Overview
ISO 1887:2014 - Textile glass - Determination of combustible‑matter content specifies a laboratory method to quantify the combustible‑matter content (e.g., organic size or finish) of products made from textile glass. The method applies to continuous‑filament yarns, staple‑fibre yarns, rovings, chopped strands, milled fibres, fabrics, mats and other glass reinforcements. Results are expressed as a percentage of the dried product mass removed by calcination.
Keywords: ISO 1887:2014, textile glass testing, combustible matter, calcination, muffle furnace, drying oven, glass reinforcements.
Key technical topics and requirements
- Principle: Weigh dried specimens, calcine in a muffle furnace, and calculate the mass loss (combustible‑matter content) as a percentage of the dried specimen.
- Temperature conditions:
- Typical calcination: 625 °C ± 20 °C.
- For temperature‑sensitive glass types: 500–600 °C, by agreement.
- Drying oven: 105 °C ± 5 °C (lower temperature by agreement for volatile components).
- Apparatus: air‑circulation drying oven, muffle furnace (±20 °C control), desiccator, specimen holder (porcelain crucible or stainless‑steel gauze basket), tongs, balance accurate to 0.1 mg, cutting tools and templates.
- Specimen selection & mass:
- Yarn lengths vary with linear density (tex).
- Chopped strands/milled fibres: ≥ 5 g (preferably 15–30 g).
- Fabrics/mats: specimens of area ≈ 0.1 m² or pieces giving ≥ 5 g.
- Number of specimens defined (e.g., 3 fabric/mat specimens per metre of width).
- Procedure: stabilize holder mass, dry specimens to constant mass, calcine with initial open‑door burn (to vent volatiles), continue heating, cool in desiccator, and repeat until constant mass is achieved.
- Expression of results: combustible‑matter content H = (mass_loss / dried_mass) × 100; report to two decimal places.
- Precision: inter‑laboratory precision not yet available; a precision statement is to be added in a subsequent revision.
Practical applications and users
ISO 1887:2014 is used by:
- Quality control and materials testing laboratories for textile glass and glass‑reinforced products.
- Manufacturers and suppliers of glass fibre yarns, fabrics and mats to verify size/finish content.
- Composite fabricators and converters who require consistent surface treatments for resin compatibility.
- R&D teams assessing cleaning, sizing, or finishing processes.
- Regulatory bodies and purchasers requiring standardized test data for specifications and acceptance.
Related standards and context
- Prepared by ISO/TC 61/SC 13 (Composites and reinforcement fibres).
- This edition revises and replaces ISO 1887:1995. Future revisions will include inter‑laboratory precision data.
For procurement, conformity checks and process control of glass textile finishes, ISO 1887:2014 provides a repeatable, standardized calcination test method.
