ISO 5999:2013

Overview

ISO 5999:2013 specifies requirements for flexible cellular polymeric materials - specifically polyurethane foam of the polyether type - intended for load‑bearing applications (comfort cushioning). The standard covers foams manufactured in block, sheet and strip form, in moulded and fabricated shapes, and as reconstituted material. It expressly excludes carpet backing and underlay. ISO 5999:2013 focuses on material quality, performance classification and test methods relevant to durability, hardness and safety for cushioning uses.

Key topics and technical requirements

• Scope and material type
  • Applies to flexible polyether polyurethane foam for load‑bearing cushioning.
  • Formats covered: block, slabstock, contour cut, moulded, fabricated, reconstituted.
• Classification
  • By Type (e.g., block, moulded, reconstituted) and Class (fatigue performance).
  • Five fatigue classes: X (exceptionally severe), V (very severe), S (severe), A (average), L (light), defined by hardness loss ratio after a constant‑load pounding test.
  • Grade by indentation hardness index (ISO 2439) - examples: 30, 50, 70 … up to 600 N ranges.
• Performance and physical requirements
  • Open‑cell structure, freedom from defects that affect performance.
  • Requirements for density, dimensions, hardness (indentation), resilience (ball rebound), compression set, tensile strength and elongation.
  • Burning behaviour and ageing properties are specified and tested.
• Test methods
  • Normative references include ISO test methods such as ISO 3385 (fatigue by constant‑load pounding), ISO 2439 (hardness), ISO 845 (density), ISO 1798 (tensile/elongation), ISO 3582 / ISO 3795 (burning behaviour), ISO 8307 (resilience) and others.

Applications and practical use

ISO 5999:2013 is aimed at materials used for comfort cushioning and load‑bearing applications, such as:

• Furniture and mattress components
• Seating pads and cushions for transportation or commercial seating
• Molded and fabricated cushioning parts where fatigue performance and comfort are critical

The standard helps manufacturers, product designers and specifiers ensure foam meets durability, hardness and safety expectations for end‑use comfort applications.

Who should use this standard

• Foam manufacturers and formulators (quality control and product specification)
• Product designers and OEMs (furniture, bedding, transportation interiors)
• Test laboratories and quality engineers (type and shipping inspection)
• Procurement and compliance teams specifying material performance

Related standards

Relevant normative references include: ISO 2439, ISO 3385, ISO 845, ISO 1798, ISO 1856, ISO 2440, ISO 3582, ISO 3795, ISO 8307, ISO 1923, ISO 23529 - these provide the specific test methods and conditioning procedures cited by ISO 5999:2013.

Keywords: ISO 5999:2013, polyurethane foam, flexible cellular polymeric materials, polyether foam, load‑bearing, indentation hardness, fatigue classes, compression set, resilience, burning behaviour.