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Sylmasta CrackSeal Sealant Black 310ml
Sylmasta CrackSeal is a moisture-curing black sealant for cracks and splits in cast iron waste, drain, and soil pipe on facilities and drain repair jobs. Extrude it into the crack from the 310ml cartridge so crews can seal longitudinal splits and restore leaking cast iron without cutting out and replacing the pipe.
- Seals cast iron drain and soil cracks, including wet surfaces on pressure-off lines.
- Keeps repaired pipe looking uniform with black sealant that matches cast iron stacks.
- Pressure-off steel, concrete, and anodized aluminium repairs stay in the same kit workflow.
$24.20
Availability:
In stock
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Sylmasta CrackSeal Cast Iron Pipe Sealant - 310ml
Sylmasta CrackSeal is a moisture-curing black pipe sealant for cracks and splits in cast iron waste, drain, and soil pipe in public, commercial, and residential buildings. Extrude the 310ml cartridge into the damage until it is filled so facilities and drain crews can seal longitudinal splits on pressure-off lines, including wet cast iron, without cutting out and replacing the pipe.
Key Features
- Seals cracks and longitudinal splits in cast iron waste, drain, and soil pipe on facilities and drain jobs.
- Stays workable on wet cast iron so pressure-off lines can be sealed without full drydown.
- Extrudes from a 310ml sealant cartridge with a standard sealant applicator (not supplied).
- Keeps the finished repair looking uniform with black sealant that matches cast iron pipework.
- Covers pressure-off steel, concrete, and anodized aluminium when those materials sit beside cast iron on site.
- Fills up to 1000mm of crack from one cartridge based on a 10mm-wide fill on the CrackSeal TDS.
- Leaves a silicone-free, low-odour, paint-ready surface for indoor stack and soil pipe work.
Technical Specifications
| Property | Value |
|---|---|
| Product code | CS-BLACK-310ml |
| Presentation | 310ml cartridge (0.52kg) with nozzle |
| Colour | Black |
| Skin formation | Approximately 10 minutes (temperature dependent) |
| Curing speed | 4mm per 24 hours at 23°C |
| Coverage per cartridge | 1000mm based on a 10mm-wide crack |
| Service temperature | -40°C to 90°C (intermittent 150°C) |
| Shore A hardness | 40 |
| Elongation at break | >300% |
| Shelf life | 12 months at 5–25°C |
Product documents: Sylmasta CrackSeal Technical Data Sheet
Frequently Asked Questions
What pipe jobs is Sylmasta CrackSeal built for?
Sylmasta CrackSeal is a moisture-curing black sealant for cracks and longitudinal splits in cast iron waste, drain, and soil pipe. Facilities teams, drain repair crews, and maintenance contractors use it on pressure-off lines in public, commercial, and residential buildings when they need to fill cracked cast iron without cutting out and replacing the pipe.
How do crews apply Sylmasta CrackSeal to a cracked pipe?
Clean the pipe so it is free from oil and grease and as dry as practical. Pierce the metal seal on the tip of the Sylmasta CrackSeal cartridge, screw on the nozzle, and cut the nozzle to size at a 45 degree angle. Insert the cartridge into a standard sealant applicator (not supplied), push out the base seal, and extrude CrackSeal into the crack until the damage is completely filled. Smooth with a spatula dipped in water containing a little detergent. Clean excess immediately with white spirit. Wear gloves and follow the Safety Data Sheet.
Which materials can Sylmasta CrackSeal seal besides cast iron?
Besides cast iron waste, drain, and soil pipe, Sylmasta CrackSeal can be used on other pipe materials where pressure is off, including steel, concrete, and anodized aluminium. Always confirm pressure-off conditions and surface prep before sealing.
How much crack will one Sylmasta CrackSeal 310ml cartridge fill?
One Sylmasta CrackSeal 310ml cartridge fills approximately 1000mm (one metre) of cracked pipework based on a 10mm-wide crack, per the CrackSeal TDS. Wider or deeper cracks use more sealant, so keep a spare cartridge on longer runs.
What cure times and service temperatures does Sylmasta CrackSeal offer?
Sylmasta CrackSeal forms a skin in approximately 10 minutes depending on ambient temperature and cures at 4mm per 24 hours at 23°C. Service temperature range is -40°C to 90°C, with intermittent exposure up to 150°C. Shore A hardness is 40, elongation at break is greater than 300%, and lap shear resistance is 1.2 MPa on the CrackSeal TDS.
What is supplied with Sylmasta CrackSeal, and what is not included?
Sylmasta CrackSeal (CS-BLACK-310ml) is supplied as a 310ml black cartridge weighing 0.52kg with a nozzle. A standard sealant applicator is not supplied. Unused sealant retains its properties inside the cartridge for 12 months when stored between 5°C and 25°C in cool, dry, well-ventilated conditions. CrackSeal contains no diisocyanates, is silicone free, low odour, and can be painted over.
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