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ISO 4793:1980 PDF — Laboratory sintered (fritted) filters — Porosity grading, classificat… — GOST Standards

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ISO 4793:1980

Name: ISO 4793:1980 — Laboratory sintered (fritted) filters — Porosity grading, classification and designation
SKU: ISO 4793:1980
Price: 25 EUR
Availability: InStock

Laboratory sintered (fritted) filters — Porosity grading, classification and designation

Название (английский):

ISO 4793:1980

Laboratory sintered (fritted) filters — Porosity grading, classification and designation

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 1 октября 1980 г.
Издание:: ISO IS 4793 edition 1 version 1
ICS:: 71.040.20

Тип поставки:

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

Язык документа:

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Срок поставки:1 рабочий день

Цена:25 €

Описание (английский):

Filters are graded according to their pore size index in one of the eight classes specified. This is applicable to laboratory filters made of glass, vitreous silica, ceramics, metals and plastic materials. Annex A specifies a method for determination of pore size index. Annex B and C concern with a procedure for assessing uniformity of filters and for determination of air permeability.

Abstract

Overview

Key topics and requirements

Porosity grading and designation: Filters are assigned to one of eight classes. The grade designation uses the letter P followed by the upper limit of the pore size index in micrometres (for example, P16).
Pore size index (Annex A): A bubble-pressure method measures the air pressure at which the first air bubble breaks free from a wetted filter; this pressure is converted to an equivalent pore size index. The method specifies choice of test liquids (e.g., water, isopropanol, lower surface‑tension liquids) and precautions for wettability and chemical reactivity.
Uniformity assessment (Annex B): After the initial bubble-pressure reading, the filter can be checked for uniform pore distribution across the working area by increasing pressure and observing bubble emergence across the surface.
Air permeability (Annex C): A flow measurement at a specified pressure differential (e.g., 1 mbar) determines permeability. The standard provides methods to calculate air flow per unit area and requires minimum permeability values by grade (see Annex C / Table 2).
Quality expectations: Filters must not shed particles under normal use and should withstand a working pressure differential of 1.013 bar. Manufacturers are recommended to aim for pore size indexes near the centre of each grade range.

Applications

ISO 4793:1980 is used to:

Select appropriate fritted laboratory filters for sample preparation, filtration and analytical workflows.
Define acceptance criteria and quality control tests for production of sintered filters (glass, ceramic, metal, plastic).
Specify filter performance (pore size index, uniformity, permeability) in procurement documents and technical datasheets.
Support laboratory equipment manufacturers and filtration accessory suppliers in consistent product classification.

Who should use this standard

Laboratory managers and analytical chemists specifying filtration media
Manufacturers of laboratory glassware and sintered/fritted filters
Quality control and R&D teams developing porous filtration products
Purchasers and procurement specialists preparing technical specifications

Related standards

Refer to other ISO standards covering laboratory glassware, porous materials and test methods for fluid flow and filtration for complementary requirements and more detailed test procedures.

Технические детали

Технический комитет: ISO/TC 48 - Laboratory equipment
SKU: ISO 4793:1980

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ISO 4793:1980

Abstract

Overview

Похожие стандарты

Key topics and requirements

Applications

Who should use this standard

Related standards

Технические детали

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ISO 8668-5:1992

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