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Sylmasta CrackSeal Cast Iron Pipe Sealant 10oz Cartridge
Moisture-curing pipe sealant which seals cracks and splits in cast iron waste, drain and soil pipes where water is not leaking through. Can also be used to fill longitudinal splits in other materials prone to cracking, including steel, concrete and anodized aluminum.
- Sets Black - Matches Cast Iron
- Fast Hardening
- Sets on Dry and Wet Surfaces
$22.59
Availability:
In stock
( 40 Available )
SKU
22865
Sylmasta CrackSeal Cast Iron Pipe Sealant – 10 oz Cartridge
CrackSeal is a moisture-curing pipe sealant formulated to seal cracks and longitudinal splits in cast iron waste, drain, and soil pipes. It extrudes directly into the damaged area, skins in about 10 minutes, and hardens rapidly to stop leaks—even on damp substrates. The black color blends with cast iron, and the non-isocyanate, low-odor formula is paintable after cure. Supplied in a standard cartridge for use with a common sealant gun.
Key Features
- Skins in ~10 minutes; hardens quickly to seal active weeps.
- Adheres to wet surfaces; black finish matches cast iron pipework.
- Moisture-curing, silicone-free; contains no diisocyanates.
- Low odor during application; paintable after cure.
- Standard cartridge application with a common caulk gun.
- High elasticity and toughness for durable seals.
Applications
- Cracks and longitudinal splits in cast iron drain, waste, and soil pipes.
- Use on other pipe materials where pressure is off, including steel, concrete, and anodized aluminum.
- Quick sealing prior to permanent repair where access is limited.
Technical Specifications
| Packaging (this item) | 310 ml cartridge (approx. 10 oz); ~0.52 kg; includes nozzle |
| Skin Formation | ~10 minutes (ambient temperature dependent) |
| Curing Speed | ~4 mm per 24 hours @ 23°C |
| Elongation at Break | >300% |
| Shore A Hardness | ~40 |
| Lap Shear Resistance | ~1.2 MPa |
| Modulus at Break | ~0.7 MPa |
| Specific Gravity | ~1.06 |
| Shrinkage | ~6% |
| Service Temperature Range | −40°C to 90°C (intermittent to 150°C) |
| Coverage | ~1 meter of crack at 10 mm width per 310 ml cartridge |
| Storage / Shelf Life | 12 months unopened when stored 5–25°C in dry, well-ventilated area |
| Cleanup (uncured) | White spirit; once hardened, remove mechanically or with specialist remover |
| Color | Black |
Frequently Asked Questions
How do I apply CrackSeal?
Clean the pipe to remove debris, oil, and grease. Pierce the cartridge seal, fit the nozzle, cut at 45°, and gun CrackSeal directly into the crack until fully filled. Tool with a spatula dampened with water and a small amount of detergent.
Will it work on damp pipe surfaces?
Yes. CrackSeal adheres to wet surfaces, but the substrate should be as dry as possible for best results.
Is it suitable for pressurized lines?
Use on drains, waste, soil, and other services where pressure is off. It is not intended for pressurized piping.
Can I paint over the repair?
Yes—CrackSeal is paintable after cure.
How much will one cartridge cover?
Approximately 1 meter of a 10 mm-wide crack per 310 ml cartridge.
How do I clean up?
Remove excess immediately with white spirit. Cured material must be removed mechanically or with a specialist remover.
What are the storage recommendations?
Store cartridges between 5–25°C in a cool, dry, well-ventilated area. Shelf life is 12 months unopened.
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