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Desiccant Standards

BS 2540:1991 Granular desiccant silica gel
Specification includes:
Moisture Content 2% maximum
Adsorptive capacity 27% min. at 50% RH and 25C
BS 7554:1992 Beaded desiccant silica gel
Specification includes:
Moisture Content 2% maximum
Adsorptive capacity 27% min. at 50% RH and 25C
BS 3523:1991 Granular desiccant silica gel impregnated with cobalt chloride
Specification includes:
Moisture Content 2% maximum
Adsorptive capacity 23% min. at 50% RH &25C
PACKING CODE
BS 1133 Section 19:1986
Use of Desiccants in Packing

This includes the definition for BASIC DESICCANT: 'capable of absorbing 27% moisture on its' dry mass at 50% RH and 25C' This ties up with BS 2540:1991 above.

It goes on to say 'desiccant activated clay to TS 487 (now superseded see below) will only absorb 20% of moisture of its' dry mass, therefore to comply with the basic desiccant concept must be filled with 27:20 (1.35 times) the quantity'

BS 7529:1991 Desiccant Activated Clay
Specification includes:
Moisture Content 2% maximum
Adsorptive capacity 20% min. at 50% RH &25C
This specification superseded TS 487

 

DESICCANT UNITS

This description is favoured by the European and American specifications.

DIN 55 473 German Specification
This defines similarly
At 23 +/- 2C min. 3.00 grams at 20% RH
min. 6.00 grams at 40% RH

With Desiccant Units this means that different desiccants can be used and compared directly (e.g. for cost). Different weights are required for different desiccants to give a Desiccant Unit.

By comparing the Desiccant Unit specification with the BS specifications 25 grams of Silica Gel to BS 2540:1991 and 33 grams of desiccant activated Clay to BS 7529:1991 can be considered as 1 Desiccant Unit

DEF STAN 81-68 Issue 4 (2008)

The Ministry Of Defence Specification

This uses grams not units and distinguishes between silica gel and activated clay.

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