ASTM D645

ASTM D645 is the Standard Test Method for Thickness of Paper and Paperboard. It measures caliper under a fixed pressure, so results stay consistent from sample to sample and lab to lab.

Thickness is a fundamental property in paper and paperboard — it affects stiffness, bulk, and how a material performs in converting and packaging. Because paper compresses under load, testing requires a deadweight instrument that applies a fixed, known pressure.

The ProGage Touch Thickness Tester is a precision deadweight micrometer built to fulfill ASTM D645 requirements for paper and paperboard for quality testing.

Related Standards

  • TAPPI T411 — Thickness of paper, paperboard, and combined board
  • ISO 534 — Thickness determination for paper and board
  • DIN 53105 — Thickness testing of paper and board

FAQ

What does ASTM D645 measure?
The thickness (caliper) of paper and paperboard, measured under a fixed pressure.

Why not use a regular micrometer?
Paper compresses under pressure, so a controlled deadweight instrument like the ProGage Touch is needed for repeatable results.

Can I use ASTM D645 for tissue?
No — the specified pressure can compress tissue and other low-density materials, skewing results.

How is it different from TAPPI T411 or ISO 534?
All measure caliper, but pressure, presser foot size, and dwell time differ. Confirm which one your spec requires.

What equipment do I need to test according to ASTM D645?
A calibrated deadweight thickness tester with the correct presser foot and pressure setting, such as the ProGage Touch.

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