Is the gasket made of foam or rubber? Are these boxes water tight?

Yes, it is a foam gasket. but "foam" did not answer the question. I don't know of any IP rating for these, but I have sprayed more than several with a garden hose to clean the exteriors off (grimy dust and grit), and not one drop got into any of the boxes. I was spraying just to clean, not to test to what degree they would stand up to, but I used both jet and spray (garden) settings with some dish soap. I can also add that these do not offer any UV protection, so if left outdoors, absolutely need to be covered and protected from the sun. Also, they are not as supple as they could be-that are just a bit on the brittle side, subject to cracking if dropped. Sometimes the pivoting handled like to pop off, and its 'brittle' nature lends itself to the plastic hazing, scuffing from moving around, becoming opaque and dingy looking.

ASIN	B00KL7VPWO
Batteries required	No
Best Sellers Rank	#120,914 in Home ( See Top 100 in Home ) #336 in Lidded Storage Bins
Customer Reviews	4.4 4.4 out of 5 stars (1,948)
Date First Available	17 June 2014
Is assembly required	No
Item Weight	2.04 kg
Item model number	19344304
Number of pieces	1
Product Dimensions	57.15 x 40.64 x 32.39 cm; 2.04 kg

Sterilite 54 Qt Gasket Box, Stackable Storage Bin with Latching Lid and Tight Seal, Plastic Container to Organize Basement, Clear Base and Lid, 4-Pack

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