August 28, 2018 - Automotive

Why More OEMs are Using Polypropylene, Smart Adhesives for it

According to American Chemical Council, plastics are being used in increasingly innovative ways to make cars safer and more fuel efficient. With the average car predicted to contain nearly 770 pounds of plastic by 2020, adhesive use to bond these plastic parts together will rise during that timeframe as well. Gain insight into one type of plastic expected to see high demand in particular and the smart adhesives for it.

Rising Polypropylene Use in Automotive

In recent years, polypropylene has started to see increased popularity among U.S. OEMs. With good temperature resistance, durability and environmental friendliness, this type of plastic is now replacing ABS for many U.S. automotive assembly applications, such as:

  • Door trim panels
  • Headliner clips

Offering unmatched versatility, polypropylene’s rising demand also is due in large part to its cost effectiveness. In an effort to reduce automotive assembly costs, carmakers look to use materials that offer the performance they need without a high price tag. Polypropylene is quickly becoming that solution.

automotive polypropylene

Automotive Adhesives Challenges When Using Polypropylene

However, as a low surface energy substrate, polypropylene can be difficult for adhesives to bond to during assembly. This is because low surface energy substrates are difficult to “wet out”, which adhesives must do to achieve sufficient bonds.

Additionally, today’s car interiors are subjected to higher temperatures, given increased exposure to UV rays with larger sunroofs. This also can make it difficult for adhesives to maintain needed performance levels and adequate bonds to polypropylene.

Smart Adhesive Solutions

Fortunately, Bostik’s smart adhesives are designed specifically for polypropylene’s low surface energy and have been adapted to handle today’s higher heat requirements. Additionally, they offer:

  • Excellent hot tack
  • Versatile substrate adhesion
  • High performance levels

Yet while polypropylene is quickly replacing ABS in the U.S., Bostik understands that ABS is still widely used in other parts of the world and offers smart adhesives for ABS applications as well. For more information on these solutions and how they improve automotive assembly, visit www.bostik.com.





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