Desiccant Absorbents | McMaster-Carr

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96 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	000000
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	000000
22,850	Up to 18% of desiccant weight	11"	4 1/2"	18.62	Tyvek	25	0000000	000000
Anhydrous Calcium Sulfate
1,300	Up to 6% of desiccant weight	1"	2 1/4"	0.11	Paper	750	0000000	000000
2,600	Up to 6% of desiccant weight	1"	2 1/4"	0.21	Paper	750	0000000	000000
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
For Area, cu. in.	Removal Capacity	Lg.	Wd.	Wt., oz.	Bag Material	Pkg. Qty.		Pkg.
Silica Gel
6	Up to 30% of desiccant weight	1 3/8"	7/8"	0.04	Tyvek	10	0000000	00000
18	Up to 30% of desiccant weight	1 3/4"	1"	0.11	Tyvek	10	0000000	0000
36	Up to 30% of desiccant weight	2 5/8"	1"	0.21	Tyvek	10	0000000	00000
85	Up to 30% of desiccant weight	3 1/8"	1 1/2"	0.5	Tyvek	10	0000000	00000
Large Pack
Silica Gel
6	Up to 30% of desiccant weight	1 3/8"	7/8"	0.04	Tyvek	1,000	0000000	000000
18	Up to 30% of desiccant weight	1 3/4"	1"	0.11	Tyvek	400	0000000	00000
36	Up to 30% of desiccant weight	2 5/8"	1"	0.21	Tyvek	300	0000000	00000
85	Up to 30% of desiccant weight	3 1/8"	1 1/2"	0.5	Tyvek	115	0000000	00000

Food Industry Desiccant Bags

FDA compliant for direct contact with food, these Tyvek bags absorb vapors, odors, and gases to keep products fresh.

Silica Gel
Wt., oz.	For Area, cu. in.	Removal Capacity	Lg.	Wd.	Bag Material	Specifications Met	Pkg. Qty.		Pkg.
0.03	6	Up to 38% of desiccant weight	1 1/2"	7/8"	Tyvek	FDA Compliant 21 CFR 172.230, FDA Compliant 21 CFR 172.480, FDA Compliant 21 CFR 175.390, FDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.2010, FDA Compliant 21 CFR 182.90	1,000	0000000	000000
0.17	45	Up to 38% of desiccant weight	2 7/8"	1"	Tyvek	FDA Compliant 21 CFR 172.230, FDA Compliant 21 CFR 172.480, FDA Compliant 21 CFR 175.390, FDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.2010, FDA Compliant 21 CFR 182.90	300	0000000	00000
0.35	__	Up to 38% of desiccant weight	3 1/2"	1 3/8"	Tyvek	FDA Compliant 21 CFR 172.230, FDA Compliant 21 CFR 172.480, FDA Compliant 21 CFR 175.390, FDA Compliant 21 CFR 177.1520, FDA Compliant 21 CFR 178.2010, FDA Compliant 21 CFR 182.90	150	0000000	00000

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	__	64	000000	000000

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

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

Indicating Bulk Desiccants

Bag

Pail

Know when it's time to reactivate these desiccants—they turn from blue to pink after absorbing 6% of their weight.

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

				Reactivation
For Area, cu. in.	Removal Capacity	Wt., lbs.	Container Type	Method	Temperature, °F	Time, hrs.		Each
Silica Gel
23,025	Up to 23% of desiccant weight	1	Bag	Oven	255°	12	0000000	000000
115,175	Up to 23% of desiccant weight	5	Pail	Oven	255°	12	0000000	00000
230,350	Up to 23% of desiccant weight	10	Pail	Oven	255°	12	0000000	000000
691,025	Up to 33% of desiccant weight	30	Pail	Oven	255°	12	00000000	000000
1,266,875	Up to 33% of desiccant weight	55	Bag	Oven	255°	12	00000000	000000

Bulk Desiccants

Pail

Bag

Reactivate these desiccants after use by heating them.

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

				Reactivation
For Area, cu. in.	Removal Capacity	Wt., lbs.	Container Type	Method	Temperature, °F	Time, hrs.		Each
Silica Gel
23,025	Up to 23% of desiccant weight	1	Pail	Oven	255°	12	0000000	000000
115,175	Up to 23% of desiccant weight	5	Pail	Oven	255°	12	0000000	00000
230,350	Up to 23% of desiccant weight	10	Pail	Oven	255°	12	0000000	000000
691,025	Up to 33% of desiccant weight	30	Pail	Oven	255°	12	00000000	000000
1,266,880	Up to 33% of desiccant weight	55	Bag	Oven	255°	12	00000000	000000

Indicating Desiccant Canisters

Know when it's time to reactivate these desiccants—they turn from blue to pink when they reach maximum moisture absorption. They are stored in a durable canister.

Aluminum canister has a monitoring window to check for desiccant color change.

Plastic canister is clear so you can see when the desiccant color changes. Desiccant can also be reactivated in a microwave oven. Microwave it for small increments of time and watch for the desiccant color to change.

						Reactivation
For Area, cu. in.	Removal Capacity	Lg.	Wd.	Dp.	Wt., oz.	Method	Temperature, °F	Time, hrs.		Each
Silica Gel
Aluminum Canister
5,175	Up to 18% of desiccant weight	4 1/8"	2 1/4"	5/8"	1.4	Oven	300°	3	0000000	000000
Plastic Canister
5,175	Up to 18% of desiccant weight	4 1/4"	2 5/8"	3/4"	1.4	Oven	300°	3	0000000	00000

Desiccant Canisters

Stored in a durable canister, these desiccants can be reactivated after use.

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

					Reactivation
For Area, cu. in.	Removal Capacity	Lg.	Wt.	OD	Method	Temperature, °F	Time, hrs.	Canister Material		Each
Anhydrous Calcium Sulfate
10,375	Up to 6% of desiccant weight	6"	5.3 oz.	1 1/2"	Oven	425°	1	Aluminum	0000000	000000
345,600	Up to 6% of desiccant weight	16"	10 lbs.	4 1/2"	Oven	450°	3	Aluminum	0000000	000000

Rechargeable Small-Space Dehumidifiers

Place these dehumidifiers in small spaces to protect moisture-sensitive materials such as photo lenses or 3D printing filaments. They absorb moisture with a silica gel that changes color, letting you know when they’re saturated. While they don’t need a battery or power cord during use, you do plug them in to dry them out—unlike other desiccants, they don’t require an oven.

						Reactivation
For Area, cu. ft.	Removal Capacity	Lg.	Wd.	Dp.	Wt., oz.	Method	Time, hrs.	Housing Material	Plug Type		Each
Silica Gel
333	Up to 25% of desiccant weight	6 1/4"	4 3/4"	1 1/4"	24	Plug In	12	Plastic	Two Prong	000000	000000
500	Up to 22% of desiccant weight	8"	5 1/2"	2 1/2"	35	Plug In	15	Plastic	Two Prong	000000	00000

Desiccators

Protect material from moisture by storing them in these desiccators. Create a vacuum using the tube connection.

You need both the desiccator and the cartridge, each sold separately. The cartridge has indicating desiccant that turns from blue to pink when maximum absorption is reached.

Desiccators

			Vacuum				Canister
OD	ID	Ht.	Rating, in. of Hg	Duration, hrs.	For Tube ID	Tube Connection Type	Material	Clarity		Each
6 3/4"	5 7/8"	8 1/8"	29	24	1/4"	Barbed	Plastic	Clear	000000	000000
9 1/16"	7 3/4"	10 1/4"	29	24	1/4"	Barbed	Plastic	Clear	000000	000000
10 3/4"	9 7/16"	12 1/8"	29	24	1/4"	Barbed	Plastic	Clear	000000	000000

Cartridges

				Reactivation
For Desiccator OD	For Area, cu. in.	Removal Capacity	Wt., lbs.	Method	Temperature, °F	Time, min.	Absorption Indicator		Each
Silica Gel
6 3/4"	8,625	Up to 20% of desiccant weight	3/4	Microwave	300°	6	Yes	00000000	000000
9 1/16"	32,825	Up to 20% of desiccant weight	1	Microwave	300°	6	Yes	00000000	00000
10 3/4"	57,000	Up to 20% of desiccant weight	2 1/4	Microwave	300°	6	Yes	00000000	000000