Overview
ISO 22651:2002 is an international standard developed by the International Organization for Standardization (ISO) that specifies test methods for evaluating the dimensional stability of footwear insoles after water immersion. This standard applies to insoles made from any material and defines procedures to measure changes in dimensions-such as swelling, enlargement, and shrinkage-following exposure to water and heat. ISO 22651 ensures consistent, reliable assessments of insole quality and durability, which are critical in footwear manufacturing and quality control.
Key Topics
- Dimensional Stability Testing: ISO 22651 outlines methods to determine how insoles respond dimensionally to immersion in water and subsequent drying. It focuses on changes in thickness (swelling), length and width (enlargement), and shrinkage caused by heat exposure.
- Sample Preparation: The standard describes detailed sampling and conditioning steps, including cutting test specimens from insoles, conditioning them under controlled atmosphere conditions, and precise marking for measurements.
- Measurement Techniques: Using calibrated micrometers and vernier calipers, measurements are taken before and after immersion in distilled water and after drying in a thermostatically controlled oven at 35°C. The pressure applied during thickness measurement is standardized to ensure accuracy.
- Quantitative Results: The standard provides formulas to calculate swelling, enlargement, and shrinkage percentages based on comparative dimensional data, enabling objective evaluation of dimensional changes.
- Reporting Requirements: A comprehensive test report must include swelling, enlargement, and shrinkage results; detailed sample identification; sampling methods; test conditions; deviations or exceptions; and test dates.
Applications
- Footwear Manufacturing Quality Control: Ensuring insoles maintain their dimensions after exposure to moisture is crucial for comfort, fit, and performance. ISO 22651 aids manufacturers in verifying material properties and product quality.
- Material Research and Development: R&D teams use this standard to assess new insole materials or treatments and their resistance to deformation caused by water absorption.
- Compliance and Certification: Manufacturers seeking to meet international footwear standards or customer requirements use ISO 22651 testing to demonstrate product reliability and durability.
- Product Comparison and Selection: Retailers and designers use dimensional stability data to select insole materials that retain shape and size during use, enhancing overall customer satisfaction.
Related Standards
- EN 12800:2000: The European equivalent to ISO 22651, covering similar testing methods for insole dimensional stability, harmonized with ISO requirements.
- EN 12222 / ISO 18454: Defines standard atmospheric conditions for conditioning footwear and their components during testing to ensure reproducibility.
- prEN 13400 / ISO 17709: Provides guidelines for precise sampling locations on footwear components, including insoles, to standardize the representativeness of test specimens.
Keywords: ISO 22651, footwear insoles, dimensional stability, insole testing, swelling measurement, enlargement, shrinkage, water immersion test, footwear quality control, insole durability, international footwear standards.
