is used for plastics like PVC and ABS, which may be dissolved by solvents. The solvent must be chosen for the specific plastic being welded. Plastics that are not vulnerable to solvents, such as PP and PE, cannot be solvent welded. Manufacturers with concerns about solvents may avoid using this technique.

Table of contents


have already
signed up

Award winning manual

Platinum Award for LOCTITE®X Digital Manual

The Digital Manual is for professionals by professionals

The manual is made entirely for you. However, if you’re still not convinced that free industry knowledge is for you, take a look at these user testimonials from the users of the manual.

"The topics are such that I can help take design related decisions very well at work. It's an interesting and knowledgeable read, I recommended my other colleagues to have a look at the manual as well."

Hanumant, Production Incharge

"The manual's chapters significantly enhanced my comprehension of various engineering topics. The manual adeptly presents explanations and examples of concepts, showcasing a high level of clarity and effectiveness in its content."

Tejas, Mechanical Engineer from a renowned Engineering College

"The release of this manual by a renowned brand such as Loctite has proven to be highly motivating for students. Its authentic content serves as a source of inspiration, encouraging students to engage actively in reading and learning."

Padmakar Deshmukh, Professor at an Engineering College