ISO 5263

Introducing ISO 5263 – Industrial Physics

ISO 5263 is the international standard that defines the laboratory disintegration of pulp — the essential first step in preparing pulp samples for handsheet making, fiber testing, and a wide range of physical and optical evaluations. The method ensures that pulp is dispersed uniformly, without cutting or damaging fibers, so downstream testing remains accurate and repeatable.

Whether you’re working with chemical, mechanical, recycled, or specialty pulps, ISO 5263 provides the controlled disintegration process required for reliable laboratory testing.

What ISO 5263 Covers

ISO 5263 outlines the procedures for standardized disintegration of pulp in water using a mechanical disintegrator. Key elements include:

• Preparing pulp samples at defined consistency
• Disintegrating pulp using a standardized rotor and vessel
• Ensuring uniform fiber dispersion without fiber cutting
• Specifying disintegration time, water temperature, and rotor speed
• Supporting consistent sample preparation for downstream testing

The method applies to:

• Chemical pulps
• Mechanical and semi‑chemical pulps
• Recycled fiber pulps
• Bleached and unbleached grades

ISO 5263 ensures that pulp samples are prepared consistently so that subsequent testing — from handsheets to fiber analysis — is accurate and comparable.

Where ISO 5263 Is Used

This standard is widely used across pulp and paper laboratories, including:

• Pulp mills and fiber‑processing plants
• Paper and board manufacturers
• Recycled‑fiber operations
• R&D and product‑development labs
• Accredited testing laboratories

It supports both routine quality‑control workflows and advanced research programs.

Why Standardized Disintegration Matters

Accurate pulp disintegration is essential for:

• Ensuring repeatable handsheet formation
• Supporting reliable fiber‑property testing
• Reducing variability in optical and physical measurements
• Maintaining consistency across laboratories and test runs
• Meeting international testing and certification requirements

ISO 5263 provides the foundation for trustworthy pulp‑testing results.

Testing solutions for ISO 5263

One product from the Industrial Physics portfolio aligns directly with ISO 5263’s requirements for standardized pulp disintegration:

73‑18 Digital Standard Disintegrator

The 73‑18 Digital Standard Disintegrator is engineered to deliver the precise, repeatable disintegration required by ISO 5263. Its controlled rotor speed, standardized vessel design, and digital timing ensure consistent sample preparation for all pulp types.

Key advantages include:

• Fully compliant with ISO 5263 disintegration requirements
• Digital control for accurate timing and repeatability
• Standardized rotor and vessel geometry
• Ideal for handsheet preparation, fiber testing, and QC workflows
• Robust construction for continuous laboratory use

Whether you’re preparing samples for routine QC or advanced R&D, the 73‑18 ensures your pulp is disintegrated to ISO‑defined standards.

Your Global Test and Measurement Partner for ISO 5263

Industrial Physics supports pulp and paper laboratories with the tools and expertise needed to meet ISO 5263 requirements. From standardized disintegration to handsheet forming, fiber analysis, and optical testing, we help ensure your results are accurate, consistent, and compliant.