ASTM D1781

Standard Test Method for Climbing Drum Peel for Adhesives

Micom Laboratories offer peel resistance tests for adhesives according to the standard ASTM D1781. Widely used in the aerospace and rail industries, this method allows for determining the peeling force of a conditioned adhesive. It is often used as a comparison testing tool to choose between 2 different process conditions.

About ASTM D1781 Test Procedure

The test consists of peeling a face skin of a conditioned adhesive bonded sandwich around a circular drum. First, the specimen has both its ends securely clamped and backed with a thick rigid plate to avoid projections. After an initial load is applied to overcome the drum’s assembly torque, peel resistance is determined by loading the apparatus in tension at a constant crosshead speed over a minimum distance of the bond. Micom offers peel resistance testing with respect to ASTM D1781 as part of the Polymer Testing services.

Useful Information

This method is sensitive to adherent surface preparation, meaning the use of another coating such as primer can affect the results. The use of brittle adhesive also needs more carefulness. The drum setup should not weigh more than 3.6 kg (8 lb). The maximum load applied on the specimen shall be between 15% and 85% of the full-scale capacity of the testing machine.

Typical Experimental Parameters

  • Number of specimens: at least 6
  • Dimensions of specimens:
    • For adhesives in laminated assemblies: 25 mm x at least 254 mm (W x L)
    • For adhesives in sandwich constructions: 76 mm x 305 mm (W x L)
  • Temperature: 23 +/- 1 C
  • Humidity: 50 +/- 2 %

For any questions regarding ASTM D1781 or for a more complete description from one of our materials testing specialists, please contact our material testing lab today.

In addition to ASTM D1781 testing, Micom offers several other tests grouped under polymer testing including ASTM D3359 and ASTM C297 which are test methods related to adhesive strength. You can learn more about our polymer testing services by downloading our brochure below.

Paint, Coating and Polymer Testing