Butyl Rubber Mastic
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Butyl Rubber Mastic
A hand-mouldable butyl rubber mastic that fills pinholes, weld beads and irregularities before tape wrapping – and repairs coating defects.
What is the Butyl Rubber Mastic?
YTM Makina Butyl Rubber Mastic is composed of butyl rubber, synthetic resins and plasticisers. Its high malleability allows it to be moulded by hand into a compact, uniform profile over pinholes, weld beads and other imperfections before the anti-corrosion tape is applied.
It protects buried and submerged pipes, fittings, bends, tees, flanges and valves with operating temperatures up to 70 °C, and meets EN 12068 Class C50 requirements when used with the YTM EN 12068 C50 tape system. It is also used to repair coating defects and to fill gaps at the socket connections of water pipes.
Key features and benefits
- High malleability – moulded by hand
- Fills pinholes and imperfections
- Repairs coating defects
- Fills gaps at socket connections
- Available as 1 kg bar or 18 m roll
- Meets EN 12068 C50 with the YTM C50 tape system
Applications
- Girth welds and field joints before taping
- Fittings, bends, tees, flanges and valves
- Socket connections of water pipes
- Coating defect repair
- Buried and submerged pipes
Industries served
- Water transmission and distribution
- Oil and gas pipelines
Where to use butyl mastic
- Over girth weld beads before tape wrapping
- At the step between the factory coating and the bare joint
- Around fittings, valves and irregular profiles
- Socket gaps of ductile iron and steel water pipes
Technical data
| Technical characteristic | Unit | Value |
|---|---|---|
| Colour | — | Black |
| Composition | — | Butyl rubber, synthetic resins, plasticisers |
| Operating temperature | °C | −34 to +70 |
| Saponification index | mg/g | 2 |
Values are typical. Full data in the Technical Data Sheet Download the technical data sheet.
How to apply
- CleanWire-brush off rust, dirt and weld spatter; remove oil, grease or test gel with a solvent such as white spirit.
- PrimeApply YTM Primer and let it become dry and tacky.
- MouldApply the mastic with a trowel and mould it by hand over imperfections.
- WrapWrap with the YTM PE/butyl corrosion protection tape system.
Supply and packaging
| Bar, 1 kg | 5 bars / box |
|---|---|
| Roll, 3 mm × 60 mm × 18 m | 4 rolls / box |
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Frequently asked questions
What is butyl rubber mastic used for?
It fills irregularities – weld beads, pinholes, steps and socket gaps – so that the protective tape sits smoothly without voids.
Does it meet EN 12068?
It meets EN 12068 Class C50 requirements when used with the YTM EN 12068 C50 tape system.
What formats are available?
1 kg bars (5 per box) and 3 mm × 60 mm × 18 m rolls (4 per box).
What temperature range does it cover?
Operating temperature from −34 °C to +70 °C.
Can it be used with petrolatum tape?
Butyl mastic is designed for the PE/butyl tape systems. For petrolatum systems, use YTM Petrolatum Moulding Paste.
Need Butyl Rubber Mastic for your project?
Contact YTM Makina for technical support, project-specific requirements and a quotation – [email protected] · +90 542 306 40 43.