Polytek PolyPurge Dry Gas Blanket - Shelf Life Extender for Urethane Liquids, 10 oz

Once a container of polyurethane part A or part B has been opened, the humid air sitting on top of it is the problem. Moisture reacts with the isocyanate side, and the next pour comes out foamy, full of bubbles or soft. PolyPurge is Polytek's answer: a dry, heavier than air gas you spray into the container right before the lid goes back on. It sinks onto the liquid, pushes the damp air out of the way, and extends the shelf life of whatever is left in the can. Specs Type dry gas blanket in an aerosol can, nonflammable Use with opened polyurethane part A and part B: urethane mold rubbers, casting plastics and two part pour foam Gas 1,1,1,2-tetrafluoroethane (HFC-134a), heavier than air, no ozone depleting materials Net contents 10 oz (283 g) per can, with an extension nozzle for narrow openings Sizes single can, case of 12 cans Use class industrial and professional use only Shipping UN1950 Aerosols, Division 2.2, limited quantity. Ground only, lower 48 states How to use it Pour what the job needs and wipe the container rim clean. Fit the extension nozzle and direct the gas into the head space above the liquid, not at the liquid itself. Reseal the lid tight straight away, while the blanket is still sitting on the surface. Repeat every time that container gets opened. This is the cheapest insurance there is on a part-used pail of urethane. It is worth having on the shelf next to two part pour foam and Hi-Bond pour foam, both of which carry a moisture sensitive isocyanate side, and alongside Pol-Ease 2300 on a urethane rubber bench. Safety: contents under pressure, may burst if heated. Do not puncture or incinerate the can and keep it out of direct sun. The gas displaces oxygen, so use it with ventilation and never in a confined space. Data sheets: Polytek PolyPurge SDS