Waterproof sealing membrane for precast structures
SealWrap
Options
MarMacʼs SealWrap is a high performance waterproofing membrane used for sealing the joints of precast concrete structures. Compared to other sealing membranes, SealWrap is considered heavy duty due to its puncture & tear resistant internal reinforcement layer.
SealWrap comes in easy-to-transport rolls available in multiple widths, and is also available as a complete repair kit . The product is not appropriate for use over expansion joints or joints that move.
*Custom roll lengths & widths (up to 36″) available upon request.
Features & Benefits
- Aggressive tack & initial adhesion to all concrete surfaces
- Continuous adhesion after backfill
- Puncture & tear-resistant
- Infiltration & exfiltration-resistant
- Resistant to drying, oxidation & hardening
- Primer not typically needed
- Economical & effective
- Available in a range of sizes
Designed for durability.
The product is composed of three separate elements: a proprietary, bitumen-derived mastic; a durable polyethylene backing; and an internal reinforcement layer of puncture and tear-resistant, woven polypropylene. These elements are cross bond laminated during production to create an inseparable, multi-layer wrap.
POLYETHYLENE BACKING
Heavy-duty, cross-laminated top layer
RUBBERIZED MASTIC
Specially formulated, rubberized mastic aggressively adheres to all concrete surfaces
WOVEN POLYPROPYLENE
Puncture & shear resistant reinforcement layer sandwiched between mastic sealant
RELEASE FILM
A protective, peelable release film protects the mastic until ready for use
SealWrap meets or exceeds all material requirements of ASTM C877 Type II, with the exception of strapping and strap sheathing, as it intentionally lacks strapping to meet the demand of a broader range of applications (See MacWrap for full C877 Type II compliance).
SealWrap also exceeds many of the C877 Type III requirements, however, the mastic in SealWrap is bitumen-based as described in C877 Type II rather than butyl-based, as is called for in Type III.
Parts of ASTM C990 are commonly referenced for exterior wraps. SealWrap meets the physical requirements for Bitumen Sealants with the exception of the softening point. MarMacʼs mastic softening point is, by design, much lower (175°F) than the specified 320°F. Our material is designed for limited and controlled softening at any temperature above 40°F to achieve a unique initial tack strength and so the material continuously bonds with the concrete’s porous surfaces.
| 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% | |
SealWrap should be stored in its original packaging, out of direct sunlight, protected from the elements. Material should be kept away from direct heat, sparks and open flame. For optimum results, SealWrap should be stored in a tepid (60-80°F) environment prior to installation.
The surface of the structure to be sealed should be clean of dirt and debris. The surface should be as dry as possible in field conditions. Specified width of wrap shall be placed against the structure, mastic side to the structure, spanning the joint to be sealed. The protective release film shall be removed from the edge of the wrap and be applied to the structure wall centering the joint gap. Continue to remove the release film as the wrap is applied in full circumference, while keeping hand tension to prevent wrinkling, ensuring adhesion and alignment. The wrap should overlap itself a minimum of half of the SealWrapʼs width with the overlap at the top of the pipe in an accessible position. Hand press the overlapped edges to ensure a seal.
OPTIONS
SealWrap Roll
SealWrap Repair Kit
AVAILABILITY
Roll Width: 6, 9, 12, 16, 20, 28”
Roll Length: 60′
Thickness: 3mm
APPLICATIONS
Reinforced Concrete Pipe
Box Culverts
Manhole Sections
Detention & Retention Systems
Burial Vaults
Tornado Shelters
Arches
Spans
SealWrap Repair Kit
Convenient Kit for Gravity-Flow Pipe & Infrastructure Repairs
MarMacʼs SealWrap comes in a convenient, preassembled kit with everything needed to repair and/or prevent inflow or infiltration into the joints of gravity flow pipe systems or precast concrete structures. SealWrap Repair Kit includes:
- MarMac SealWrap
- Coated Compression Bands (5/8” x 150ʼ)
- 5/8“ Seals 1
- Strap Sealing Tool
- Strap Tensioning Tool
1 Tensioning ratchets can be supplied for no-tool installation.
Manhole Wrap Packs
Cut-To-Length Rolls & Spray Adhesive for Manhole Joints
- 6” wide rolls of cut-to-length SealWrap
- One can of general purpose Camie® 343 Spray Adhesive
