ISO 5424:2022

Overview

ISO 5424:2022 - Plastics - Industrial compostable plastic drinking straws specifies terms, basic and technical requirements, test methods, inspection rules and packaging for drinking straws intended for industrial composting. The standard provides a clear framework for manufacturers, laboratories and procurement teams to evaluate dimensional quality, mass consistency and industrial compostability of plastic straws in line with established ISO test protocols.

Key Topics and Requirements

• Scope and definitions: Covers terms such as compostable plastic, industrial composting, spoon-type and pointed straws (aligned with ISO 17088 definitions).
• Technical requirements (high-level):
  • Length deviation: ≤ ±2%
  • Outer diameter deviation: ≤ ±3%
  • Wall thickness ratio (max/min): ≤ 1.2
  • Damage rate after straightening corrugated pipes: ≤ 2%
  • Total mass deviation (100 straws): ≤ ±5%
• Test methods:
  • Conditioning and testing atmosphere per ISO 291.
  • Dimensional and mass measurements with specified reading resolutions (e.g., ruler to 0.5 mm for length, calipers to 0.02 mm for diameter, balance to 0.1 g for mass).
  • Wall thickness uniformity per ISO 18188:2016 (section 6.3.4).
  • Industrial compostability assessment performed according to ISO 17088.
  • Spoon-type end and corrugation damage tests are specified with measurement formulas and visual inspection procedures.
• Inspection and sampling:
  • Double sampling plan for normal inspection per ISO 2859-1, general inspection level II, AQL = 6.5.
  • Factory inspection and type testing classifications; batch-based acceptance rules.
• Packaging and labelling:
  • Requirements for packing quantities and labelling of both outer and inner packaging to support traceability and market compliance.

Applications and Who Uses It

• Manufacturers and product designers: define product specifications and production tolerances for compostable straws.
• Quality managers and production control: implement inspection, sampling and batch acceptance procedures.
• Testing laboratories: apply the specified measurement and compostability methods to verify compliance.
• Procurement and supply chain: include ISO 5424:2022 criteria in supplier contracts and tenders.
• Regulators and certification bodies: use the standard as a reference for market surveillance and conformity assessment where industrial composting infrastructure exists.
• Composting facilities and waste managers: interpret compostability test outcomes to ensure compatibility with industrial composting systems.

Related Standards

• ISO 17088 - Organic recycling - Specifications for compostable plastics (compostability criteria)
• ISO 291 - Standard atmospheres for conditioning and testing
• ISO 2859-1 - Sampling procedures for inspection by attributes
• ISO 18188:2016 - Specification of polypropylene drinking straws (wall thickness testing)

Keywords: ISO 5424:2022, industrial compostable plastic drinking straws, compostability test methods, straw technical requirements, packaging and labelling, sampling plan, AQL 6.5.