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HOW TO DETERMINE YOUR DESICCITE 25
NEEDS
The number of
Desiccite 25 units required for your application depends on the type
and size of container you use, and the amount and type of product
and dunnage in that container.
One unit of Desiccite 25 which is approximately one ounce, will
adsorb at least 3 grams of water vapor at 20% relative humidity
and at least 6 grams of water vapor at 40% relative humidity, at
77 degrees F (25 degrees C).
USAGE FORMULA
To
determine the units of Engelhard Desiccite 25 activated mineral
desiccant necessary to protect a package, the following formulas
can be used as a guideline.
For
Flexible Barriers:
**Area Formula**
Square Feet x factor of 1.6
or
Square Inches x factor of 0.011
or
Square Meters x factor of 17
**
Example**
A barrier package whose sides measure 12" x 14"
12" x 14" x 2 sides x 0.011 = 336 Sq. In. x 0.011 = 3.70
Closest size would be a 4 unit bag
For
Ridge Metals Containers:
Volume Formula
Volume in gallons x factor of 1.161
or
Volume in cubic feet x factor of 1.2
or
Volume in cubic inches x factor of 0.0007
**
Example**
A 5-gallon can
5-gallons x 0.161 = .81
Closest size would be a 1 unit bag.
Round off the number of units
required to the next largest unit rather than the next lowest.
Chart
**Moisture Sealed Flexible Barriers ** |
** ** |
**Sealed Barrier Coated Fiber Drums* or Rigid **
Metal Containers |
**Area in**
Square Feet |
**Area in**
Square Inches |
**Units Desiccite 25**
Required |
**Volume in**
Gallons |
**Volume in**
Cubic Feet |
**Volume in**
Cubic Inches |
0.1
0.2
0.3
0.6
1.3
2.5
5.0
10.0
50.0 |
14
29
43
86
187
360
720
1440
7200 |
1/6
1/3
1/2
1
2
4
8
16
80 |
1.0
2.1
3.2
6.2
12.5
25
49.9
99.8
499.0 |
0.14
0.28
0.42
0.83
1.67
3.33
6.66
13.32
66.65 |
242
484
726
1,434
2,886
5,754
11,508
23,017
115,171 |
*With Gasketed Covers.
COMPENSATION FOR DUNNAGE
Additional Desiccite 25 is required to compensate for dunnage
(interior packing, cushioning, blocking, and bracing material).
**Dunnage Formula**
Dunnage weight in pounds x Dunnage type factor
**Dunnage Type Factors**
8
for hair, felt, wood, celluloseand other materials not described
below
6 for bound fibers
2 for glass fibers
0.5 for sythetic foam or rubber
**
Example**
Dunnage weight in pounds x Dunnage factor
1 oz./ 16 oz. X 8 (cellulose) - 0.5 units
One ounce of cellulose material as dunnage would require an
additional 1/2 unit. Adding 1/2 unit dunnage for the package
calculation (above) totals:
**
For a flexible barrier package** - 4 units + 0.5 units
= 4.5 units
Required for protection is 5 units (4 unit bag + 1 unit bag.)
**
For rigid metal container package** - 1 unit + 0.5 unit
= 1.5 units
Closest available size is a 2 unit bag.
Round off the number of units required to the next largest unit
rather than the next lowest.
Chart
**Hair Felt & Wood ** |
**Bound Fibers** |
**Glass Fibers** |
**Synthetic Foams**
& Rubber |
**Units Desiccite 25**
Required |
0.3 oz.
0.7 oz.
1.0 oz.
2.0 oz.
4.0 oz.
8.0 oz.
1 lb.
2 lb.
10 lb. |
** **0.4
oz.
.09 oz.
1.3 oz.
2.7 oz.
5.3 oz.
10.7 oz.
1.3 lb.
2.7 lb.
13.3 lb. |
** **1.3
oz.
2.7 oz.
4.0 oz.
8.0 oz.
1.0 lb.
2.0 lb.
4.0 lb.
8.0 lb.
40.0 lb. |
5.3 oz.
10.7 oz.
1 lb.
2 lb.
4 lb.
8 lb.
16 lb.
32 lb.
160 lb. |
1/6
1/3
1/2
1
2
4
8
16
80 |
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