ISO 10629-1996 PDF

Full title and description

ISO 10629:1996 — Raw optical glass — Resistance to attack by aqueous alkaline solutions at 50 degrees C — Test method and classification. This International Standard specifies a laboratory test method and a classification system for the alkali resistance of raw optical glasses (used to assign AR classes based on measured attack by alkaline solutions at 50 °C).

Abstract

Specifies a standardized procedure to evaluate the resistance of polished raw optical glass samples to attack by aqueous alkaline solutions at 50 °C and to classify glasses according to their alkali resistance. The test measures mass loss and surface effects after exposure (and uses the loss data to calculate the time required to etch a 0.1 μm surface layer), then assigns an AR class. The procedure, test solution composition and temperature control, sample preparation and classification tables are defined.

General information

• Status: Published (International Standard; confirmed in ISO records and under future revision work).
• Publication date: 1996 (published July 1996; edition 1).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 81.040.10 (Raw materials and raw glass / optical materials).
• Edition / version: Edition 1 (1996).
• Number of pages: 8 (as recorded in ISO bibliographic data).

Scope

Applies to samples of raw optical glass and prescribes a lab test at 50 °C using carbonate-free alkaline test solutions to determine chemical attack. The standard is intended to classify optical glasses by alkali resistance (AR classes) based on measured mass loss/etch depth; the method can also be applied to other glass types where alkali sensitivity is of interest.

Key topics and requirements

• Test solution: specified sodium hydroxide–based alkaline solution (carbonate-free) and preparation details.
• Temperature control: test performed at 50.0 °C with tight tolerance (specified in the standard).
• Sample preparation: defined sample size, polishing/grinding procedure and handling to ensure reproducible surface condition prior to test.
• Measurements: mass loss and surface observations; calculation of time to etch a 0.1 μm surface layer used for classification.
• Classification: assignment of alkali resistance (AR) classes (e.g., AR 1–4) according to measured results and tables in the standard.

Typical use and users

Used by optical-glass manufacturers, quality-control and process laboratories, glass suppliers, research institutions and anyone specifying or qualifying raw optical glass for applications where exposure to alkaline liquids (for instance in grinding, polishing or certain processing steps) could affect surface integrity or optical performance. Industry product datasheets often reference AR classes from ISO 10629 when indicating chemical-processing sensitivity.

Related standards

Closely related ISO standards from the same technical area (ISO/TC 172/SC 3) include ISO 8424 (resistance to aqueous acidic solutions — test methods and classification, updated 2023) and other optical-glass chemical-resistance and hydrolytic-resistance standards (for example ISO 719 / ISO 720 series for hydrolytic resistance). Newer or complementary ISO work items (e.g., ISO/AWI 10629) are in development to update or replace aspects of ISO 10629. These documents together form the chemical-resistance test and classification framework for optical glasses.

Keywords

ISO 10629, optical glass, alkali resistance, AR class, alkaline attack, sodium hydroxide test, chemical resistance, test method, optical materials, ISO/TC 172/SC 3.

FAQ

Q: What is this standard?

A: ISO 10629:1996 is an ISO International Standard that defines a laboratory test method and classification system to assess the resistance of raw optical glass to attack by aqueous alkaline solutions at 50 °C.

Q: What does it cover?

A: It covers sample preparation, the alkaline test solution and controlled test conditions (50 °C), measurement procedures (mass loss and surface effects), calculation of etch time to 0.1 μm and classification of glasses into alkali-resistance classes. The standard is aimed at polished plate-shaped raw optical glass samples but the method can be applied more broadly.

Q: Who typically uses it?

A: Optical-glass manufacturers and suppliers, QC and process labs in optics and photonics, materials researchers, and engineers specifying or qualifying glass for manufacturing steps that expose surfaces to alkaline liquids (for example grinding or polishing). Product datasheets for optical glasses sometimes report AR class values derived from this standard.

Q: Is it current or superseded?

A: ISO 10629:1996 is a published International Standard that has been confirmed in ISO records; ISO has an approved work item (ISO/AWI 10629) under development to revise or replace it, indicating an update process is in train. Users should check ISO metadata or national bodies for the very latest status when compliance to the newest edition is required.

Q: Is it part of a series?

A: It sits within the suite of ISO standards addressing chemical resistance and testing of optical glass (for example ISO 8424 on acid resistance and ISO 719/ISO 720 hydrolytic-resistance tests). These related standards together provide complementary chemical-resistance test methods and classification schemes for optical materials.

Q: What are the key keywords?

A: Optical glass, alkali resistance, AR class, alkaline attack, sodium hydroxide test, chemical resistance testing, ISO 10629, test method, classification.