ISO 10629:1996 PDF

Name: ISO 10629:1996 — Raw optical glass — Resistance to attack by aqueous alkaline solutions at 50 degrees C — Test method and classification
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Raw optical glass — Resistance to attack by aqueous alkaline solutions at 50 degrees C — Test method and classification

Название (английский):

ISO 10629:1996

Raw optical glass — Resistance to attack by aqueous alkaline solutions at 50 degrees C — Test method and classification

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 11 июля 1996 г.
Издание:: ISO IS 10629 edition 1 version 1
ICS:: 81.040.10

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Описание (английский):

La présente Norme internationale prescrit une méthode d'essai pour la résistance des verres d'optique bruts à l'attaque par des solutions aqueuses alcalines à 50 °C ainsi qu'une classification des verres d'optique conformément à leur résistance aux solutions aqueuses alcalines (résistance aux alcalins) déterminée à l'aide de cette méthode. La présente Norme internationale est applicable aux échantillons de tous verres d'optique bruts. NOTE 1 La méthode d'essai peut également être utilisée pour d'autres types de verres.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 10629:1996 specifies a standardized test method and classification for the resistance of raw optical glass to attack by aqueous alkaline solutions at 50 °C. The method measures mass loss and surface changes after exposure to a sodium hydroxide test solution and calculates the time required to etch a surface layer to a depth of 0.1 µm. Results are used to assign an alkali resistance (AR) class for optical glass.

Key topics and technical requirements

Test solution and conditions

Sodium hydroxide-based test solution (prepared from a 0.1 mol/l NaOH stock, diluted to the required concentration); pH controlled (carbonate-free) and held at 50.0 °C ± 0.2 °C.

Sample preparation

Typical sample dimensions: nominally 30 mm × 30 mm × 2 mm (annealed) with defined fine grinding and polishing procedures (cerium oxide polishing; control of rotation speeds, pressure and polishing time).

Apparatus and handling

Stainless-steel cylindrical test vessel with stirrer, thermostatic heating bath, analytical balance (±0.1 mg), ultrasonic cleaning, pH electrode, and inert sample supports (platinum/silver wires or cages).

Test procedure

Immersion sequences for unknown and known glasses (common exposure intervals: 0.25 h, 1 h, 4 h, 16 h), stirring at specified rates, single-use samples, and defined cleaning/drying protocol (ultrasonic cleaning, nitric acid rinse to pH 4.5, 2‑propanol).

Measurement and calculation

Determine mass loss (m1 − m2), measure density and surface area, then compute the time to etch 0.1 µm using the formula given in clause 8. Classification is based on computed time ranges.

Surface change notation

In addition to AR class, surface observations are recorded using codes (e.g., 0: no visible change; .1: pitting/waviness; .2: staining/interference colours; .3: tenacious whitish layer; .4: loose thick deposit/strong attack).

Test report

Must include reference to ISO 10629, sample ID and density, tested surface area, attack time used for calculation, number of samples, AR designation and any unusual observations.

Applications and users

Intended for manufacturers of optical glass, quality-control and testing laboratories, R&D teams, suppliers, and purchasers of raw optical glass.

Practical uses:

Specifying glass grades for lenses, prisms and optical components where chemical durability matters.
Comparing batches or formulations for alkali resistance.
Supporting material selection in optical instrument manufacturing and in environments where alkaline exposure is a concern.

Related standards

ISO 9802 (raw optical glass - vocabulary)

ISO 2768-1 (general tolerances)

ISO 3585 (borosilicate glass properties)

ISO 3696 (laboratory water specifications)

Keywords: ISO 10629:1996, raw optical glass, alkali resistance, test method, classification, sodium hydroxide, 50 °C, etch depth, mass loss, optical glass testing.

ISO 10629:1996 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

BS ISO 9802:2022

Raw optical glass. Vocabulary

SIST ISO 2768-1:1999

General tolerances -- Part 1: Tolerances for linear and angular dimensions without individual tolerance indic…

ISO 3585:1991

Borosilicate glass 3.3 — Properties

SIST EN ISO 3696:1998

Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)