TAPPI T 231 (cm) — Zero-span breaking strength of pulp (dry zero-span tensile)

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TAPPI T 231 is the test method for measuring the dry zero-span tensile strength of a randomly oriented pulp fiber specimen, an indicator of intrinsic fiber strength. To match a setup to this test, talk with our team.

What TAPPI T 231 Measures

Zero-span tensile clamps a pulp specimen with effectively no distance between the jaws, so the result reflects the strength of the fibers themselves rather than fiber bonding. It is used to judge pulp quality and refining effects.

How the Test Is Run

A pulp handsheet or specimen is clamped at zero span and pulled to failure, and the breaking force gives the zero-span tensile strength. Consistent clamping pressure and specimen preparation control the result.

Preparing Specimens

Uniform specimens and controlled conditioning are essential for repeatable zero-span results. To set up zero-span tensile testing, request a quote.

Reading the Designation

Cited as TAPPI T 231 with its revision year. Confirm the edition and conditioning requirements.

Related Standards

ISO 6892-1 is the reference uniaxial tensile method for metallic materials, for comparison.

Request a Quote

Setting up zero-span tensile testing of pulp? Request a quote and our team will help you build a system matched to your specimen type and clamp requirements.

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Get ready for TAPPI T231 with TensileMill CNC

Adding capacity or replacing older equipment? TensileMill CNC can support your TAPPI T231 program. Depending on your specimens, that can include universal testing machines, wedge or pneumatic grips, and flat and round specimen-preparation systems. Send us your specimen types and target standards, and we will help you spec the right system.