Humidity sponges meet all drying requirements. One bag will retain 16% moisture in a container with a volume of two gallons (476 cu. in.) The sponges are non-toxic and are Class M3.5 cleanroom-compatible.

Model 07193-13 has Tyvek^® on both sides and may be regenerated
in a 220°F oven and reused repeatedly. A relative humidity card is
included in each pack to show when bags need to be regenerated.