Overview
EN ISO 7213:2021 is an international standard developed by ISO/TC 6 in collaboration with CEN/TC 172, specifying a method for sampling pulp-delivered in bales or rolls-to obtain a gross sample representative of a lot for testing purposes. This standard applies to all types of pulp except when the aim is to determine saleable mass, for which separate standards like ISO 801-1 and ISO 801-2 are used. However, if saleable mass determination is combined with other property tests, the gross sample from those standards may also be utilized in accordance with EN ISO 7213:2021.
This methodical approach ensures that pulp quality assessments are accurate, reliable, and consistent across diverse production lots, supporting quality control, research, and compliance in the pulp and paper industry.
Key Topics
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Scope and Purpose
Defines the method for collecting representative pulp samples from bales or rolls for various testing needs, excluding pure saleable mass determination.
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Sampling Terminology
Clarifies important terms such as:
- Lot - bulk quantity of pulp of uniform grade.
- Sample bale (or roll) - individual bale selected for sampling.
- Specimen - sample taken from each bale or roll.
- Gross sample - combined specimens forming the test sample.
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Sampling Principle
Randomly select a minimum number of bales or rolls based on lot size (generally not exceeding 32 samples), take equal-sized specimens from each, and combine them to create a representative gross sample.
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Sample Bale Selection
Emphasizes intact, minimally damaged bales or rolls selected randomly to accurately represent the entire lot. Guidance is provided on minimum sample numbers relative to lot size.
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Specimen Extraction Methods
Instructions for sampling pulp forms:
- Pulps baled in sheets: removing inner sheets while avoiding edges and outer layers
- Flash-dried pulps in slabs: extracting from inner corners avoiding outer exposed surfaces
- Pulps in rolls: removing outer layers before sampling
- Combined bale units: top and bottom bale sampling methods
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Handling and Protection
Details on wrapping samples to prevent contamination, avoiding metallic tools especially for trace metal analysis, and storage conditions to maintain sample integrity.
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Sampling Report Content
Specifies necessary documentation details such as lot identification, reference to the standard, sampling date/location, number of bales sampled, unusual observations, and deviations from prescribed procedures.
Applications
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Quality Control in Pulp Production
Enables pulp producers and buyers to obtain statistically representative samples for testing fibre quality, moisture content, impurities, and other standard physical and chemical analyses.
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Research and Development
Facilitates uniform pulp sampling in R&D environments to ensure comparability of test results and product innovation.
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Regulatory Compliance
Supports environmental and safety assessments by ensuring standardized sampling practices accepted internationally.
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Trade and Contract Verification
Provides a documented, agreed-upon method to sample pulp that underpins commercial transactions and dispute resolutions.
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Testing for Diverse Pulp Types
Applicable to chemical pulps, mechanical pulps, flash-dried pulps, and other industrial forms delivered in bales or rolls.
Related Standards
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ISO 801-1 - Pulps - Determination of saleable mass in lots - Part 1: Pulp baled in sheet form
Specifies saleable mass sampling for sheet bales.
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ISO 801-2 - Pulps - Determination of saleable mass in lots - Part 2: Pulps baled in slabs
Covers saleable mass determination for slab pulps, including flash-dried types.
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ISO Technical Committees
ISO/TC 6 responsible for paper, board, and pulps standardization, ensuring EN ISO 7213 aligns with broader pulp and paper sector standards.
Keywords: pulp sampling, representative gross sample, pulp testing, pulp quality control, EN ISO 7213:2021, ISO pulp standards, pulp bales sampling, pulp rolls sampling, pulp lot sampling, paper industry standards.
