ISO 10349-11-1992 PDF

Full title and description

Photography — Photographic-grade chemicals — Test methods — Part 11: Determination of specific gravity. This International Standard specifies a laboratory test method for determining the specific gravity (relative density) of solutions used in photographic processing; the measurement is performed with a hydrometer after the test portion has reached thermal equilibrium at a reference temperature.

Abstract

Specifies a method for determining the specific gravity (relative density) of photographic processing solutions by means of a hydrometer capable of measuring density to 0,001 units. The test calls for the sample to be brought to thermal equilibrium (reference temperature 25 °C) in a water-bath before reading. Results are reported as specific gravity (relative density).

General information

• Status: Published (International Standard; confirmed on review).
• Publication date: 30 December 1992 (ISO publication: December 1992).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 37.040.30 (Photography; photographic chemicals).
• Edition / version: Edition 1 (1992).
• Number of pages: 2.

Scope

This part of ISO 10349 specifies the procedure for measuring the specific gravity of photographic-grade chemical solutions used in processing photographic materials. The method is applicable to liquid photographic-processing solutions where specific gravity is a relevant quality or control parameter; it is performed using a calibrated hydrometer and strict temperature control (thermal equilibrium at 25 °C). The standard is one part of the ISO 10349 series of test methods for photographic-grade chemicals.

Key topics and requirements

• Hydrometer method for specific gravity (relative density) measurement with an instrument resolution of 0,001 units.
• Requirement that the test portion be brought to thermal equilibrium in a water-bath at the reference temperature (25 °C) prior to reading.
• Sample-handling and temperature-control procedures to ensure repeatability and comparability of results.
• Reporting of results as specific gravity (relative density) and identification of any deviations from the stated method.
• Placement within the ISO 10349 series — users are directed to ISO 10349‑1 for general requirements and reporting conventions.

Typical use and users

Analytical and quality-control laboratories in the photographic-chemical and photographic-materials industries; manufacturers and suppliers of photographic-grade chemicals; conservation and archival laboratories that process or evaluate photographic materials; standards organizations and testing bodies performing method validation or inter-laboratory comparisons.

Related standards

Other parts of the ISO 10349 series (general requirements and additional test methods) are directly related, notably ISO 10349-1 (General — test method conventions and reagent criteria) and other numbered parts covering specific analyses (for example halide-content and related determinations). Users should consult ISO 10349-1 for reporting, reagents and common procedural requirements.

Keywords

specific gravity; relative density; hydrometer; photographic-grade chemicals; photographic processing solutions; ISO 10349; test method; temperature control; quality control.

FAQ

Q: What is this standard?

A: ISO 10349-11:1992 is an International Standard titled "Photography — Photographic-grade chemicals — Test methods — Part 11: Determination of specific gravity" that describes a laboratory procedure to measure the specific gravity of photographic processing solutions.

Q: What does it cover?

A: It covers the hydrometer-based procedure for determining relative density (specific gravity) of photographic solutions, including the requirement that samples reach thermal equilibrium at 25 °C before measurement and the expected instrument resolution (0,001 units).

Q: Who typically uses it?

A: Analytical and quality-control laboratories, chemical and photographic manufacturers and suppliers, conservation labs, and standards bodies involved in testing and specifying photographic-grade chemicals.

Q: Is it current or superseded?

A: The published 1992 edition (Edition 1) is recorded as published in December 1992 and, according to ISO lifecycle information, the record of the publication has been reviewed/confirmed in subsequent reviews. Users should check the ISO catalogue or their national standards body for any later revisions or replacements before relying on the text for regulatory or contract purposes.

Q: Is it part of a series?

A: Yes — it is Part 11 of the ISO 10349 series, which comprises test methods for photographic-grade chemicals; consult ISO 10349-1 for general provisions and the other numbered parts for additional specific tests.

Q: What are the key keywords?

A: Specific gravity, relative density, hydrometer, photographic chemicals, test method, ISO 10349.