Unit-Size Desiccant Chart

Desiccant is sold in unit size bags according to Mil-D-3464E. A unit is the amount of desiccant which will adsorb at least 3 grams of moisture vapor at 20% relative humidity, and at least 6 grams of moisture vapor at 40% relative humidity at 25°C.

If the container you need to protect is 950cc or less in volume, a gram-size desiccant requirement chart is available here.

We also have a calculator which will give an estimate of the number of units of Clay or Silica Gel desiccant required for any size Moisture Barrier Bag. Desiccant Estimator

The amount of desiccant/adsorbent required will depend upon the chemical characteristics of the product as well as the volume contents and physical properties of the container. We recommend a stability study be performed to determine exact amounts required. Samples available upon request.

Container Size to Amount of Desiccant Units Required

Moisture Sealed Flexible Barriers		Sealed Barrier Coated Fiber Drums or Rigid Metal Containers			Recommended Units of DESI-PAK
Square Feet	Square Inches	Gallons	Cubic Feet	Cubic Inches
0.1	15	1.1	0.14	237	1/6
0.2	30	2.1	0.28	476	1/3
0.3	45	3.2	0.42	714	1/2
0.6	90	6.2	0.83	1,428	1
1.3	180	12.5	1.67	2,856	2
1.9	270	18.7	2.5	4,284	3
2.5	360	25	3.33	5,712	4
3.1	450	31.2	4.16	7,140	5
3.8	540	37.4	5	8,568	6
4.4	630	43.6	5.83	9,996	7
5	720	50	6.66	11,424	8
5.6	810	56.1	7.5	12,852	9
6.3	900	62.3	8.33	14,280	10
7.5	1,080	74.8	10	17,136	12
8.8	1,260	87.3	11.66	19,992	14
10	1,440	99.7	13.32	22,850	16
20	2,880	199.4	26.64	45,700	32
50	7,200	498.5	66.65	114,250	80
100	14,400	997	133.3	228,500	160
120	18,000	1240	166	285,600	200
150	22,500	1550	207	357,000	250

 

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