The Best Solution for Jointing Concrete Structures
MacWrap TYPES
MarMac MacWrap is a highly-advanced, external joint coupler designed to permanently prevent infiltration at precast concrete structure connections, including reinforced concrete pipe (RCP), manhole sections, box culverts & stormwater retention systems, and many other round or elliptical concrete structures.
Overbuilt to be the best.
MacWrap integrates several unique components into a single, customizable, full-perimeter, external sealing band. Our specially formulated mastic provides a positive seal, battling infiltration. The coupler is reinforced by internalized woven polypropylene with a heavy duty polyethylene backing and secured by high-tensile compression bands with tensioning ratchets.
POLYETHYLENE BACKING
Heavy-duty, cross-laminated top layer, available with UV & chemical resistance
WOVEN POLYPROPYLENE
Puncture & shear resistant reinforcement layer sandwiched between mastic sealant
COMPRESSION BANDS
High-tensile compression straps tighten to create an impermeable mechanical seal
RUBBERIZED MASTIC
Specially formulated, rubberized mastic aggressively adheres to all concrete surfaces
Features & Benefits
- Strong, permanent, shear & puncture resistant
- Easily installed & immediately inspectable
- Millions of couplers spanning several decades with nearly a 100% success rate
- Full-perimeter, positive seal = infiltration-proof
- Specially formulated mastic layer
- Heavy-duty, high quality construction
- Protection from corrosion, acids & alkali (MacWrap CR)
Over the course of several decades with very few manufacturing iterations, millions of MacWraps have been installed around the world. With nearly a 100% success rate, MacWrap is the proven, premiere solution for the most challenging of installations, and the “go to” solution for when it really matters. MarMac MacWrap is designed to be installed in the worst field conditions, always succeeding where competitors’ products fail, and an excellent choice for both the rehabilitation of failed joints and new installations.
Coupler composition:
- Heavy duty polyethylene backing
- Internal woven polypropylene
reinforcement - High-tensile compression bands
- Specially formulated mastic contact layer
MarMac MacWrap Couplers meet or exceed all requirements set by ASTM C877 (Type II) and ASTM C1244.
| MIN | MAX | |
|---|---|---|
| RUBBERIZED MASTIC | ||
| Ash-inert matter | 8% | 15% |
| Volatiles | 0.1% | 2.0% |
| Softening temp | 175°F | |
| Specific gravity | 0.95 | 1.05 |
| Penetration | 60 dmm | 90 dmm |
| Flow | 10 mm | 10 mm |
| POLYETHYLENE BACKING | ||
| Tensile strength | 4000 psi | |
| Elongation at break | 100% | |
| Tear resistance | 1500 psi | |
| Water absorption | 0.01% | |
| REINFORCING MESH ELEMENT | ||
| Tensile strength (Warp) | 75 lb/in | |
| Tensile strength (Fill) | 75 lb/in | |
| Elongation at break (Warp) | 20% | |
| Elongation at break (Fill) | 20% | |
AVAILABILITY
MacWrap for RCP
MacWrap for Manholes
MacWrap for Box Culverts
Chemical Resistant MacWrap
APPLICATIONS
Bell-and-spigot RCP
Tongue-and-groove RCP
RCP Repair
Manholes
Manhole Repair
Box culverts
In-ground applications
Above-ground applications
More
MacWrap for RCP
External Seals for Reinforced Concrete Pipe Joints
MarMac’s MacWrap for RCP is a high performance, external joint coupler designed for the prevention infiltration and exfiltration at joints of bell-and-spigot as well as tongue-and-groove reinforced concrete pipe.
MacWrap’s specially formulated mastic is designed to aggressively adhere to the exterior concrete pipe surface, with the tightened mechanical straps creating an indestructible seal. MacWrap for RCP is permanent, immediately inspectable, and boasts a 100% success rate. Simply put, MarMac MacWrap is the best there is.
MacWrap for MANHOLES
External Seals for Precast Manhole Structures
MarMac’s MacWrap for Manholes is an advanced external joint coupler specifically designed for preventing infiltration at connections of manhole sections.
MacWrap is designed to be installed in the worst field conditions, permanently protecting manholes from infiltration and exfiltration. MacWrap succeeds where other products fail.
MacWrap for BOX CULVERTS
External seals for stormwater retention systems & 4-sided structures
CHEMICAL RESISTANT MacWrap
External Seals for RCP with Hydrocarbon Solvent Resistance
Chemical Resistant Macwrap (MacWrap CR), is engineered to be a permanent external sealing band for RCP of all shapes and sizes. MacWrap CR is typically specified for gravity flow applications, such as Stormwater and sanitary sewer when installed in contaminated soils, principally Hydrocarbon based. MacWrap CR will prevent groundwater from entering the system at the joint, as well as maintain the joint integrity even given less than perfect bedding conditions. MacWrap CR has a proven track record spanning over 3 decades, as an assurance against joint failure and joint rehabilitation.
MacWrap CR’s structure includes a proprietary co-extruded, multi-layer barrier film laminated to the outside of the coupler. This film has been tested per ASTM F 739 against a battery of chemicals at 95% concentration for permeation resistance with excellent results, including benzene, toluene and other hydrocarbon-based solvents. A complete list of test results is available upon request.
