TECHNICAL DATA SHEET
BOSTIK SUPER GASKET
Description
BOSTIK SUPER GASKET is a neutral curing black polymeric
sealant which cures on exposure to atmospheric moisture to a
tough, flexible elastomeric silicone rubber capable of
withstanding temperature extremes (-60°C to +300°C) and
resisting water, mineral oil, transmission fluid, and anti-freeze.
It is also excellent for use as an adhesive where an elastic gap
filling bond is required
Features & Benefits
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Heat resistance up to +300°C (short term exposure)
Heat resistance up to +260C (continuous exposure)
Non corrosive to metals
Suitable for alkaline substrates such as concrete and plaster
Will not desilver or discolour mirrors – ideal for mounting of mirrors
Low odour – ideal for use in areas with poor ventilation
Non-sag – can apply on vertical surfaces
Mould resistant – suitable for use in damp areas e.g. showers, bathrooms
Flexible at temperatures as low as -60°C
Versatile – adheres to a wide variety of substrates
Waterproof – suitable for external applications
Excellent UV-resistance and abrasion resistance – long lasting durable bond
Non-sag – can apply on vertical surfaces
Low shrinking on curing
Outstanding primerless adhesion to a variety of substrates
Unaffected by alcohols, dilute acids and alkalis, soap and household detergents
Excellent colour fastness – clear grades are non yellowing
Moisture curing system; cure rate is unaffected by low ambient temperatures
Resistant to mineral oil, transmission fluid, anti-freeze, petrol and alcohol
Applications
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Formulated to replace cork, felt, rubber and asbestos gaskets
Can be applied to numerous areas, such as axle covers, bearing cap seals, fuel pumps
to blocks, intake manifolds, keyway slots, oil filter housing to blocks, window gaskets
and seals, bearing plate gasket, engine base gasket, tappet covers, valve covers, water
pumps and associative housings
It is also suitable to be used in place of lamp cover gaskets, lamp housing gaskets, to
seal ignition units and cable entry points
FIPG (Formed In Place Gasketing) and CIPG (Cure In Place Gasketing) applications
Repairs in ovens
Can be used as an adhesive where an elastic gap filling bind is required
Adhesion
BOSTIK SUPER GASKET adheres to all types of alloys and metal used in engine and motor
construction
BOSTIK SUPER GASKET exhibits excellent primerless adhesion to many non-porous
materials e.g. ceramics, glass, enamel, porcelain, coated wood, painted surfaces, epoxide,
canvas, rubber, most metals (mild steel, aluminium, lead, copper, tin, galvanized iron,
brass or zinc) and some plastics (acrylics, polyester, polyacrylate, polycarbonates,
polystyrene, fiberglass, formica, and rigid PVC)
BOSTIK SUPER GASKET can be used on alkaline surfaces such as concrete, fibrous cement,
mortar, asbestos and plaster
For more information on adhesion, refer to our “Silicone Adhesion Chart” leaflet
PJ/D181/Issue 04/Sept 2010/Super Gasket
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TECHNICAL DATA SHEET
Limitations
BOSTIK SUPER GASKET should not be immersed in petrol
BOSTIK SUPER GASKET should not be used in an attempt to replace composite cylinder
head gaskets, especially where tolerances are predetermined and are critical to engine
performance
BOSTIK SUPER GASKET CANNOT be over-painted
Safety Instructions
When working with uncured BOSTIK SUPER GASKET, it is advisable to wear gloves in order
to avoid direct contact with the skin. During curing, methanol is released. Work in a
ventilated area. If BOSTIK SUPER GASKET comes in contact with skin or eyes, flush
thoroughly and immediately with water. If irritation continues, seek medical attention
Cured silicone rubber can be handled without any health risk
Keep out of reach of children!
Refer to our Material Safety Data Sheets for further toxicological information and
comprehensive handling instructions
Surface preparation
The surface coming into direct contact with the BOSTIK SUPER GASKET must be clean, dry,
free from all loose materials, dust, dirt, oil, rust and any other contaminants
Non-porous substrates such as metals, glass and plastics should be degreased with a
solvent. Plastics can be lightly abraded with emery paper
Soaps or detergents used to clean the surface must be rinsed away thoroughly with clean
water to ensure that all traces of the soaps are removed before sealing. Use back-up
material where needed (see Application Notes)
Poor surface preparation may result in the delamination of the silicone
Directions for Use
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Ensure that surfaces are prepared as above
Remove the cap from the tube and pierce film with reverse side of cap to break the
seal. Cut the tip off the nozzle to achieve the desired bead size and screw nozzle on to
the tube
Squeeze the tube and apply the silicone at a slight angle in the direction of use. After
use, remove the nozzle, wipe clear and replace the cap firmly to avoid any air from
entering the tube
Sealant skins in 25 minutes, dries to touch in 1 hour and reaches full cure after
approximately 24 hours
Use masking tape to get a clean, even sealant line and to eliminate cleaning difficulties on
porous surfaces. Be sure to remove the tape before sealant begins to skin
Smooth down after application (within 3-5 minutes) before skin formation occurs, by
using a flat or rounded tool, or even a finger, dipped in soapy water
Cleaning
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Uncured silicone can easily be removed from the hands or tools using a clean solvent
soaked cloth, e.g. turpentine or paraffin. If removing uncured silicone from clothing,
check fabric colourfastness before applying the above mentioned solvents
Sealant dries to touch in 1 hour and reaches full cure after approximately 24 hours.
Fully cured sealant can be removed by mechanical means, i.e. with a sharp knife or
chemically, with BOSTIK SILICONE STRIPPER
If the area being sealed needs to be painted, ensure that the paint has dried
COMPLETELY before sealing with BOSTIK SUPER GASKET
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Next Revision: Sept 2014
TECHNICAL DATA SHEET
Storage Stability
BOSTIK SUPER GASKET has a shelf life of at least 12 months if stored in a cool (below
25°C), dry place in it’s original moisture-tight container
If the material is kept beyond the recommended shelf life, it is not necessarily
unusable, but a check should be performed to observe whether the product is still
workable, apply-able and uncured
To maximize the shelf life of the opened cartridge, store in a cool environment after
creating an airtight environment by wiping down the tube opening and placing a piece
of plastic over it and screwing on the nozzle
Product packaging
90ml tube
Product Data
i. Uncured silicone
Black Vulcanizing Polymer
Non Slump Paste
1.10g/cm3
Appearance
Density (uncured)
Skin over time (23°C, 50% RH)
Approximately 25 minutes
Curing time (23°C, 50% RH)
Approximately 24 hours/mm
Slump NF P 85516
0.00mm
Coverage – 90ml Tube
4 metres (5mm x 5mm joint)
ii. Cured silicone
Service temperature range
Min. -60°C to Max. +260°C
Movement accommodation factor
20% - 25% when fully cured
Tensile strength
2.0 N/mm2
Ultimate elongation
250%
Shore A hardness
32
Tear strength
7.0 N/mm
The above information is only offered, as a guide to the use of this product. Furthermore, users should satisfy themselves
that it is suitable for their needs. Since we have no control over the conditions under which it is used, we cannot accept
responsibility for problems caused by the use and/or application of this product.
Head Office: +27(0)21 555 7400
Beverley Close, Montague Gardens, 7441
PO Box 37008, Chempet, 7442
www.bostik.co.za
PJ/D181/Issue 04/Sept 2010/Super Gasket
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Next Revision: Sept 2014
TECHNICAL DATA SHEET
Silicone Adhesion Chart
Primerless Ratings: Do not use; no bond; fair; good; excellent
ABS
Aluminium
Brass, Bronze
Cement, concrete
Ceramic
Copper
Correx boards
Fibreglass
Fluoro plastics
Galvanised metal (Zinc)
Glass
Iron
Lead
Marble
Nylon
Olefins, corona treated
Painted surfaces
Perspex
Prestressed polyacrylates
Plastics, general
Polycarbonate
Polyethylene
Polypropylene
Polyester
Polystyrene, expanded
Polyurethane
Printed Circuit Boards
PVC / PVF
Rubbers – butyl,
neoprene
Rubbers – SBR, Nitrile,
EPDM, Polysulphide
Silicone
Steel
Stainless Steel
Wood, untreated
Wood, varnished
Acetoxy
Bostik Home, Bath, Car,
Shower, 2550, Gasket
Red,
Alcolin Silicone, K86, 110
Fair *
Good *
Do not use
Do not use
Excellent
Do not use
Good
Excellent
Fair *
Do not use
Excellent
Do not use
Do not use
Do not use
Fair *
Good
Good
Fair *
Not recommended
Fair *
Fair *
No bond
No bond
Fair *
Good
Fair *
Do not use
Fair *
Fair *
Fair * - May discolour
some rubbers
Excellent
Do not use
Good *
Good *
Good
6 December 2004
Neutral Alkoxy
Bostik Build, Bostik
Mirror,
Alcolin 205, 400
Neutral Oxime
Bostik
Gasket Maker
Good
Fair *
Excellent
Good *
Excellent
Excellent
Good
Excellent
Good
Good
Excellent
Good
Good *
Good – May cause
staining
Fair *
Good
Good
Good
Not recommended
Good
Good
No bond
No bond
Good
Good
Good
Excellent
Good
Good
Good
Good *
Good
Good *
Excellent
Good
Good
Excellent
Excellent
Good
Excellent
Good
Good
Good – May cause
staining
Good
Good
Good
Good *
Not recommended
Good *
Good *
No bond
No bond
Good
Excellent
Excellent
Not advisable
Good *
Good *
Good
Good
Excellent
Good
Good
Good
Good
Excellent
Good
Excellent
Good
Good
Note : Good surface preparation is essential
* Adhesion can be improved by applying suitable primers
PJ/D181/Issue 04/Sept 2010/Super Gasket
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Next Revision: Sept 2014