ISO 12507:2025

Overview

ISO 12507:2025 - Paper and pulp - Deinkability test for printed paper product mixtures containing woodfree printed paper - is a laboratory test method for assessing the deinkability of woodfree printed paper when present as a minor fraction in a mixed printed-paper stream. The method simulates a single-stage alkaline flotation deinking process using fatty acid–based collector chemistry and specifies testing a mixture composed of 10% by weight woodfree printed paper with the balance being printed wood-containing (mechanical-pulp based) paper. The standard is intended to give an indication of how such mixtures will perform under typical alkaline flotation deinking at laboratory scale.

Key technical topics and requirements

• Scope and principle: Simulates ink detachment and removal under standardized alkaline deinking and single-stage flotation conditions; not intended for near-neutral/neutral flotation or additional industrial steps such as washing, bleaching, post-flotation dispersion, or extensive cleaning/screening.
• Sample composition: Tests mixtures containing 10% woodfree printed paper blended with mechanical-pulp based printed papers to reflect common post-consumer streams.
• Equipment and chemicals: Specifies general laboratory equipment, pulping devices, flotation cell examples, and the use of fatty acid-based collectors for flotation chemistry.
• Procedure and sample handling: Covers sampling, identification, removal of non-paper materials, accelerated ageing, pulping, pH control, dilution, flotation, and yield determinations.
• Specimen preparation and analysis: Procedures for preparing filter pads, membrane filters and handsheets; analytical methods include reflectance measurements, filtrate darkening assessment, and dirt particle measurement (scanner-based), plus guidance on moisture and ash determinations.
• Reporting: Defines information to include in the test report and annexes on device examples, filter testing, pH testing for small samples, and threshold/size classification.

Practical applications and users

• Recycling and deinking laboratories validating how a small fraction of woodfree print affects deinkability in mixed streams.
• Paper mills and deinking plants assessing feedstock blends and predicting flotation deinking performance under alkaline conditions.
• Paper manufacturers, converters, and brand owners seeking to understand recyclability and process compatibility of printed products.
• R&D groups developing inks, coatings, or collector chemistries and needing standardized lab-scale comparison methods.
• Standards organizations and procurement/specification teams incorporating deinkability criteria into quality or sustainability scorecards.

Related standards

• ISO 21993 (mentioned as an adjunct method for testing 100% printed articles under alkaline conditions) - use ISO 12507:2025 when the woodfree fraction is a minor component of a mixed stream.

Keywords: ISO 12507:2025, deinkability test, woodfree printed paper, flotation deinking, alkaline deinking, fatty acid collector, paper recycling, laboratory method.