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ISO 4794:1982 PDF — Laboratory glassware — Methods for assessing the chemical resistance… — GOST Standards

//ISO 4794:1982

ISO 4794:1982

Name: ISO 4794:1982 — Laboratory glassware — Methods for assessing the chemical resistance of enamels used for colour coding and colour marking
SKU: ISO 4794:1982
Price: 25 EUR
Availability: InStock

Laboratory glassware — Methods for assessing the chemical resistance of enamels used for colour coding and colour marking

Название (английский):

ISO 4794:1982

Laboratory glassware — Methods for assessing the chemical resistance of enamels used for colour coding and colour marking

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 4
Дата публикации:: 1 мая 1982 г.
Издание:: ISO IS 4794 edition 1 version 1
ICS:: 71.040.20

Тип поставки:

Full version25 €Ask AI2 €Read online 24h10 €Read online 72h15 €

Язык документа:

ruen

Срок поставки:1 рабочий день

Цена:25 €

Описание (английский):

Test methods for determining the service performance of enamels are specified, i.e. for determining whether an enamel resists the specified treatment. The procedure insolve treatment for specified periods with an alkine detergent at 80 degrees centigrade and a dilute acid solution at room temperature.

Abstract

Overview

Key topics and technical requirements

Scope: Tests focus on enamel used for colour coding/identification (e.g., pipette colour codes). The standard does not rank enamels by resistance level; it provides a reproducible method to determine if an enamel “resists the specified treatment.”
Reagents:
- Distilled or deionized water.
- Alkaline detergent: 50 g sodium pyrophosphate (Na4P2O7) + 5 g dodecylbenzene sulfonate per litre.
- Hydrochloric acid: c(HCl) = 2 mol·L−1 (analytical grade).
- Cold acetone (for rinsing).
Apparatus:
- 1 L beaker complying with ISO 3819.
- Watch glass, heating bath capable of maintaining 80 ± 1 °C.
- Inert sample holder, thermometer, closed containers and pure cellulose cleaning cloth.
Test procedures:
- Sample preparation: cut specimens including full enamel mark, leave ≥5 mm glass margin; wash three times in water and acetone; dry.
- Alkaline detergent test: immerse up to 10 samples in 700 ml detergent solution at 80 ± 1 °C for 120 ± 5 min, then rinse and dry.
- Acid test: immerse up to 10 samples in ~700 ml HCl solution at 23 ± 3 °C for 60 ± 5 min, then rinse and dry.
Acceptance criterion: enamel is satisfactory if no colour change occurs that would prevent correct identification or could cause confusion with another code colour (loss of gloss alone is not a failure).
Reporting: test report must record lot/delivery description, enamel colour, number of samples, results for each test, any re-tests and date.

Applications and who uses it

Quality control labs and manufacturers of laboratory glassware use ISO 4794 to verify the durability of enamel colour coding and identification marks.
Procurement and testing departments in research institutes, clinical labs, and educational labs apply these methods when specifying or validating glassware markings.
Standards bodies and conformity assessors use the method to produce consistent, comparable test data for enamel resistance.

Related standards

ISO 1769 - Laboratory glassware - Pipettes - Colour code (reference to colour-coded pipettes).
ISO 3819 - Laboratory glassware - Beakers (used for test beaker specifications).

Keywords: ISO 4794:1982, laboratory glassware, enamel chemical resistance, colour coding, colour marking, alkaline detergent test, hydrochloric acid test, enamel durability.

Технические детали

Технический комитет: ISO/TC 48 - Laboratory equipment
SKU: ISO 4794:1982

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PDF

ISO 4794:1982

Abstract

Overview

Похожие стандарты

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

ISO 3819:2015

Laboratory glassware — Beakers

ISO 17690:2015

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ISO 8212:1986

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ISO 20662:2020

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ISO 3021:2023

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ISO 3826-2:2008

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ISO/IEC 24730-1:2014

Information technology — Real-time locating systems (RTLS) — Part 1: Application programming interface (API)

ISO 8668-5:1992

Aircraft — Terminal junction systems — Part 5: Detail specification for type 3 system