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Bitumen Joint Sealant:
 
Plastiseal

 

Rubberised bitumen, mastic joint sealant compatible with bitumen based

Membranes

 

Uses

 

For sealing joints in retaining walls, roofing (sealing horizontal chases, flashings, gutterings and sheet laps), sealing terminations of bitumen based waterproofing

membranes

 

Advantages

 

Firm, flexible weather resistant seal

Excellent slump resistance

Suitable for permanent immersion in water

Compatible with asphalt or bituminous surfaces

Resistant to alkalis and sulphates

Easy to apply

 

Description

 

A flexible, gun applied sealant based on a combination of bitumen and synthetic rubber. Dries to form a rubbery seal with excellent slump resistance. Plastiseal has good resistance to biodegradation, and is suitable for sealing lap joints in gutters and drainage channels where ponded water may reside. Also suitable for general sealing or pointing work in roofing and flashing applications.

 

Design criteria

 

Joint configuration

 

Joints should be of a size to permit adequate application of Plastiseal. Very narrow joints are difficult to seal effectively and for most applications 5 mm should be considered as minimum width. Maximum joint width should not exceed 40 mm. Movement accommodation factor Joints should be designed so that total cyclic movement in tension or compression does not exceed 10% of the joint

width at time of sealing. Total movement in shear should not exceed 20% of joint width at time of sealing.

 

Where a neat joint finish is required, cover the joint face edges with masking tape before Plastiseal application and remove the masking tape immediately after the sealing work has been completed.

 

Priming porous surfaces

 

Non-moving joints normally do not require use of primer, however excessively porous surfaces or friable surfaces may need priming. Priming non-porous surfaces Not normally required. Where necessary, metal surfaces should be cleaned using Solvent 10. Ferrous metals should be treated with an anti-corrosion primer.

 

Application

 

Plastiseal may be applied by gun direct from the cartridge or by trowel. When loading cartridges into gun ensure nozzle is cut to the required length and angle, and that the cartridge membrane has been punctured. Hold gun firmly against joint at a constant angle of about 45 degree. Guide nozzle along the joint gradually, ensuring good contact with joint surface. Never pump the trigger hard.

Wipe the nozzle occasionally to ensure a clean extrusion. After sealant has been applied, it should be tooled to a slightly concave surface with a wooden spatula, which may be moistened with White Spirits or similar solvent.

 

Clean up

 

To be removed from equipment immediately after use with a solvent such as Solvent 10 or White Spirits. Do not use solvents on hands, use suitable proprietary skin cleaner.

 

Water immersion

 

Plastiseal is suitable for permanent immersion in water, however, it is essential to allow full solvent evaporation from sealant prior to water immersion. This will take about 7 - 10 days at 15 C, longer if temperatures are lower or the Plastiseal is deeper than 20 mm.

 

Maintenance

 

Mechanical damage may be repaired at any time - ensure that surface is clean, dry and free of foreign matter to allow good adhesion of new to old Plastiseal.

 

Estimating

 

Plastiseal: 600 ml cartridge

Solvent 10: 4 and 20 litre drums

 

Guide to Plastiseal quantities

 

Joint size width x depth (millimetres)

Length of joint sealed

per 600 ml cartridge (metres)

10 x 20

3.0

15 x 15

2.6

15 x 20

2.0

20 x 20

1.5

20 x 25

1.2

20 x 30

1.0

25 x 25

1.0

 

Storage

 

12 months, stored in cool dry conditions in original, unopened containers.

 

   

 

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