Metacaulk® Box Guard™

Metacaulk® Box Guard™


  • adheres to back of electrical box
  • non-conductive
  • highly intumescent
  • STC rating 53
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Metacaulk® Box Guard™ is a highly intumescent, fire-rated pad for use in electrical boxes. When complying with the “24 inch rule”, it is inserted on the inside back wall of an electrical box.

When exposed to fire, Box Guard™ will expand forming a char that will seal off the opening and prevent the spread of flames and limit the temperature rise on the unexposed surfaces. A labor saving, economical alternative to putty pads. Great for retrofit jobs. STC 53 Rating, Tested in a UL 411 wall assembly/section to ASTM E90.


Product Codes And Case Sizes
Product CodeSizeQuantityUPCInterleavedDimensionsCubic Feet
66366 Single 50NA10021449663660 10x4x4 .09
66367 Double 50NA10021449663677 4x8x8 .19
66369 Double for 5.S box 50NA10021449663691 8x8x5 .19