EN ISO 17232:2025 – Leather: Determination of Heat Resistance of Patent Leather

Full title: Leather - Physical and mechanical tests - Determination of heat resistance of patent leather (ISO 17232:2025)

Published by: European Committee for Standardization (CEN), adopted from ISO

ICS Classification: 59.140.30 – Leather and furs

Purpose

EN ISO 17232:2025 specifies two standardized methods to evaluate the heat resistance of patent (varnished) leather. Both methods are suitable for all end-use patent leathers and intended for:

Routine quality control

Product development

Required Instruments and Equipment

Core Testing Instruments

Modified Lastometer – For Method A, with plunger and steel ball

Zwik Apparatus – For Method B, half-cylinder mandrel and clamps

Hot Air Blower / Heating Source – Capable of precise temperature control (±1 °C)

Timing Device – Stopwatch or timer, ±1 s accuracy

Specimen Holders / Clamps – To ensure proper stretching and positioning

Cutting and Perforation Tools – Press knife and sewing needle as specified

Auxiliary and Safety Equipment

Conditioning Chamber – Maintains temperature and humidity

Protective Gear – Gloves, lab coat, eye protection

Ventilation / Fume Extraction – Removes smoke or fumes generated during heating

Test Reporting

Reports must include:

Reference to EN ISO 17232:2025 and the method used

Test specimen identification and orientation

Heating temperature and duration

Damage before and after heating (e.g., cracking, crazing)

Conditioning atmosphere

Any deviations from standard procedure

Applications

Quality Control: Ensures patent leather finishes resist heat-induced damage

Product Development: Compare varnish systems, backing materials, or processing changes

Material Selection: For products exposed to elevated temperatures (footwear, vehicle interiors, displays)

Compliance Testing: Supports laboratory conformity assessment and regulatory verification

Related Standards

Standard Relevance

ISO 2418 Specimen position and preparation

ISO 2419 Specimen conditioning (physical and mechanical tests)

ISO 15115 / EN 15987 Leather vocabulary and terminology

EN ISO 17232:2017 Previous edition for historical comparison

Users of EN ISO 17232:2025

Leather manufacturers and finishers

Footwear, fashion, and upholstery brands

Accessory producers

Independent testing laboratories

Conformity assessment and certification bodies

Professional Testing Solutions

Qinsun Instruments specializes in leather testing instruments and provides complete solutions for EN ISO 17232:2025. Our equipment ensures reliable, precise, and safe assessment of heat resistance for patent leather in footwear, fashion, upholstery, and accessory applications.

For testing solutions or technical support, contact us today.

2026-01-04 16:30