Dry Packs | McMaster-Carr

	Desiccant Material Desiccant Material

Silica Gel

Clay

Anhydrous Calcium Sulfate

Aluminosilicate

Starch/Calcium Chloride

Calcium Chloride

Starch

	For Area For Area

	Width Width

	Length Length

	Removal Capacity Removal Capacity

Up to 18% of desiccant
weight

Up to 32% of desiccant
weight

Up to 6% of desiccant weight

Up to 20% of desiccant
weight

Up to 30% of desiccant
weight

Up to 280% of desiccant
weight

Up to 150% of desiccant
weight

	Weight Weight

	Absorption Indicator Absorption Indicator

Yes

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Bag Material Bag Material

Fabric

Paper

Polyester

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Humidity Points Humidity Points

	Specifications Met Specifications Met

MIL-I-8835

SAE AS26860 Type 2

	Height Height

5/8"

4 3/4"

	Indicator Style Indicator Style

Pie

Spot

	For Hole Diameter For Hole Diameter

1.05"

1 27/64"

1.45"

	Thread Type Thread Type

NPSM

UNEF

	Minimum Dew Point Minimum Dew Point

-22° F

-30° C

	Maximum Indoor Temperature Maximum Indoor Temperature

60° C

140° F

	Scale Scale

Celsius

Fahrenheit

	Temperature Resolution Temperature Resolution

1° F

1° C

	Dew Point Accuracy Dew Point Accuracy

±3.6° F

±2° C

	Environment Environment

87 Products

Desiccant Bags

Remove moisture from sealed containers during shipping and storage.

These desiccants are best when relative humidity is at least 40%. The area covered is calculated at 77° F and 40% relative humidity.

Small Pack
For Area, cu. in.	Removal Capacity	Lg.	Wd.	Wt., oz.	Bag Material	Pkg. Qty.		Pkg.
Silica Gel
6	Up to 32% of desiccant weight	1 3/8"	3/4"	0.04	Tyvek	10	0000000	00000
24	Up to 32% of desiccant weight	1 3/4"	1"	0.11	Tyvek	10	0000000	0000
235	Up to 32% of desiccant weight	2 3/4"	1"	0.21	Tyvek	10	0000000	0000
1,425	Up to 32% of desiccant weight	6"	1 1/2"	1	Tyvek	5	0000000	0000
2,850	Up to 32% of desiccant weight	6"	5"	2	Tyvek	5	0000000	00000
5,700	Up to 32% of desiccant weight	7 1/8"	5"	4	Tyvek	2	0000000	00000
11,425	Up to 32% of desiccant weight	8 1/2"	5"	8	Tyvek	2	0000000	00000
22,850	Up to 32% of desiccant weight	9 1/4"	7 1/2"	16	Tyvek	1	0000000	00000
Clay
2	Up to 18% of desiccant weight	1"	5/8"	0.01	Tyvek	400	0000000	00000
9	Up to 18% of desiccant weight	1 1/2"	7/8"	0.04	Tyvek	250	0000000	00000
30	Up to 18% of desiccant weight	2 1/4"	7/8"	0.11	Tyvek	125	0000000	00000
235	Up to 18% of desiccant weight	3 1/8"	7/8"	0.21	Tyvek	50	0000000	00000
715	Up to 18% of desiccant weight	2 7/8"	2 1/8"	0.58	Tyvek	75	0000000	00000
1,425	Up to 18% of desiccant weight	4 1/2"	3"	1.16	Tyvek	50	0000000	00000
2,850	Up to 18% of desiccant weight	4 1/2"	5"	2.33	Tyvek	25	0000000	00000
5,700	Up to 18% of desiccant weight	7"	6"	4	Polyester	12	0000000	00000
11,425	Up to 18% of desiccant weight	8 1/4"	4 1/2"	9.31	Tyvek	7	0000000	00000
22,850	Up to 18% of desiccant weight	11"	4 1/2"	18.62	Tyvek	3	0000000	00000
Anhydrous Calcium Sulfate
1,300	Up to 6% of desiccant weight	1"	2 1/4"	0.11	Paper	25	0000000	0000
2,600	Up to 6% of desiccant weight	1"	2 3/4"	0.21	Paper	25	0000000	00000
12,275	Up to 6% of desiccant weight	4"	3 3/4"	1	Paper	25	0000000	00000
24,525	Up to 6% of desiccant weight	4 3/4"	3 3/4"	2	Paper	20	0000000	00000
49,075	Up to 6% of desiccant weight	6 1/4"	3 3/4"	4	Paper	10	0000000	00000
98,150	Up to 6% of desiccant weight	6 1/4"	5 3/4"	8	Paper	5	0000000	00000
Large Pack
Silica Gel
6	Up to 32% of desiccant weight	1 3/8"	3/4"	0.04	Tyvek	1,000	0000000	00000
24	Up to 32% of desiccant weight	1 3/4"	1"	0.11	Tyvek	400	0000000	00000
235	Up to 32% of desiccant weight	2 3/4"	1"	0.21	Tyvek	250	0000000	00000
1,425	Up to 32% of desiccant weight	6"	1 1/2"	1	Tyvek	300	0000000	000000
2,850	Up to 32% of desiccant weight	6"	5"	2	Tyvek	150	0000000	000000
5,700	Up to 32% of desiccant weight	7 1/8"	5"	4	Tyvek	100	0000000	000000
11,425	Up to 32% of desiccant weight	8 1/2"	5"	8	Tyvek	50	0000000	000000
22,850	Up to 32% of desiccant weight	9 1/4"	7 1/2"	16	Tyvek	30	0000000	000000
Clay
2	Up to 18% of desiccant weight	1"	5/8"	0.01	Tyvek	2,500	0000000	00000
9	Up to 18% of desiccant weight	1 1/2"	7/8"	0.04	Tyvek	1,500	0000000	00000
30	Up to 18% of desiccant weight	2 1/4"	7/8"	0.11	Tyvek	1,000	0000000	00000
235	Up to 18% of desiccant weight	3 1/8"	7/8"	0.21	Tyvek	500	0000000	00000
715	Up to 18% of desiccant weight	2 7/8"	2 1/8"	0.58	Tyvek	550	0000000	000000
1,425	Up to 18% of desiccant weight	4 1/2"	3"	1.16	Tyvek	300	0000000	000000
2,850	Up to 18% of desiccant weight	4 1/2"	5"	2.33	Tyvek	150	0000000	00000
5,700	Up to 18% of desiccant weight	6 1/4"	5"	4.66	Tyvek	100	0000000	000000
11,425	Up to 18% of desiccant weight	8 1/4"	4 1/2"	9.31	Tyvek	50	0000000	00000
22,850	Up to 18% of desiccant weight	11"	4 1/2"	18.62	Tyvek	25	0000000	00000
Anhydrous Calcium Sulfate
1,300	Up to 6% of desiccant weight	1"	2 1/4"	0.11	Paper	750	0000000	00000
2,600	Up to 6% of desiccant weight	1"	2 1/4"	0.21	Paper	750	0000000	00000
12,275	Up to 6% of desiccant weight	4"	3 3/4"	1	Paper	200	0000000	00000
24,525	Up to 6% of desiccant weight	4 3/4"	3 3/4"	2	Paper	400	0000000	000000
49,075	Up to 6% of desiccant weight	6 1/4"	3 3/4"	4	Paper	200	0000000	000000
98,150	Up to 6% of desiccant weight	6 1/4"	5 3/4"	8	Paper	100	0000000	000000

Indicating Desiccant Bags

Know when it's time to change these desiccants—they turn from blue to pink after absorbing 8% of their weight. Use to remove moisture from sealed containers during shipping and storage.

These desiccants are best when relative humidity is at least 40%. The area covered is calculated at 77° F and 40% relative humidity.

The bags have a monitoring window to check for desiccant color change.

						Small Pack			Large Pack
For Area, cu. in.	Removal Capacity	Lg.	Wd.	Wt., oz.	Bag Material	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.
Silica Gel
6	Up to 30% of desiccant weight	1 3/8"	7/8"	0.04	Tyvek	10	0000000	00000	1,000	0000000	0000000
18	Up to 30% of desiccant weight	1 3/4"	1"	0.11	Tyvek	10	0000000	0000	400	0000000	00000
36	Up to 30% of desiccant weight	2 5/8"	1"	0.21	Tyvek	10	0000000	0000	300	0000000	00000
85	Up to 30% of desiccant weight	3 1/8"	1 1/2"	0.5	Tyvek	10	0000000	00000	115	0000000	00000

Low-Humidity Desiccant Bags

Use when relative humidity is below 40% or temperatures exceed 77° F. These desiccants remove moisture from sealed containers during shipping and storage.

The area covered is calculated at 77° F and 40% relative humidity.

						Small Pack			Large Pack
For Area, cu. in.	Removal Capacity	Lg.	Wd.	Wt., oz.	Bag Material	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.
Aluminosilicate
156	Up to 20% of desiccant weight	1 3/4"	1"	0.11	Tyvek	10	0000000	00000	400	0000000	000000
356	Up to 20% of desiccant weight	2 1/8"	1 1/2"	0.25	Tyvek	10	0000000	00000	200	0000000	00000
1,425	Up to 20% of desiccant weight	3 1/2"	5"	1	Tyvek	5	0000000	00000	300	0000000	000000
2,850	Up to 20% of desiccant weight	5"	5"	2	Tyvek	5	0000000	00000	150	0000000	000000
5,700	Up to 20% of desiccant weight	7"	5"	4	Tyvek	2	0000000	00000	100	0000000	000000

High-Humidity Desiccant Bags

Bag

Bag With Hanging Strap and Locking Carabiner

When relative humidity is at least 90%, use these desiccants. They are often used to protect cargo sent in large containers from moisture.

The area covered is calculated at 77° F and 90% relative humidity.

Thirty-two 10 1/4" long desiccant bags are recommended for a 20-ft. shipping container.

22" long desiccant bags are best for large sea containers, rail cars, and river barges. They have a hanging strap and a locking carabiner, so you can secure them off the floor to save valuable floor space. Three bags are recommended for a 20-ft. shipping container.

Small Pack
For Area, cu. in.	Removal Capacity	Lg.	Wd.	Wt., oz.	Bag Material	Features	Pkg. Qty.		Pkg.
Starch/Calcium Chloride
69,120	Up to 280% of desiccant weight	10 1/4"	5 3/4"	4.4	Tyvek	__	4	000000	000000
69,120	Up to 150% of desiccant weight	22"	18"	52.9	Tyvek	Hanging Strap, Locking Carabiner	6	000000	000000
Large Pack
Starch/Calcium Chloride
69,120	Up to 280% of desiccant weight	10 1/4"	5 3/4"	4.4	Tyvek	__	32	000000	00000

Adhesive-Back High-Humidity Desiccant Bags

When relative humidity is at least 90%, use these desiccants. They are often used to protect cargo sent in large containers. 32 bags are recommended for a 20-ft. shipping container.

The area covered is calculated at 77° F and 90% relative humidity.

Bags come in strips of six bags that you can cut apart.

						Small Pack			Large Pack
For Area, cu. in.	Removal Capacity	Lg.	Wd.	Wt., oz.	Bag Material	Pkg. Qty.		Pkg.	Pkg. Qty.		Pkg.
Calcium Chloride and Starch
69,120	Up to 280% of desiccant weight	10 1/4"	5 3/4"	4.4	Tyvek	6	000000	000000	36	000000	0000000

Humidity-Indicating Plugs

Plug

40% Spot-Style Indicator

20%, 30%, 40% Pie-Style Indicator

20%, 30%, 40%, 50% Pie-Style Indicator

30%, 40%, 50%. 60% Pie-Style Indicator

20%, 30%, 40%, 50% Spot-Style Indicator

Monitor humidity in sealed containers without opening them, protecting the inside from contamination. These plugs are often used on plastic bags, storage containers, and electrical housings. Consisting of a mounting nut and two gaskets for a tight seal, these plugs install through a hole in a flexible barrier. Remove one gasket and reverse the nut to install plugs in a rigid container. Watch the indicator disc through the nut’s viewing window—it will change color as humidity rises and falls. Made of anodized aluminum, these plugs resist corrosion and are lightweight. They meet military and SAE standards for humidity indicators.

For technical drawings and 3-D models, click on a part number.

					Thread
Humidity Points	Accuracy	Height	Width	For Hole Diameter	Type	Size	Pipe Size	Indicator Use	Specifications Met		Each
Anodized Aluminum
Pie-Style Indicator
20%, 30%, 40%	±5%	5/8"	1 3/8"	1.05"	NPSM	__	3/4	Reversible	MIL-I-8835; SAE AS26860 Type 2	0000000	000000
20%, 30%, 40%, 50%	±5%	5/8"	1 3/8"	1.05"	NPSM	__	3/4	Reversible	MIL-I-8835; SAE AS26860 Type 2	0000000	00000
30%, 40%, 50%, 60%	±5%	5/8"	1 3/8"	1.05"	NPSM	__	3/4	Reversible	MIL-I-8835; SAE AS26860 Type 2	0000000	00000
Spot-Style Indicator
20%, 30%, 40%, 50%	±5%	5/8"	1 3/8"	1.05"	NPSM	__	3/4	Reversible	MIL-I-8835; SAE AS26860 Type 2	0000000	00000
20%, 30%, 40%, 50%	±5%	5/8"	1 7/8"	1.45"	UNEF	1 7/16"-18	__	Reversible	MIL-I-8835; SAE AS26860 Type 2	0000000	00000
40%	±5%	5/8"	1 3/8"	1.05"	NPSM	__	3/4	Reversible	MIL-I-8835; SAE AS26860 Type 2	0000000	00000

Humidity-Indicating Cards

Check humidity levels of moisture-sensitive inventory and equipment at a glance. To detect moisture exposure when packaging, shipping, and storing electronics and chemicals, these cards have dots that change color as humidity levels change. Store electronics in a moisture barrier bag with one of these cards and a desiccant bag (bags not included). To revert these cards to their original color, place them in a dry container for 24 hours or bake at 180° F for 3 hours. Cards will not revert to their original color once they reach 60% or greater humidity. They meet industry guidelines for packaging moisture-sensitive devices.

Cobalt-free cards have a lower impact on the environment than cards that are not cobalt-free.

Humidity Points	Accuracy	Container Type	Ht.	Wd.	Features	Specifications Met	Pkg. Qty.		Pkg.
5%, 10%, 15%	±5%	Can	3"	2"	__	MIL-I-8835	125	0000000	000000
5%, 10%, 15%	±5%	Can	3"	2"	Cobalt-Free	MIL-I-8835	125	0000000	00000
5%, 10%, 60%	±5%	Can	3"	2"	__	MIL-I-8835	125	0000000	00000
5%, 10%, 60%	±5%	Can	3"	2"	Cobalt-Free	MIL-I-8835	125	0000000	00000
10%, 20%, 30%, 40%	±5%	Can	2"	3"	__	MIL-I-8835	100	0000000	00000
10%, 20%, 30%, 40%, 50%, 60%	±5%	Can	4 3/4"	1 9/16"	__	MIL-I-8835	200	0000000	00000
10%, 20%, 30%, 40%, 50%, 60%	±5%	Can	4 3/4"	1 9/16"	Cobalt-Free	MIL-I-8835	200	0000000	00000
30%, 40%, 50%	±5%	Can	3"	2"	__	MIL-I-8835	125	0000000	00000
30%, 40%, 50%	±5%	Can	3"	2"	Cobalt-Free	MIL-I-8835	125	0000000	00000

Through-Wall Humidity and Temperature Meters

Monitor relative humidity, temperature, and dew point inside sealed containers. These meters are rated IP67, so they won't expose contents to dust and water. The housing is aluminum, which is lightweight and resists corrosion.

For technical drawings and 3-D models, click on a part number.

Relative Humidity		Temperature		Dew Point
Range	Accuracy	Indoor Range	Accuracy	Range	Accuracy	Dp.	Dia.	For Hole Dia.	For Max. Wall Thick.	Batteries Included	Fasteners Included	Environmental Rating		Each
5 to 80%	±3%	-4° to 140° F/-20° to 60° C	±1° F/±0.5° C	-22° to 68° F/-30° to 20° C	±3.6° F/±2° C	1 1/4"	2 1/2"	1 27/64"	11/32"	Yes	Yes	IP67	0000000	0000000