Moisture Absorbents | McMaster-Carr

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Desiccant Material

Anhydrous Calcium Sulfate

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Desiccant Type

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Weight

Width

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Anhydrous Calcium Sulfate

Starch/Calcium Chloride

Steel

Absorption Capacity Relative to Desiccant Weight

Absorption Indicator

Reusable

Environment

Bag Material

RoHS

REACH

Reactivation Method

Export Control Classification Number (ECCN)

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

DFARS Specialty Metals

Exempt

Canister Material

Aluminum

Plastic

Reactivation Temperature

Reactivation Time

Color

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Mobility

101 Products

Desiccants

Remove moisture from sealed containers during shipping and storage. The area covered is calculated at 77° F and 40% relative humidity.

Bags

	For Area, cu. in.	Absorption Cap. Relative to Desiccant Wt.	Lg.	Wd.	Wt., oz.	Bag Material	Pkg. Qty.		Pkg.
Anhydrous Calcium Sulfate Desiccants



		1,300	6%	1"	2 1/4"	0.11	Paper	25	2140K31	000000


		1,300	6%	1"	2 1/4"	0.11	Paper	750	2140K51	000000
		2,600	6%	1"	2 1/4"	0.21	Paper	750	2140K52	000000
		2,600	6%	1"	2 3/4"	0.21	Paper	25	2140K32	00000
		12,275	6%	4"	3 3/4"	1	Paper	25	2140K43	00000
		12,275	6%	4"	3 3/4"	1	Paper	200	2140K53	00000
		24,525	6%	4 3/4"	3 3/4"	2	Paper	20	2140K44	00000
		24,525	6%	4 3/4"	3 3/4"	2	Paper	400	2140K54	000000
		49,075	6%	6 1/4"	3 3/4"	4	Paper	10	2140K45	00000
		49,075	6%	6 1/4"	3 3/4"	4	Paper	200	2140K55	000000
		98,150	6%	6 1/4"	5 3/4"	8	Paper	5	2140K46	00000


		98,150	6%	6 1/4"	5 3/4"	8	Paper	100	2140K56	000000


		Clay Desiccants



				2	18%	1"	5/8"	0.01	Tyvek	400	2139K71	00000


				2	18%	1"	5/8"	0.01	Tyvek	2,500	2139K83	000000
				9	18%	1 1/2"	7/8"	0.04	Tyvek	250	2139K74	00000
				9	18%	1 1/2"	7/8"	0.04	Tyvek	1,500	2139K86	00000
				30	18%	2 1/4"	7/8"	0.11	Tyvek	125	2139K75	00000
				30	18%	2 1/4"	7/8"	0.11	Tyvek	1,000	2139K87	000000
				235	18%	3 1/8"	7/8"	0.21	Tyvek	50	2139K76	00000
				235	18%	3 1/8"	7/8"	0.21	Tyvek	500	2139K88	00000
				715	18%	2 7/8"	2 1/8"	0.58	Tyvek	75	2139K77	00000
				715	18%	2 7/8"	2 1/8"	0.58	Tyvek	550	2139K89	000000
				1,425	18%	4 1/2"	3"	1.16	Tyvek	50	2139K78	00000


				1,425	18%	4 1/2"	3"	1.16	Tyvek	300	2139K91	000000
				2,850	18%	4 1/2"	5"	2.33	Tyvek	25	2139K79	00000
				2,850	18%	4 1/2"	5"	2.33	Tyvek	150	2139K92	000000
				5,700	18%	6 1/4"	5"	4.66	Tyvek	100	2139K93	000000
				5,700	18%	7"	6"	4	Polyester Plastic	12	2139K23	00000
				11,425	18%	8 1/4"	4 1/2"	9.31	Tyvek	7	2139K82	00000
				11,425	18%	8 1/4"	4 1/2"	9.31	Tyvek	50	2139K94	000000
				22,850	18%	11"	4 1/2"	18.62	Tyvek	3	2139K96	00000
				22,850	18%	11"	4 1/2"	18.62	Tyvek	25	2139K95	000000


				Silica Gel Desiccants



						6	32%	1 3/8"	3/4"	0.04	Tyvek	10	2189K14	0000


						6	32%	1 3/8"	3/4"	0.04	Tyvek	1,000	2189K34	00000
						24	32%	1 3/4"	1"	0.11	Tyvek	10	2189K15	0000
						24	32%	1 3/4"	1"	0.11	Tyvek	400	2189K35	00000
						235	32%	2 3/4"	1"	0.21	Tyvek	10	2189K16	0000
						235	32%	2 3/4"	1"	0.21	Tyvek	250	2189K46	00000
						1,425	32%	6"	1 1/2"	1	Tyvek	5	2189K17	0000
1,425						32%	6"	1 1/2"	1	Tyvek	300	2189K37	000000
2,850	32%					6"	5"	2	Tyvek	5	2189K18	00000
2,850	32%					6"	5"	2	Tyvek	150	2189K38	000000
5,700	32%					7 1/8"	5"	4	Tyvek	2	2189K19	00000


5,700	32%					7 1/8"	5"	4	Tyvek	100	2189K39	000000
11,425	32%					8 1/2"	5"	8	Tyvek	2	2189K21	00000
11,425	32%					8 1/2"	5"	8	Tyvek	50	2189K41	000000
22,850	32%					9 1/4"	7 1/2"	16	Tyvek	1	2189K47	00000
22,850	32%					9 1/4"	7 1/2"	16	Tyvek	30	2189K48	000000

Bulk


Bag	Pail

Reactivate these desiccants after use by heating them.

					Reactivation
	For Area, cu. in.	Absorption Cap. Relative to Desiccant Wt.	Wt., lb.	Container Type	Method	Temp., ° F	Time, hr.		Each
Silica Gel Desiccants



		23,025	23%	1	Bag	Oven	255	12	2181K91	000000


		115,175	23%	5	Pail	Oven	255	12	2181K92	00000
		230,350	23%	10	Pail	Oven	255	12	2181K98	000000
		691,025	33%	30	Pail	Oven	255	12	2181K101	000000
		1,266,880	33%	55	Bag	Oven	255	12	2181K102	000000

Canisters

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

						Reactivation
	For Area, cu. in.	Absorption Cap. Relative to Desiccant Wt.	Lg.	OD	Wt.	Method	Temp., ° F	Time, hr.		Each
Anhydrous Calcium Sulfate Desiccants







				Aluminum Canister

				10,375	6%	6"	1 1/2"	5.3 oz.	Oven	425	1	2202K67	000000


				345,600	6%	16"	4 1/2"	10 lb.	Oven	450	3	2202K66	000000

Absorption-Indicating Desiccants

Know when it's time to reactivate these desiccants. Use to remove moisture from sealed containers during shipping and storage.

Bags

Bags turn from blue to pink after absorbing 8% of their weight.

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

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

	Absorption Cap. Relative to Desiccant Wt.	Lg.	Wd.	Wt., oz.	Bag Material	Features	Pkg. Qty.		Pkg.
Silica Gel Desiccants



	6	30%	1 3/8"	7/8"	0.04	Tyvek	Monitoring Window	10	3492T11	00000


	6	30%	1 3/8"	7/8"	0.04	Tyvek	Monitoring Window	1,000	3492T33	000000
	18	30%	1 3/4"	1"	0.11	Tyvek	Monitoring Window	10	3492T12	0000
	18	30%	1 3/4"	1"	0.11	Tyvek	Monitoring Window	400	3492T34	00000
	36	30%	2 5/8"	1"	0.21	Tyvek	Monitoring Window	10	3492T13	0000
	36	30%	2 5/8"	1"	0.21	Tyvek	Monitoring Window	300	3492T35	00000
	85	30%	3 1/8"	1 1/2"	0.5	Tyvek	Monitoring Window	10	3492T15	00000
	85	30%	3 1/8"	1 1/2"	0.5	Tyvek	Monitoring Window	115	3492T37	00000

Bulk


Bag	Pail

These desiccants 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.	Absorption Cap. Relative to Desiccant Wt.	Wt., lb.	Container Type	Method	Temp., ° F	Time, hr.		Each
Silica Gel Desiccants



		23,025	23%	1	Bag	Oven	255	12	2181K93	000000


		115,175	23%	5	Pail	Oven	255	12	2181K94	00000
		230,350	23%	10	Pail	Oven	255	12	2181K97	000000
		691,025	33%	30	Pail	Oven	255	12	2181K103	000000
		1,266,875	33%	55	Bag	Oven	255	12	2181K104	000000

Canisters

Stored in a durable canister, these desiccants turn from blue to pink when they reach maximum moisture absorption.

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

Plastic Canister—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.	Absorption Cap. Relative to Desiccant Wt.	Lg.	Wd.	Wt., oz.	Method	Temp., ° F	Time, hr.	Features		Each
Silica Gel Desiccants







				Aluminum Canister

				5,175	18%	4 1/8"	2 1/4"	1.4	Oven	300	3	Monitoring Window	2219K91	000000




						Plastic Canister

						5,175	18%	4 1/4"	2 5/8"	1.4	Oven	300	3	—	2219K92	00000

High-Humidity Desiccants

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.

Bags


Bag	Bag With Hanging Strap and Locking Carabiner

10 1/4" Long—Thirty-two 10 _1/4" long desiccant bags are recommended for a 20-ft. shipping container.

22" Long—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.

	Absorption Cap. Relative to Desiccant Wt.	Lg.	Wd.	Wt., oz.	Bag Material	Features	Pkg. Qty.		Pkg.
Starch/Calcium Chloride Desiccants



	69,120	280%	10 1/4"	5 3/4"	4.4	Tyvek	—	4	2228K6	000000


	69,120	280%	10 1/4"	5 3/4"	4.4	Tyvek	—	64	2228K8	000000
	69,120	150%	22"	18"	52.9	Tyvek	Hanging Strap, Locking Carabiner	6	2228K1	000000

Adhesive-Back Bags

Bags come in strips of six bags that you can cut apart. 32 bags are recommended for a 20-ft. shipping container.

	Absorption Cap. Relative to Desiccant Wt.	Lg.	Wd.	Wt., oz.	Bag Material	Pkg. Qty.		Pkg.
Calcium Chloride, Starch Desiccants



	69,120	280%	10 1/4"	5 3/4"	4.4	Tyvek	6	2228K7	000000


	69,120	280%	10 1/4"	5 3/4"	4.4	Tyvek	36	2228K9	000000

Desiccants for Food and Beverage

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

Bags

	Absorption Cap. Relative to Desiccant Wt.	Lg.	Wd.	Wt., oz.	Bag Material	Food Industry Std.	Pkg. Qty.		Pkg.
Silica Gel Desiccants



	6	38%	1 1/2"	7/8"	0.03	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	5321N11	000000


	45	38%	2 7/8"	1"	0.17	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	5321N12	00000
	—	38%	3 1/2"	1 3/8"	0.35	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	5321N13	00000

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			Electrical
	For Area, cu. ft.	Absorption Cap. Relative to Desiccant Wt.	Lg.	Wd.	Dp.	Wt., oz.	Method	Time, hr.	Housing Material	Connection	No. of Blades		Each
Silica Gel Desiccant



		333	25%	6 1/4"	4 3/4"	1 1/4"	24	Plug In	12	Plastic	Straight Blade	2	3410N2	000000


		500	22%	8"	5 1/2"	2 1/2"	35	Plug In	15	Plastic	Straight Blade	2	3410N3	00000

Low-Humidity Desiccants

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.

Bags

	Absorption Cap. Relative to Desiccant Wt.	Lg.	Wd.	Wt., oz.	Bag Material	Pkg. Qty.		Pkg.
Aluminosilicate Desiccants



	156	20%	1 3/4"	1"	0.11	Tyvek	10	1523T61	00000


	156	20%	1 3/4"	1"	0.11	Tyvek	400	1523T75	000000
	356	20%	2 1/8"	1 1/2"	0.25	Tyvek	10	1523T62	0000
	356	20%	2 1/8"	1 1/2"	0.25	Tyvek	200	1523T76	00000
	1,425	20%	3 1/2"	5"	1	Tyvek	5	1523T63	00000
	1,425	20%	3 1/2"	5"	1	Tyvek	300	1523T77	000000
	2,850	20%	5"	5"	2	Tyvek	5	1523T64	00000
	2,850	20%	5"	5"	2	Tyvek	150	1523T78	000000
	5,700	20%	7"	5"	4	Tyvek	2	1523T65	00000
	5,700	20%	7"	5"	4	Tyvek	100	1523T79	000000

Desiccants for Compressed Air Dryers

Restore moisture-trapping power to your compressed air dryer by replacing spent desiccant beads. You can reuse these beads by heating them in an oven at their reactivation temperature. If they return to blue, they’re still usable. Once they stay pink, it’s time to replace them.

Bulk

Image of Product. Front orientation. Desiccants. Desiccants for Compressed Air Dryers.

	Desiccant Color				Reactivation			1 qt. Container		1 gal. Container
	Saturated	Dry	Absorption Cap. Relative to Desiccant Wt.	Type	Method	Temp., ° F	Time, hr.		Each		Each
Silica Gel Desiccants



		Pink	Blue	30%	Jar	Oven	275	12	4370K3	000000	4370K4	000000

Dehumidifying Cabinets

Store and protect 3D printer filaments, optical equipment, and other sensitive material in a humidity-controlled environment. Also known as dry boxes and desiccator cabinets, these cabinets prevent moisture-sensitive 3D printer filaments, such as nylon, ABS, and polycarbonate, from becoming brittle, discolored, or broken. They also keep sensitive electrical and optical equipment, such as microscopes and lenses, free from mold and fungus. Their moisture-absorbing desiccants recharge automatically, so you don't have to remember to charge them yourself or worry about the humidity rising unintentionally.

Standard

Standard cabinets are sized to store small equipment, such as flasks and lenses, as well as small filament spools. The desiccants recharge every 20 minutes to keep relative humidity below 30%. Although you cannot set the humidity to a specific level, a humidity meter on the door lets you check the reading.

	Overall				Shelf							Electrical
	Ht.	Wd.	Dp.	Wt. Cap., lb.	Movement (No. of)	Wt. Cap., lb.	Ctr.-to-Ctr. Adjustments	Max. RH	Desiccant Material	Material	Window Material	Connection	No. of Blades	Cord Lg., ft.		Each
Assembled



		12 1/2"	13 1/2"	16 1/2"	80	Adjustable (2)	40	4"	30%	Silica Gel	Plastic	Plastic	Straight Blade	2	8	3457N11	0000000


		20 1/2"	13 1/2"	16 1/2"	120	Adjustable (3)	40	4"	30%	Silica Gel	Plastic	Plastic	Straight Blade	2	8	3457N12	00000000

With Filament Feed Ports


Filament Feed Ports	Filament Feed Ports

Designed with 3D printing in mind, cabinets with filament feed ports are large enough to hold up to four 12"-dia. filament spools. They also have four filament feed ports, so you can keep filament dry while still feeding a printer, ensuring the filament doesn't go bad in the middle of a longer job. These cabinets can lower relative humidity to less than 20%; set and monitor the level using the analog display.

	Overall			Shelf								Electrical
	Ht.	Wd.	Dp.	Movement (No. of)	Wt. Cap.	Ctr.-to-Ctr. Adjustments	Max. RH	Desiccant Material	For Filament Dia., mm	Material	Window Material	Connection	No. of Blades	Cord Lg., ft.	Features		Each
Assembled



		21 7/8"	15 3/4"	16"	Adjustable (1)	Not Rated	1"	20%	Aluminosilicate	1.75 to 4.76	Painted Steel	Glass	Straight Blade	2	6	Analog Humidity Control and Display	3457N14	0000000

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 desiccant, each sold separately.

Desiccants—The desiccant has an indicator that turns from blue to pink when maximum absorption is reached.

Desiccators											Desiccants
			Vacuum				Canister								Reactivation
OD	ID	Ht.	Rating, in. Hg	Duration, hr.	For Tube ID	Fitting Connection	Material	Clarity		Each	Desiccant Material	For Area, cu. in.	Absorption Cap. Relative to Desiccant Wt.	Wt., lb.	Method	Temperature, ° F	Time, min.	Absorption Indicator		Each



	6 3/4"	5 7/8"	8 1/8"	29	24	1/4"	Barbed	Plastic	Clear	2204K5	000000	Silica Gel	8,625	20%	0.75	Microwave Oven	300	6	Yes	2204K511	000000


	9 1/16"	7 3/4"	10 1/4"	29	24	1/4"	Barbed	Plastic	Clear	2204K6	000000	Silica Gel	32,825	20%	1	Microwave Oven	300	6	Yes	2204K611	00000
	10 3/4"	9 7/16"	12 1/8"	29	24	1/4"	Barbed	Plastic	Clear	2204K7	000000	Silica Gel	57,000	20%	2.25	Microwave Oven	300	6	Yes	2204K711	000000