HYDROSORBENT SG-40 Silica Gel Dehumidifier Desiccant 40 Gram Orange/Green No Cobalt (II) Chloride 5 pack 40 Gram Silica Gel 5-Pack 5

I've been using this for years. If you received a damage one, request a replacement for it or return it. With that said, these work great. I would "activate" them before using the first time and to keep them from opening (I dropped one before and the beads went EVERYWHERE), user a rubber band. Just remember to remove the rubber band before you put it in the oven to "activate." Also set a 4-6 month reminder (or whenever depending on how fast they absorb moisture for you in your situation), otherwise they will be less effective over time.

I ordered eight of these for ammo cans. When I received these they had small dents in the metal, which I noted. I then reordered five more and they were packaged better and came in perfect condition. The orange light was not as noticeable as in the photograph. Everyone said you did not have to put these in the oven upon receipt. Just to be sure I put them in the oven for the required three hours. They are expensive, but if they last a life time and work well then I am willing to play the extra amount. By putting them in a small air tight ammo can, I would think that they would last a long time without having to reheat them in an oven. I have not had them long enough to be able to judge this.

These seem to be working. But all five came in a sealed bag which clearly states that in order to remove moisture, they are to be placed in the over for 2-3 hours AND NOT EXCEED 200-240 F. The metal tins say 300F! So maybe it's because it's not the cobalt formulation? Maybe that's why some people experienced the window clouding? I don't know, but I relabeled my tins with a Sharpie staying in the 200-240 F range.

I use this product to protect ammunition in army surplus ammunition cans. The product seems to be well built and appears solid. My only real issue is that is comes in a resealable five pack and the packets are not individually wrapped. I only used three of the five packets when I opened the five pack and am afraid I will have to re-activate the other two packets in an oven when I get ready to use it. Not a great problem and I will probably order more of the five packs from this vendor.

I bought these and had them brought to South America with some friends. I live in a very humid climate, but these don't seem to absorb much moisture. They silica gel start off orange and then turn clear when they have absorbed water from the air. The instructions say to bake them in an oven at 350 degrees for 1/2 hour. I've done so several times, and the silica gel beads turn clear again almost immediately. So, did they not dry in the oven long enough or do they not really "recharge"? The other thing is that the containers are not actually fastened closed in any manner, so if you pick it up upside down (the top is not clearly marked), or you drop it, you have little silica gel beads rolling all over the floor.