Overview
EN ISO 12625-3:2014 (CEN adoption of ISO 12625-3:2014) specifies a harmonized test method for measuring the thickness, bulking thickness, and for calculating apparent bulk density and bulk of tissue paper and tissue products. Measurements are made under a defined static loading pressure of 2.0 kPa. This part of ISO 12625 provides a consistent basis for thickness-related trade, quality control and product specification across the tissue industry.
Key topics and technical requirements
- Scope and purpose: Defines a single, repeatable method for thickness and density measurements of tissue papers and finished tissue products.
- Measurement principle: Thickness measured under a standardized load (2.0 kPa) to reduce variability caused by differing pressures, foot diameters and loading speeds used historically.
- Apparatus: Typical equipment includes a precision dead-weight micrometer, gauge blocks and a balance with appropriate attachments.
- Sample conditioning and preparation: Specified conditioning atmosphere and procedures (see referenced ISO 187) and detailed preparation of test pieces for single-ply and multi-ply (sheet and bulking) measurements.
- Test procedure and calculations:
- Single-ply thickness and single-sheet thickness determination
- Bulking thickness (stacked-sheet height) measurement
- Calculation of apparent bulk density and bulk (apparent specific bulk volume)
- Quality and precision: Annexes provide precision data, required measurement conditions and guidance on foot pressure characteristics.
- Harmonization: Supersedes earlier edition (EN ISO 12625-3:2005) and aligns measurement parameters industry-wide.
Applications
- Quality control and acceptance testing in tissue manufacturing (e.g., toilet tissue, kitchen towel, paper towels).
- Specification and comparison of base tissue and finished products between suppliers and customers.
- Product development and R&D to relate thickness to perceived softness, absorbency, or roll/stack dimensions.
- Contract testing and third-party laboratory reporting where consistent, reproducible thickness/density values are required.
- Trade documentation and dispute resolution where standardized measurement is necessary.
Who should use this standard
- Tissue manufacturers and converters
- Quality assurance and laboratory personnel
- R&D engineers and product developers in the hygiene and paper sectors
- Test laboratories and certification bodies
- Procurement teams specifying product requirements
Related standards
Keywords: EN ISO 12625-3:2014, tissue paper, thickness, bulking thickness, apparent bulk density, bulk, test method, 2.0 kPa, CEN, ISO 12625.