Sika Black Jack 903 Bitumen Trowel Mastic – heavily-filled, fibre reinforced, trowel applied bitumen
Sika® Black Jack®-903 Bitumen Trowel Mastic is a trowel-applied, black, heavily-filled bituminous compound with added fibres for reinforcement. The product forms a surface skin, but the mass below remains soft to allow for moderate movement. Suitable for sealing and filling holes in mastic asphalt, roofing felt, corrugated iron, metal guttering and downpipes.
Key benefits
- Fast drying
- Fibre-reinforced
- Suitable for use with all bituminous surface coatings
- Remains flexible for long periods after application
Typical applications
Mainly used for:
- Waterproofing, stopping, bedding, bonding and sealing
- Adheres to/fills holes in: mastic asphalt, roofing felt, corrugated iron, cast iron, fibre cement, slates, lead, copper, zinc, concrete and timber
Technical information
| Property |
Value |
| Colour |
Black |
| Pack sizes |
1L, 2.5L, 5L |
| Shelf life |
24 months |
Available sizes and packs
| Colour |
Size |
Sold as |
Units per box |
Code |
| Black |
1L |
Each |
12 |
852672 |
| Black |
2.5L |
Each |
1 |
852673 |
| Black |
5L |
Each |
1 |
852674 |
1L – Sold as a box of 12. Price shown is per box of 12.
Health and safety
Signal word: Danger (H372, H372, H336, H304, H411, H226). Read the Safety Data Sheet before use.
Download the Sika Black Jack 903 Bitumen Trowel Mastic technical data sheet (PDF)
Download the Sika Black Jack 903 Bitumen Trowel Mastic safety data sheet (PDF)
Delivery: 4–6 days. Free delivery on orders over £75.