McMaster-Carr logo
    Filter by
    System of Measurement
    For Removing
    Bag Material
    Absorption Capacity Relative to Desiccant Weight
    Absorption Indicator
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    Industrial Info Compare
    DFARS Specialty Metals
    Mounting Location
    Maximum Temperature
    Hole Diameter
    Minimum Temperature
    Indicator Type
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    Help me decide (beta)
    91 Products

    Desiccants

    Remove moisture from sealed containers during shipping and storage. The area covered is calculated at 77° F and 40% relative humidity.
    Bags
    Image of Product. Front orientation. Desiccants. Bags.
    Small Pack
    Large Pack
    For Area,
    cu. in.
    Absorption Cap. Relative
    to Desiccant Wt.
    Lg.
    Wd.
    Wt.,
    oz.
    Bag Material
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    Anhydrous Calcium Sulfate Desiccants
    1,3006%1"2 1/4"0.11Paper252140K310000007502140K510000000
    2,6006%1"2 1/4"0.21Paper————07502140K52000000
    2,6006%1"2 3/4"0.21Paper252140K3200000————0
    12,2756%4"3 3/4"1Paper252140K43000002002140K5300000
    24,5256%4 3/4"3 3/4"2Paper202140K44000004002140K54000000
    49,0756%6 1/4"3 3/4"4Paper102140K45000002002140K55000000
    98,1506%6 1/4"5 3/4"8Paper52140K46000001002140K56000000
     
    Clay Desiccants
    218%1"5/8"0.01Tyvek4002139K71000002,5002139K83000000
    918%1 1/2"7/8"0.04Tyvek2502139K74000001,5002139K8600000
    3018%2 1/4"7/8"0.11Tyvek1252139K75000001,0002139K87000000
    23518%3 1/8"7/8"0.21Tyvek502139K76000005002139K8800000
    71518%2 7/8"2 1/8"0.58Tyvek752139K77000005502139K89000000
    1,42518%4 1/2"3"1.16Tyvek502139K78000003002139K91000000
    2,85018%4 1/2"5"2.33Tyvek252139K79000001502139K92000000
    5,70018%6 1/4"5"4.66Tyvek————01002139K93000000
    5,70018%7"6"4Polyester Plastic122139K2300000————0
    11,42518%8 1/4"4 1/2"9.31Tyvek72139K8200000502139K94000000
    22,85018%11"4 1/2"18.62Tyvek32139K9600000252139K95000000
     
    Silica Gel Desiccants
    632%1 3/8"3/4"0.04Tyvek102189K1400001,0002189K3400000
    2432%1 3/4"1"0.11Tyvek102189K1500004002189K3500000
    23532%2 3/4"1"0.21Tyvek102189K16000002502189K4600000
    1,42532%6"1 1/2"1Tyvek52189K1700003002189K37000000
    2,85032%6"5"2Tyvek52189K18000001502189K38000000
    5,70032%7 1/8"5"4Tyvek22189K19000001002189K39000000
    11,42532%8 1/2"5"8Tyvek22189K2100000502189K41000000
    22,85032%9 1/4"7 1/2"16Tyvek12189K4700000302189K48000000
     

    Corrosion-Inhibiting Packets

    Image of Product. Side1 orientation. Corrosion-Inhibiting Packets.
    Toss these packs into your shipping box to stop metals from corroding, oxidizing, tarnishing, and discoloring. These packs emit vapors that are absorbed by metal surfaces, creating a protective barrier. They're also known as volatile corrosion inhibitor (VCI) vapor packs.
    For Area,
    cu. ft.
    Wd.
    Lg.
    Bag
    Material
    Temp. Range,
    ° F
    Useful
    Life, mo.
    For Use With
    Pkg.
    Qty.
    Pkg.
    32"2 3/4"Tyvek20 to 9524Aluminum, Brass, Carbon Steel, Copper, Galvanized Steel, Silicon Steel, Silver, Solder, Stainless Steel55552N11000000

    Absorption-Indicating Desiccants

    Know when it's time to reactivate these desiccants. Use to remove moisture from sealed containers during shipping and storage.
    Bags
    Image of Product. Front orientation. Desiccants. Absorption-Indicating Desiccants, 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.
    Small Pack
    Large Pack
    For Area,
    cu. in.
    Absorption Cap. Relative
    to Desiccant Wt.
    Lg.
    Wd.
    Wt.,
    oz.
    Bag
    Material
    Features
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    Silica Gel Desiccants
    630%1 3/8"7/8"0.04TyvekMonitoring Window103492T11000001,0003492T330000000
    1830%1 3/4"1"0.11TyvekMonitoring Window103492T1200004003492T3400000
    3630%2 5/8"1"0.21TyvekMonitoring Window103492T13000003003492T3500000
    8530%3 1/8"1 1/2"0.5TyvekMonitoring Window103492T15000001153492T3700000
     

    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
    Image of Product. Front orientation. Desiccants. Low-Humidity Desiccants, Bags.
    Small Pack
    Large Pack
    For Area,
    cu. in.
    Absorption Cap. Relative
    to Desiccant Wt.
    Lg.
    Wd.
    Wt.,
    oz.
    Bag
    Material
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    Aluminosilicate Desiccants
    15620%1 3/4"1"0.11Tyvek101523T61000004001523T750000000
    35620%2 1/8"1 1/2"0.25Tyvek101523T6200002001523T7600000
    1,42520%3 1/2"5"1Tyvek51523T63000003001523T77000000
    2,85020%5"5"2Tyvek51523T64000001501523T78000000
    5,70020%7"5"4Tyvek21523T65000001001523T79000000
     

    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
    Image of Product. Bag. Front orientation. Desiccants. High-Humidity Desiccants, Bags, 4.4 oz..
    Image of Product. Bag With Hanging Strap and Locking Carabiner. Front orientation. Desiccants. High-Humidity Desiccants, Bags, 52.9 oz..

    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.
    Small Pack
    Large Pack
    For Area,
    cu. in.
    Absorption Cap. Relative
    to Desiccant Wt.
    Lg.
    Wd.
    Wt.,
    oz.
    Bag
    Material
    Features
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    Calcium Chloride/Starch Desiccants
    69,120280%10 1/4"5 3/4"4.4Tyvek—42228K6000000642228K80000000
    69,120150%22"18"52.9TyvekHanging Strap, Locking Carabiner62228K1000000————0
     
    Adhesive-Back Bags
    Image of Product. Front orientation. Desiccants. High-Humidity Desiccants, 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.
    Pkg. of 6
    Pkg. of 36
    For Area,
    cu. in.
    Absorption Cap. Relative
    to Desiccant Wt.
    Lg.
    Wd.
    Wt.,
    oz.
    Bag
    Material
    Pkg.
    Pkg.
    Calcium Chloride, Starch Desiccants
    69,120280%10 1/4"5 3/4"4.4Tyvek2228K70000002228K90000000
     

    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
    Image of Product. Front orientation. Desiccants. Desiccants for Food and Beverage , Bags.
    For Area,
    cu. in.
    Absorption Cap. Relative
    to Desiccant Wt.
    Lg.
    Wd.
    Wt.,
    oz.
    Bag
    Material
    Food Industry Std.
    Pkg.
    Qty.
    Pkg.
    Silica Gel Desiccants
    638%1 1/2"7/8"0.03TyvekFDA 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 182.901,0005321N11000000
    4538%2 7/8"1"0.17TyvekFDA 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 182.903005321N1200000
    —38%3 1/2"1 3/8"0.35TyvekFDA 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 182.901505321N1300000
     

    Through-Wall-Mount Temperature and Humidity Meters

    Image of Product. Front orientation. Temperature and Humidity Meters. Through-Wall-Mount Temperature and Humidity Meters.
    Image of Attribute. Side1 orientation. Contains Annotated. Through-Wall Mount.
    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.
    RH
    Temp.
    Dew Point
    Range
    Accuracy
    Indoor Range,
    ° C
    Accuracy
    Range,
    ° C
    Accuracy
    Dp.
    Dia.
    For Hole
    Dia.
    For Max.
    Wall Thk.
    Batteries
    Included
    Fasteners
    Included
    Enclosure
    Rating
    Each
    5% to 80%±3%-20 to 60±0.5° C-30 to 20±2° C1 1/4"2 1/2"1 27/64"11/32"YesYesIP67
    		6160N110000000

    Humidity-Indicating Plugs

    Image of Product. Front orientation. Humidity-Indicating Plugs.
    Image of Product. 40% Spot Indicator. Front orientation. Humidity-Indicating Plugs. Spot Indicator, 40% Humidity Points.

    40% Spot Indicator

    Image of Specification. 20%, 30%, 40% Pie Indicator. Front orientation. Pie Indicator. 40% Humidity Points, 20% Humidity Points, 30% Humidity Points.
    Image of Specification. 20%, 30%, 40%, 50% Pie Indicator. Front orientation. Pie Indicator. 20% Humidity Points, 40% Humidity Points, 50% Humidity Points, 30% Humidity Points.

    20%, 30%, 40% Pie

    Indicator

    20%, 30%, 40%, 50%

    Pie Indicator

    Image of Specification. 30%, 40%, 50%. 60% Pie Indicator. Front orientation. Pie Indicator. 50% Humidity Points, 40% Humidity Points, 60% Humidity Points, 30% Humidity Points.
    Image of Specification. 20%, 30%, 40%, 50% Spot Indicator. Front orientation. Spot Indicator. 20% Humidity Points, 40% Humidity Points, 50% Humidity Points, 30% Humidity Points.

    30%, 40%, 50%. 60%

    Pie Indicator

    20%, 30%, 40%, 50%

    Spot 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.
    Thread
    Humidity Points
    Accuracy
    Ht.
    Wd.
    For Hole
    Dia.
    Type
    Size
    Pipe
    Size
    Indicator
    Use
    Mil.
    Spec.
    Specs. Met
    Each
    Anodized Aluminum
     
    Pie Indicator
    20%, 30%, 40%, 50%±5%5/8"1 3/8"1.05"NPSM
    		—3/4
    		ReversibleMIL-I-8835SAE AS26860 Type 22229K13000000
    20%, 30%, 40%±5%5/8"1 3/8"1.05"NPSM
    		—3/4
    		ReversibleMIL-I-8835SAE AS26860 Type 22229K1400000
    30%, 40%, 50%, 60%±5%5/8"1 3/8"1.05"NPSM
    		—3/4
    		ReversibleMIL-I-8835SAE AS26860 Type 22229K1600000
     
    Spot Indicator
    20%, 30%, 40%, 50%±5%5/8"1 3/8"1.05"NPSM
    		—3/4
    		ReversibleMIL-I-8835SAE AS26860 Type 22229K1200000
    20%, 30%, 40%, 50%±5%5/8"1 7/8"1.45"UNEF
    		1 7/16"-18
    		—ReversibleMIL-I-8835SAE AS26860 Type 22229K1900000
    40%±5%5/8"1 3/8"1.05"NPSM
    		—3/4
    		ReversibleMIL-I-8835SAE AS26860 Type 22229K1100000
     

    Humidity-Indicating Cards

    Image of Product. Front orientation. 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 Humidity-Indicating Cards—Cobalt-free cards have a lower impact on the environment than cards that are not cobalt-free.
    Humidity-Indicating
    Cards
    Cobalt-Free
    Humidity-Indicating Cards
    Humidity Points
    Accuracy
    Container
    Type
    Ht.
    Wd.
    Mil.
    Spec.
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    5%, 10%, 15%±5%Can3"2"MIL-I-88351252175K140000001252175K19000000
    5%, 10%, 60%±5%Can3"2"MIL-I-88351252175K15000001252175K1800000
    10%, 20%, 30%, 40%±5%Can2"3"MIL-I-88351002175K1300000————0
    10%, 20%, 30%, 40%, 50%, 60%±5%Can4 3/4"1 9/16"MIL-I-88352002175K12000002002175K1700000
    30%, 40%, 50%±5%Can3"2"MIL-I-88351252175K11000001252175K1600000
    back to top