CrackSeal Cast Iron Pipe Sealant
CrackSeal Sealant is moisture-curing pipe sealant which instantly seals cracks and splits in cast iron waste, drain and soil pipes. It is also effective repairing longitudinal splits in steel and concrete lined pipework.
It extrudes from its cartridge using a standard sealant gun directly into the crack or split requiring repair. CrackSeal will harden almost instantly to fill the leak, forming a skin in approximately 10 minutes depending on ambient temperature.
CrackSeal adheres to wet surfaces and even seals when water is leaking through a pipe at low-pressure. It is temperature resistant to 150°C and withstands pressure up to 10 bar after reaching maximum properties.
It is black-coloured to appear almost uniform with cast iron. CrackSeal is silicone free, low odour and can be painted over.
Unlike some other sealants, CrackSeal contains no diisocyanates. It is therefore not covered by the 2023 EU and UK REACH legislation governing the safe use of diisocyanates and requires no mandatory safety training before use.
How to fix a cracked cast iron pipe using CrackSeal Sealant
The pipework undergoing repair should be clean and free from oil and grease before application. Although CrackSeal adheres to wet surfaces, the pipe should be as dry as possible.
CrackSeal comes in a 310ml cartridge. The user pierces the metal seal on the tip of and screws on the nozzle. The nozzle is then cut to the desired size at a 45° angle.
A standard sealant gun applies CrackSeal. The cartridge is inserted and the base pushed out. The user then extrudes CrackSeal directly into the crack until it is full.
If necessary, CrackSeal can be smoothed with a spatula or similar tool dipped in water which contains a little detergent.
A 310ml CrackSeal cartridge will fill approximately one metre of cracked pipework based on a 1cm wide crack (One cartridge per yard if the crack is 1/2″).
CrackSeal will set instantly, forming a skin after approximately 10 minutes. Any unused CrackSeal will retain its properties inside the cartridge for 12 months.
Reinforcement with SylWrap HD Pipe Repair Bandage
Sylmasta recommend reinforcing repairs made with CrackSeal by overwrapping the sealant with a SylWrap HD Pipe Repair Bandage.
SylWrap HD is a water-activated composite wrap. It sets rock-hard in minutes to form an impact resistant layer of protection covering CrackSeal for a permanent repair.
CrackSeal and SylWrap HD can be purchased together in the SylWrap Cast Iron Pipe Repair Kit or the Drain & Waste Pipe Repair Kit.
The Cast Iron Kit also contains Superfast Steel Epoxy Putty for making a single pipe repair. The Drain & Waste Kit is more specialised and enables multiple repairs including live leaks to cast iron and plastic drain, waste and soil pipes.
As well as CrackSeal, Superfast Steel and SylWrap HD, it contains Wrap & Seal Pipe Burst for online leak sealing and SplitFill Epoxy Adhesive for splits and gaps in plastic pipework.
CrackSeal Sealant Applications
- Sealing cracks and splits in cast iron waste, drain and soil pipes
- Repairs of steel and concrete-lined pipework at low pressure
Benefits of CrackSeal Sealant
- Easy to use – no mixing required, extrude directly into crack requiring repair
- Coloured black to appear almost-uniform with cast iron pipework
- Sets almost instantly, even on wet surfaces and with water leaking through
- Silicone free, low odour and contains no diisocyanates
Technical Data
- Shore A Hardness:
40
- Lap Shear Resistance:
1.2 MPa
- Shrinkage:
6% approximately
- Elongation at Break
>300%.
- Specific Gravity:
1.06
- Curing Speed @ 23°C
and 50% RH
4mm per 24 hours
- Coverage per 310ml cartridge
1 metre if crack is 1cm wide
- Skin Formation
Approximately 10 minutes
- Upper Temperature Limit:
90°C continuous.
150°C intermittent.
Full TDS Downloads
CrackSeal Sealant Pipe Repair Case Studies
Hospital Maintenance Worker Makes Cast Iron Waste Pipe U-Bend Repair from Top of Ladder
Cast Iron Soil Pipe Leaking Wastewater in Roof Space Above Hospital Ward Repair
Hospital Seal 1.05-Metre Long Crack in Cast Iron Downpipe Leaking Rainwater into Ward
CrackSeal Pipe Sealant Videos
CrackSeal Sealant and SylWrap HD seal 450mm split in cast iron pipe
This demonstration video filmed at Sylmasta HQ shows CrackSeal repairing a 450mm long split cut into a cast iron test pipe.
Sylmasta Non-Flammable Degreaser cleans the pipe with CrackSeal then extruded directly into the split. The repair finishes with SylWrap HD adding reinforcement.
A bucket of water is then poured into the pipe. Nothing leaks through, showcasing the strength of the repair.
Cast iron pipe repair with water leaking through resistant to 10 bar
Product testing at Sylmasta HQ assesses the live leak repair capability and pressure resistance of CrackSeal.
The sealant extrudes into a horizontal split in a cast iron test piece whilst a steady stream of water is leaking through.
CrackSeal achieves maximum properties in 24 hours, after which the repair is pressure tested. It withstands up to 10 bar. SylWrap HD then gives the pipe added strength.
Please use the form to enquire about the price and availability of CrackSeal Sealant
Other Cast Iron Drain, Waste & Soil Pipe Repair Products
SylWrap Cast Iron Pipe Repair Kit
The Cast Iron Pipe Repair Kit contains all the products needed to permanently repair longitudinal splits and cracks in cast iron where there is no water pressure.
Number of Repairs: Single
Pressure Resistance: Up to 30 bar
Temperature Resistance: Up to 200ºC
Live Leaks: No
SylWrap Drain & Waste Pipe Repair Kit
The Drain & Waste Pipe Repair Kit is a specialist kit for end-users such as facilities management teams frequently required to seal cracks and splits in cast iron and plastic drain, waste and soil pipes.
Number of Repairs: Multiple
Pressure Resistance: Up to 30 bar
Temperature Resistance: Up to 200ºC
Live Leaks: Yes
Wrap & Seal Pipe Burst Tape
Wrap & Seal is a WRAS approved waterproof pipe repair tape for sealing lives. It stretches by 300% as it is wrapped, forming a solid rubber band containing pipe content.
Number of Repairs: One
Pressure Resistance: Up to 30 bar
Temperature Resistance: Up to 200ºC
Live Leaks: Yes