Determination of the specific surface area of powders Recommended air permeability methods

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-12-1982

Publisher

British Standards Institution

Foreword
Cooperating organizations
Methods
0 Introduction
1 Scope
2 Definitions
3 Symbols
4 Principles
5 Apparatus: general
6 Preparation of the powder bed
7 Measurement of permeability
8 Variables affecting the result
9 Reporting
Appendices
A Measurement of the effective solid density of a
   powder
B Lea and Nurse constant flow rate method
C Fisher sub-sieve sizer constant flow rate method
D Rigden constant volume method
E Blaine constant volume method
F Test for bed uniformity
G Sources of reference materials for air permeability
   measurements
Tables
1 Variation of air viscosity with temperature
2 Density of pure water, rho w
3 Indicated diameter correction factors for a sample
   volume v1 of 1.25 cm3
Figures
1 Permeability cells
2 Lea and Nurse apparatus with pressure drop flowmeter
3 Schematic diagrams of Fisher sub-sieve sizer and
   sample tube
4 Rigden apparatus
5 Blaine apparatus

Describes four commonly used methods for determining the permeability surface area of powders.

This Part of this British Standard describes recommended methods for determining the permeability surface area of powders by measuring the resistance offered to the flow of air through a compacted bed of the powder.

The methods are applicable to powders with permeability volume specific surfaces in the range 2 × 10⁴ m²/m³ to 5 × 10⁷ m²/m³.

Four specific methods are described in appendices B to E.

Use of the permeability methods is precluded when:

agglomerates are not easily broken down (unless the specific surface area required is that of the agglomerated form);
the particles fracture or undergo deformation when the powder bed is being compacted.

NOTE. The titles of the publications referred to in this standard are listed on the inside back cover.

Committee	LBI/37
DevelopmentNote	Supersedes 81/70580 DC (08/2005) Reviewed and confirmed by BSI, November 2012. (10/2012)
DocumentType	Standard
Pages	24
PublisherName	British Standards Institution
Status	Current
Supersedes	BS 4359-2:1971

DEFSTAN 13-71/3(2013) : 2013	CHROMIUM (3) OXIDE
DEFSTAN 13-128/2(2013) : 2013	BORON, AMORPHOUS, GRADES 1 AND 2
STANAG 4300 : 0	TEST PROCEDURES FOR ASSESSING THE QUALITY OF ALUMINIUM POWDER, FOR USE IN EXPLOSIVE FORMULATION, FOR DELIVERIES FROM ONE NATO NATION TO ANOTHER
DEFSTAN 13-159/1(1994) : 1994	COMPOSITION SR 58
DEFSTAN 13-52/3(2012) : 2012	BISMUTH (3) OXIDE
BS 3406-1:1986	Methods for determination of particle size distribution Guide to powder sampling
BS 4359-1:1984	Determination of the specific surface area of powders Recommendation for gas adsorption (BET) methods
BS 6463-4:1987	Quicklime, hydrated lime and natural calcium carbonate Methods of test for physical properties of hydrated lime and lime putty
BS 8439:2005	Continuous handling equipment and systems. Guide to properties of powders and bulk materials
BS 6463-103:1999	Quicklime, hydrated lime and natural calcium carbonate Methods for physical testing

BS 2955:1958	Glossary of terms relating to powders
BS 3406-1:1961	Methods for determination of particle size distribution Sub-division of gross sample down to 0.2 ml

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BS 4359-2:1982

Determination of the specific surface area of powders Recommended air permeability methods

Table of Contents

Abstract

Scope

General Product Information

Standards Referenced By This Book

Standards Referencing This Book

Category

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