Overview
EN ISO 3386-2:1998 defines the standardized method for determining the compression stress-strain characteristics of flexible cellular polymeric materials with high density (above 250 kg/m³). This essential International Standard, developed by ISO Technical Committee TC 45 (Rubber and rubber products), provides a reliable procedure for testing the load-bearing properties of dense flexible cellular materials, such as expanded cellular rubbers, under compressive forces.
Unlike indentation hardness tests, this method specifically measures compression behavior as a function of deformation, which is critical for evaluating material performance under compression stresses relevant to practical applications. It is complementary to Part 1 of the ISO 3386 series, which covers low-density materials.
Key Topics
- Scope: Specifies testing for high-density flexible cellular polymers exceeding 250 kg/m³, with optional use from 150 kg/m³ for comparison.
- Test Material: Flexible cellular polymeric materials, including expanded cellular rubbers.
- Test Specimen: Right parallelepiped shape with square load-bearing faces of minimum 40 mm side and thickness with a width-to-thickness ratio of 4:1.
- Test Conditions: Conditioning at controlled temperature (23°C or 27°C) and relative humidity for at least 16 hours right before testing.
- Test Procedure:
- Compression at a uniform rate of 5 ± 1 mm/min.
- Measurement during the fourth loading cycle.
- Calculation of compression stress in kilopascals using force and load-bearing area.
- Shape Factor: Defined as the ratio between the load-bearing face area and the sum of the side areas; shape affects test comparability.
- Accuracy Requirements: Force measurements within ±2%, thickness measurements within ±0.1 mm.
- Test Report: Includes test standard reference, material description, test conditions, specimen dimensions, and compression stress-strain results.
Applications
This standard is crucial for manufacturers, engineers, and quality control professionals involved in the development, testing, and certification of high-density flexible cellular polymer materials used in:
- Automotive seating and cushioning systems where compressive durability is required.
- Building and construction for insulation and vibration dampening materials.
- Medical devices such as cushioning and support pads.
- Furniture and mattresses where load-bearing comfort and resilience are critical.
- Protective packaging materials requiring durable compression resistance.
- Any industrial product requiring defined load-bearing properties of flexible cellular polymers.
By following EN ISO 3386-2, stakeholders ensure consistent and reproducible measurements of compression behavior, facilitating reliable comparisons between materials and compliance with safety and performance requirements.
Related Standards
- EN ISO 3386-1: Flexible cellular polymeric materials - Compression stress-strain characteristics for low-density materials (≤ 250 kg/m³).
- ISO 2439: Determination of hardness of flexible cellular materials by indentation technique.
- ISO 1923: Determination of linear dimensions of cellular plastics and rubbers.
- Other ISO Rubber Standards: Various standards under ISO/TC 45 relevant for testing rubber and polymer products.
Adopting this standard along with related ISO standards ensures comprehensive characterization of flexible cellular polymers, covering key mechanical and physical properties pertinent to product design and quality assurance.
Keywords
Flexible cellular polymeric materials, compression test, stress-strain characteristics, high-density polymer foam, EN ISO 3386-2, flexible cellular rubbers, load-bearing properties, compression strain measurement, material testing standard, polymer foam compression, ISO test methods, rubber and plastic testing, material quality control.