MacWrap (Mar-Mac Manufacturing Co., Inc.)

MacWrap Collar

The MacWrap collar is made up of two layers. The bottom layer (next to the pipe) is made of a tough, woven polypropylene fabric with a thick rubberized mastic coating with a peelable protective paper that is removed when the collar is applied to the pipe. The outer layer consists of an impervious polyethylene with a rubberized mastic that is bonded to the bottom layer. Between these layers are steel straps sheathed in tubes that allow the straps to slip freely and tighten around the pipe.

The ends of the two layers are off-set so that in applying to the pipe the bottom layer overlaps itself. The straps are secured and the top layer then covers the exposed portion of strap, completing the joint. The collar comes complete, ready for application.

TYPICAL PROPERTIES
Polyethylene Backing -	Tensile strength, min psi	- 4,000	- D882, Method A
	Elongation at break, min, %	-100	- D882, Method A
	Tear resistance, min, psi	-1,500	- D624, Die C
	Water absorption, max, %	-0.01	- D570
Reinforcing Mesh Element -	Tensile strength, min, lb, in.		- D1682
	Warp 75
	Fill 75
	Elongation at break, min, %
	Warp 20
	Fill 20

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