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Adhesives | ViscoQC Quality Control of Adhesives

How can viscosity testing of adhesives improve adhesive bonded joints? This application report shows typical measurements for production and processing of adhesives with Anton Paar's rotational viscometer ViscoQC™ 100.


Viscosity is one of the most important parameters in production and processing of adhesives. Further incoming material must be viscosity tested before using it (e.g. in a dosing system).

For low-viscosity adhesives, viscosity is important for penetrating the gluing surfaces and for flowing into the gluing gap. For high-viscosity adhesives the correct viscosity is required to bridge larger gaps and to prevent it from flowing into small gaps and pores on the surface.

Adhesives can be single component, but they often consist of two components, the resin and the hardener. This example shows a polyurethane based resin and an isocyanate hardener.

Both components separately and the mixed product need to be viscosity tested. For this report, the resin's viscosity is measured.


  • Instrument: ViscoQC™ 100 - H
  • Spindle: RH3
  • Speed: 20 rpm, 30 rpm, 40 rpm (According to the standard, the tests needs to be done within a range of 45 % to 95 % torque)
  • Temperature: 25 °C
  • Sample: Resin, 25 to 30 Pa·s at 20 °C.

All measurements were performed with ViscoQC™ 100 - H viscometer from Anton Paar GmbH according to ISO 2555.

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