AS 2400, Part 18-1983

Original price was: $41.00.Current price is: $20.00.

SAA Packaging code, Part 18: Use of desiccants in packaging

File Format: PDF

Category:
Provides guidance on the use of desiccants in packaging to reduce humidity inside packages. Examples of calculation of quantity of desiccant required as well as notes on permeability and water-vapour transmission rate are given in appendices.

Header

About this publication

PREFACE

1 SCOPE

2 REFERENCED DOCUMENTS

3 DEFINITIONS

4 GENERAL

5 DESICCATED PACKAGES

5.1 General

5.2 Reduction of humidity within the pack

5.3 Sources of moisture

5.3.1 General

5.3.2 Air inside the barrier

5.3.3 Air outside the barrier

5.3.4 Hygroscopic materials inside the barrier

5.3.5 Entrapped water

6 FACTORS GOVERNING SELECTION OF DESICCANT

6.1 General

6.2 Moisture sorption capacity in relation to bulk and mass

6.3 Stability and physical form of the desiccant

6.4 Influence of the normal temperature range on the moisture sorption capacity of desiccants

6.5 Types of desiccants

7 FACTORS DETERMINING QUANTITY OF DESICCANT

7.1 General

7.2 The effect of atmospheric conditions

7.2.1 Humidity and water vapour pressure

7.2.2 Temperature

7.3 Period of exposure to adverse conditions

7.4 The nature of the barrier material

7.5 The surface area of the barrier

7.6 The thickness of the barrier

7.7 The volume of air inside the barrier

7.8 The quality of the seals

8 GENERAL PACKAGING CONSIDERATIONS

8.1 Conditions in use

8.2 Outline of procedure

APPENDIX A

A1 ACCURACY OF CALCULATION—ROUNDING UP OF CALCULATED QUANTITIES

A2 RELATIONSHIP OF COMMERCIAL DESICCANTS TO BASIC DESICCANT

A3 FORMULAS FOR CALCULATING QUANTITY OF BASIC DESICCANT

A3.1 General

A3.2 Where the barrier is not completely impervious to water-vapour

A3.2.1 When the period of protection, water-vapour transmission rate (WVTR) and atmospheric conditions are specified or can be estimated

A3.2.2 When nothing is known about the needed period of protection, the atmospheric conditions are not specified or the WVTR is unknown

A3.3 Where the barrier is completely impervious to water-vapour

A3.4 Where the seal of the barrier is suspect

APPENDIX B