Trapylen® 137 T is a chemically modified low-chlorinated polypropylene renowned for its exceptional affinity to polyolefinic plastics like PP, PP/EPDM blends, and, to a certain extent, PE. It serves a dual purpose as both a straight primer and an adhesion promoter, proving valuable for base coats and pigmented primers. Its primary application lies in the realm of paintings and coatings for molded components and sealing profiles within the automotive sector, spanning areas like bumpers, side panels, and door seals. Additionally, Trapylen® finds utility in adhesives and flocking agents for door seals, as well as in various industrial applications where chemically pretreated PP-based plastics are employed.

Functions: Adhesion Promoter, Coupling Agent

Product Type: Primer

Application Area: Automotive Bumpers, Side Panels

Application Method: Brush, Dip Coating, Spray

Technical Data Sheet

Ask P.A.T. Products Questions

Leo Coyle avatarErik Espling avatarLogan York avatar

Enhanced TDS

Identification & Functionality

Product Type
CASE Ingredients Functions

Features & Benefits

Ready-to-Use Product Features

Applications & Uses

Application Method
Compatible Substrates & Surfaces
Coating Type
  • Using TRAPYLEN® 137 T as a primer dilute the resin solution with xylene or toluene to 5 % solids. This primer can be applied by spraying, dipping, brushing or printing.
  • When using TRAPYLEN® 137 T as adhesion promoter in base coats/pigmented primers, the compatibility of the system must be checked. The resulting base coat can be applied by spraying, dipping, brushing or printing if the system allows it.
  • TRAPYLEN® 137 T is used either as a straight primer or as an adhesion promoter for base coats and pigmented primers.
  • Its principal use is in paintings/coatings for molded parts and sealing profiles in the automotive industry, such as bumpers, side panels and door seals.
  • TRAPYLEN® can also be used in adhesives and flocking agents for door seals. Furthermore it is used in industrial applications where PP based plastics are chemically pretreated.


Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Dynamic Viscosity600mPa.s-
Chlorine Content22%-
Softening Point85.0°C-
Drying Conditions (at 80°C, as primer)30seconds-
Resin (as primer)3 - 4g/m²-
Drying Conditions (at 80°C, as adhesion promoter)30minutes-
Resin (as adhesive promoter)15g/m²-
ValueUnitsTest Method / Conditions
Solid Content20.0%-
  • Gel formation is possible at lower temperatures.
  • Before use it is strictly recommended to keep the drums at 40 - 50°C for a while until the solution returns to liquid phase.
  • Gel formation is reversible and has no influence on the product's quality.
  • Both available with 5 % or 10 % solids and dry resin.

Packaging & Availability

Packaging Type
Regional Availability
  • Canada
  • Mexico
  • USA
Packaging Information

Iron drums of 170 kg.

Storage & Handling

Storage Conditions

At least 6 months in closed packing at 15°C