Trapylen® 137 S 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

Application Method: Brush, Dip Coating, Spray

Technical Data Sheet

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Identification & Functionality

Product Type
CASE Ingredients Functions

Applications & Uses

Application Area
Application Method
Compatible Substrates & Surfaces
Coating Type
  • Using TRAPYLEN® 137 S as a primer dissolve the resin in xylene to 5 % solids. This primer can be applied by spraying, dipping, brushing or printing.
  • When using TRAPYLEN® 137 S 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 S 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
Soluble in
Ketones, Aromatics, Butyl acetate
Insoluble in
Aliphatics and Alcohols
Typical Properties
ValueUnitsTest Method / Conditions
Chlorine Content22%-
Dynamic Viscosity (at 20% in Xylene)70mPa.s-
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-
Molecular Weight60000g/mol-
Glass Transition Temperature (Tg)10°C-

Keep away from moisture and direct sunlight.

Packaging & Availability

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

Carton boxes with Al-inliner of 15 kg.

Storage & Handling

Storage Conditions

At least 12 months in closed packing at 15°C