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Hull Coatings - Bottom Blacking
Traditional bottom blacking materials are based on pitch or bitumen
compounds.
For new work where bare steel is present or where pitch has been used
previously, it is preferred that pitch based coatings are used as these have a number
of advantages over bituminous systems.
Pitch is resistant to diesel and oil, has
higher protection against corrosion and is ideally suited for use with cathodic
(anodes) protection. In instances where bitumen has been used in the past or there
is uncertainty as to the type of coating present, bituminous materials should be used.
To ascertain whether a coating is pitch or bitumen, clean a small area and wipe
with a cloth dampened with white spirit. Should the coating be easily removed or
leave a heavy dark brown stain, it is likely the coating is bitumen based. If resistant
it is likely the coating is pitch based.
It is essential to ensure that with all materials adequate thicknesses of the coating
is applied and that it is completely dry before the vessel is returned to the water.
Bitumen Based Hull Coating
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Intex (Filled Bodied Bitumen Solution)
An easily brushed product suitable for both new work and as a refurbishment
coating. When used as a complete protection
on bare steel, a minimum of 3 coats must be applied
Coverage Rate: 4 sq.m per litre
Drying time: 1-3 hours
Colour: Black, semi-gloss weathers to grey
Launch time: 48 hours. |
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Coal Tar Pitch Hull Coating |
Comastic (Pitch Vinyl)
Similar to Coal Tar Pitch with superior abrasion resistance and flexibility.
Good resistance to microbial growth. An attractive matt black finish. Two to three
coats are recommended.
Coverage Rate: 4 sq.m per litre
Drying time: 1 hour in good drying conditions. Hard dry 4 hours
Colour: Matt Black
Launch time: 48 hours. |
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