Product Overview

PRODUCT DATA SHEET
METACAULK
®
BOX GUARD™
Fire-rated insert for electrical boxes
April 2017
For list of systems see metacaulk.com.
limiting the temperature rise on
the unexposed surfaces.
When Metacaulk
®
BOX GUARD
™
is used as directed, the horizontal
separation between outlet boxes
on opposite sides of the wall may
be less than 24 inches.
4. Installation
Instructions
Metacaulk
®
BOX GUARD
™
is
easy to install. Make sure rear
surface is clean, dry and not con-
taminated. Remove protective
paper from tape and stick pad
to inside back wall of electrical
box*. Center pad from top and
bottom of box. Install switch, or
outlet. Use the single pad for a
single box (2" x 4"), and double
pad for double box 4" x 4", and 4
3/8" x 4 3/8" pad for 4 11/16" x 4
11/16"box. Make sure installa-
tion complies with NEC 314.16
(formerly 370.16) or other ap-
plicable codes.
Consult UL Directory for complete
instructions and system listings.
*If necessary, a maximum 3/8" hole
may be created or the pad may be
slit from one edge to allow easier
access to the electrical box ground
screw.
2. Material Properties
Asbestos Fillers None
Solvents None
Hazardous Ingredients None
Sizes (Approx.)
Single box:
1 13/16" x 2 13/16" x 1/4"
47 mm X 71 mm x 6 mm
Double box (two sizes)
1) 3 11/16" x 3 3/4" x 1/4"
94 mm x 95 mm x 6 mm
2) 4 3/8" x 4 3/8" x 1/4"
111 mm x 111 mm x 6 mm
Color Black
ASTM E 84, UL 723 Tunnel Test
Flame Spread 5
Smoke Index 5
Sound Transmission Class
STC Rating 53*
*Tested in a UL 411 wall assembly/section to ASTM E90
3. Applications
Use Metacaulk
®
BOX GUARD
™
on inside back panel of electrical
boxes to maintain the integrity of
re rated wall assemblies restrict-
ing the passage of flames and
1. Product Description
Metacaulk
®
BOX GUARD
™
is a
one component re rated pad
for use in electrical boxes. It
is inserted on the inside back
wall of an electrical box, and is
a highly intumescent firestop
material. When exposed to re,
Metacaulk
®
BOX GUARD
™
will
expand forming a char that will
seal off the opening and prevent
the spread of ames and limit
the temperature rise on the un-
exposed surfaces.
Metacaulk
®
BOX GUARD
™
is
applied by hand, and must
comply with NEC 314.16 (for-
merly 370.16) or other appli-
cable codes. U.S. Patent No.
6,207,085 & 6,252,167.
Metacaulk
®
BOX GUARD
™
Features
* Easy to Install
* Cost Effective
* Highly Intumescent
* Adheres to Back of Electrical
Box
* Non-Conductive
* Dielectric Breakdown
Voltage 22V/mil
(ASTM D 149)