ISO 1687-1976 rus PDF

Full title and description

St ISO 1687-1976 (Ст ISO 1687-1976) — "Sodium and potassium silicates for industrial use — Determination of density at 20 degrees C of products in solution — Method using density hydrometer and method using pyknometer". This is the original ISO International Standard (English text) published in 1976; “rus” in the title typically denotes a Russian-language reproduction or a Russian-language copy of the ISO text.

Abstract

Specifies two methods for determination of density at 20 °C for industrial sodium and potassium silicate products in solution: (1) a method using a density hydrometer, and (2) a method using a pyknometer (the pyknometer method is preferred in cases of dispute or for high-viscosity solutions). The standard describes apparatus, sampling/temperature control, test procedure and expression of results.

General information

• Status: Withdrawn.
• Publication date: March 1976 (Edition 1, 1976-03).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.060.50 (Silicates and related products; chemical analysis of silicates).
• Edition / version: Edition 1 (1976).
• Number of pages: 3 pages.

Basic bibliographic and lifecycle data are recorded in the ISO catalogue; national catalog entries show the standard as withdrawn (withdrawal recorded in some catalogues as 7 June 2002).

Scope

This standard applies to sodium and potassium silicate products supplied in solution and specifies procedures for determining density at 20 °C. It covers two laboratory methods (hydrometer and pyknometer), requirements for sampling and temperature control, and the recommended precision and expression of results for reporting density values of solutions used in industrial applications.

Key topics and requirements

• Two accepted measurement methods: hydrometer (rapid screening) and pyknometer (reference method, preferred for disputes or viscous samples).
• Temperature control requirement: measurements referenced to 20 °C (sample temperature between 19.5 °C and 20.5 °C recommended).
• Apparatus specified: measuring cylinder, series of density hydrometers covering the required range, pyknometer and calibrated balance.
• Precision guidance: reproducibility/precision stated (method precision example: about 0.02 g·ml⁻¹ for the hydrometer method, with finer reporting to 0.01 g·ml⁻¹ where practical).
• Result expression: density reported in g·ml⁻¹ at 20 °C, with indication of method used and any relevant sample preparation notes.

Typical use and users

Used historically by chemical producers, quality control laboratories, purchasers and users of industrial sodium and potassium silicate solutions (e.g., in detergents, silicate binders, water treatment, and specialty chemical manufacture) for acceptance testing, QC record-keeping and specification conformity. Laboratories performing routine QC or certification testing would apply the hydrometer method for throughput checks and the pyknometer method when higher accuracy or dispute resolution is required.

Related standards

ISO 1687 formed part of a family of ISO standards on sodium and potassium silicates (e.g., ISO 1686 — Samples and methods of test — General; ISO 1688, ISO 1689, ISO 1690, ISO 1691, ISO 1692 etc.). Many of the related technical test methods were published around 1976 under ISO/TC 47 (Chemistry). Note that the lifecycle of these related documents varies (some withdrawn, some confirmed or superseded).

Keywords

sodium silicate; potassium silicate; density; mass density; hydrometer; pyknometer; 20 °C; silicates — industrial use; ISO 1687; quality control.

FAQ

Q: What is this standard?

A: ISO 1687:1976 is an ISO International Standard that specified laboratory methods to determine the density at 20 °C of sodium and potassium silicate products in solution, using a density hydrometer and a pyknometer.

Q: What does it cover?

A: It covers sampling/temperature control, the hydrometer method (quick, routine checks) and the pyknometer method (reference method preferred for disputes and viscous solutions), apparatus and the expression of results (density at 20 °C).

Q: Who typically uses it?

A: Chemical manufacturers, QC and analytical laboratories, procurement/specification teams and process engineers working with industrial silicate solutions. Laboratories used the hydrometer for routine throughput checks and the pyknometer where greater accuracy was required.

Q: Is it current or superseded?

A: ISO 1687:1976 is withdrawn (ISO catalogue marks it as withdrawn). National catalogs indicate withdrawal actions (one recorded withdrawal date in national catalogs is 7 June 2002). Available bibliographic records do not list a direct replacement in the ISO catalogue.

Q: Is it part of a series?

A: Yes — it was published as part of a set of ISO methods for sodium and potassium silicates published in the mid‑1970s (ISO 1686, 1687, 1688, 1689, 1690, 1691, 1692, etc.), intended to cover sampling and common chemical test methods for these products.

Q: What are the key keywords?

A: Sodium silicate; potassium silicate; density at 20 °C; hydrometer; pyknometer; silicate test methods; ISO 1687.