ISO 641:1975 PDF

Name: ISO 641:1975 — Laboratory glassware — Interchangeable spherical ground joints
SKU: ISO 641:1975
Price: 25 EUR
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Laboratory glassware — Interchangeable spherical ground joints

Название (английский):

ISO 641:1975

Laboratory glassware — Interchangeable spherical ground joints

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 1 сентября 1975 г.
Издание:: ISO IS 641 edition 1 version 1
ICS:: 71.040.20

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Описание (английский):

The requirements deal with the geometric charateristics to ensure interchangeability. The dimensions of the joint-ground zone and the outer diameter of the tube connected to the joint are given in a table and illustrated in a drawing. In addition the surface finish is specified. A system of gauges (stell balls) for testing the ball cup is tabled. In the annex a method of testing the leakage including the apparatus is described.

Abstract

Похожие стандарты

Другие стандарты ISO

Overview

ISO 641:1975 - Laboratory glassware - Interchangeable spherical ground joints specifies the geometric and surface requirements for spherical ground glass joints used in laboratory glassware to ensure interchangeability regardless of manufacturer. The standard defines dimensional tables and tolerances for joint zones and adjacent tube diameters, a conventional designation system (letter S + nominal spherical diameter in mm), surface finish limits, gauging methods, and an annexed leakage test procedure including apparatus.

Key topics and requirements

Dimensional specifications and tolerances

Nominal spherical sizes (S7 to S102) with maximum/minimum diameters for male (sphere) and female (cup) elements.
Limits for the large and narrow ends of the ground zone and the maximum outer diameter of the adjacent tube (to aid clamp compatibility).

Designation

Conventional size marking: “S” followed by approximate spherical diameter in millimetres (e.g., S19).

Surface finish

Ground surface roughness specified; numeric Ra value must not exceed 1 µm and preferably be less than 0.5 µm (see ISO/R 468 reference).

Gauging and inspection

Use of gauge balls (steel calibrating balls) with specified diameters to check female elements (table provided).
Mechanical metrology methods (including pneumatic gauges) recommended to verify dimensional tolerances.

Leakage testing (Annex A)

Dry-assembly vacuum test: apparatus description for a ~1.5 L system, mercury manometer range and measurement procedure.
Cleaning procedure before test (solvent wipe-example: cyclohexane-drying, brush to remove particles).
Acceptance leak rates: for sizes S13 and smaller, pressure rise ≤ 930 Pa/min; for sizes S19 and larger, ≤ 2 kPa/min.

Illustrations and tables

Figure showing joint dimensions and tables mapping sizes, tolerances and gauge ball diameters.

Practical applications

Ensures interchangeability of spherical ground joints across laboratory glassware (distillation, reflux, reaction assemblies, condensers).

Helps manufacturers produce compatible glass joints that fit standard clamps and mating parts.

Guides quality control and inspection in glassware production and calibration laboratories.

Useful for laboratory managers and purchasing agents specifying standard-compliant replacement parts.

Related standards

ISO/R 383 (conical ground joints) - related joint interchangeability guidance

ISO/R 468 - surface roughness terminology and measurement

Keywords: ISO 641:1975, laboratory glassware, spherical ground joints, interchangeable joints, surface finish, leakage test, gauge balls, joint dimensions, S-series designation.

ISO 641:1975 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Practical applications

Who uses this standard

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