Overview
ISO 5638:1978 is an international standard developed by the International Organization for Standardization (ISO) that specifies a method for determining the grammage of single layers in glued and laminated solid fibreboard. This standard is applicable to all types of solid fibreboard as defined by ISO 4046, provided that the adhesive used dissolves under the testing conditions. The method ensures accurate and consistent measurement of the weight per unit area (grammage) of individual layers separated from solid fibreboard.
Key Topics
- Scope: Applicable to single layers of glued and laminated solid fibreboard, covering all varieties defined in ISO 4046.
- Test Method:
- Cutting test pieces with controlled accuracy.
- Conditioning board specimens according to ISO 187.
- Immersing samples in water to enable delamination without fiber damage.
- Removing surface adhesive carefully.
- Drying individual layers to constant mass at 105 ± 2 °C.
- Weighing conditioned layers precisely to calculate grammage.
- Apparatus:
- Precision cutting device for test pieces.
- Accurate weighing device calibrated for the required mass range.
- Submersion tank for delaminating layers.
- Drying chamber with regulated air circulation.
- Sampling: Test pieces must be selected and prepared following ISO 186 to ensure representative results.
- Expression of Results: Grammage is expressed in grams per square metre (g/m²), calculated using the mean mass and area of test pieces.
- Test Report Requirements: Includes reference to ISO 5638, type and origin of fibreboard, number of test pieces, conditioning atmosphere, description of samples, mean grammage, place and date of testing, and details of any deviations.
Applications
The practical applications of ISO 5638:1978 include:
- Quality Control: Manufacturers of solid fibreboard can ensure product consistency by measuring the grammage of individual layers, a key parameter affecting board strength and performance.
- Material Specification: Enables precise specification and verification for laminated fibreboard used in packaging, construction, and furniture industries.
- Research and Development: Facilitates studies on laminated fibreboard properties and performance by providing a standardized method for layer analysis.
- Compliance and Certification: Supports compliance with international quality standards and certification processes where the physical properties of fibreboard layers are critical.
Related Standards
- ISO 4046: Defines terms and classifications related to paper, board, pulp, and related materials, providing the foundational definitions for solid fibreboard types.
- ISO 186: Specifies sampling procedures for paper and board products to ensure representative sample selection.
- ISO 187: Covers conditioning of test samples under controlled temperature and humidity prior to physical testing.
- ISO 5638: Integrated with these standards, it ensures harmonized testing and terminology across fibreboard quality assessments.
In summary, ISO 5638:1978 delivers a crucial, standardized procedure for accurately determining the grammage of single layers in glued and laminated solid fibreboard. This method supports manufacturers, quality assurance professionals, and researchers in maintaining high standards for fibreboard products globally. By adhering to internationally accepted sampling, conditioning, and testing procedures, ISO 5638 ensures reliable, repeatable results that help optimize material use and product performance.
