Dow Corning

785 Silicone sealant

DESCRIPTION TYPICAL PHYSICAL PROPERTIES Back-up material

Dow Corning 785 is a one- These values are intended for use in abe duracord closed cell polyethylene
component, acetoxy flexible silicone preparing specifications. backer rod is recommended as a back-
sealant especially designed for the Cure type Acetoxy up material.
sealing of sanitary and kitchen
applications. Slump Nil
Masking
Working time 5-10 min.
USES Tack-free time 20 min. Areas adjacent to the joints should be
masked with tape to prevent
For sealing around sanitary fittings to Staining None contamination of substrates and
give a water resistant hygienic seal: ensure a neat sealant line. Masking
Movement capability in + 25%
• Kitchen fittings, including baths, service (% joint width after tape should be removed immediately
sinks, urinals and ceramic tile 14 days cure) after tooling.
joints.
Recovery 100% MIXING
FEATURES & BENEFITS Cure time 24 hours
No mixing required. Use straight from
Hardness (Shore A) 25 cartridge.
• 100% silicone rubber.
• Excellent weathering properties. Tensile strength (ISO 8339) 2,3 MPa Finishing
• Easy to apply, one-component Elongation at break 530%
sealant. (ISO 8339) The joint should be ‘tooled’ within five
• Contains a fungicide to prevent minutes of application to ensure good
mould growth. Specific gravity 1,03
contact between the sealant and the
• No maintenance required. Colours Clear & substrate. Tooling of the sealant also
• High gloss finish. white gives a smooth, professional finish.
• Available in a wide colour range
to match most popular sanitary COVERAGE
furniture. SURFACE PREPARATION
• Fast cure. Estimating sealant requirements
• Excellent adhesion to non-porous This table is a guide only Linear metres per 310 ml cartridge
surfaces. Recom. Width (mm) 6 9 12 15 18 25
Surface Constr.
• Non-slump. Substrate
cleaning
degreas-
Primer Depth
6 8,6 5,7 3,4 3,4 2,9 2,1
ing (mm)
• Joint movement capability ± 25% 9 - 3,8 2,9 2,3 1,9 1,4
of original joint width. Stainless Acetone or
Degrease 1 200 OS
steel MEK 12 - - 2,2 1,7 1,4 1,0

Methylated
SURFACE PREPARATION Acrylic Degrease
spirits
1 200 OS
Joint design
Acetone or None
Joint preparation: Porcelain Degrease
MEK required
When designing joints using Dow
Vitreous Acetone or None Corning 785, the minimum width
Cleaning enamel
Degrease
MEK required
should be 6 mm. For joints between
Glazed
Acetone or None 6 mm - 12 mm wide, a seal depth of
Ensure that all surfaces are clean, dry, ceramic Degrease
tiles
MEK required 6 mm is required. For joints above
sound and grease free.
12 mm wide, a width to depth ratio of
Clean with methylated spirits and dry
2:1 should be used, up to a maximum
thoroughly with a clean, lint-free cloth heat, sparks and open flames. depth of 12 mm. In situations where
before application of sealant. Observe and follow all precautions fillet joints are needed, a minimum of
listed on solvent container label. 6 mm sealant bite to each substrate is
Note: When using any solvent always
recommended.
provide adequate ventilation. Avoid
Revision 9203

Karachi: Room No.1, Mezzanine Floor, Al-Hayat Chambers, A-7, Block-7/8, K.C.H.S. Tel: +92 21 4535898-99, Fax: +92 21 4558071
Lahore: 25-A, FCC, Syed Maratib Ali Road, Gulberg 4, Tel: +92 42 5763360 Fax: +92 42 5875384
APPLICATION HANDLING & STORAGE indirectly arising from the use of abe
products, whether or not in accordance
Cut the tip of nozzle at the angle This product has a shelf life of with any advice, specification,
required. Apply Dow Corning 785 12 months if kept in a dry cool place in recommendation, or information given
from a caulking gun using sufficient the original packaging. In more by the company.
pressure to ensure adequate contact extreme conditions this period might
with sides of joint. The surface of the be shortened. FURTHER INFORMATION
joint may be smoothed over with a little
liquid soap and water to ensure good LIMITATIONS Where other products are to be used
contact between the sealant and in conjunction with this material, the
substrate. Dow Corning 785 should not be used relevant technical data sheets should
on substrates that bleed oils, be consulted to determine total
CLEANING plasticizers or solvents. It is not requirements. abe Construction
recommended for use with certain Chemicals has a wealth of technical
Excess sealant should be cleaned off plastics, particularly flexible plasticised and practical experience built up over
tools and non-porous surfaces whilst in types. Dow Corning 785 is not years in the company’s pursuit of
an uncured state. recommended for structural glazing or excellence in building and construction
Sealant adhering to porous surfaces insulated glazing applications. technology.
should be left until just cured and then Dow Corning 785 should not be
removed by abrasion or other applied to surfaces in direct contact
mechanical means. Care must be with food as it contains a fungicide. It
taken not to discolour plastic surfaces. should not be used for aquariums.
Consult abe Technical Services
Tools, brushes and mixing equipment Department for further advice in
should be cleaned immediately after specific applications.
use and before material has set with
abe super brush cleaner followed by TEST COMPLIANCE
washing with soap and water.
Dow Corning 785 meets or exceeds
the specifications of:
PROTECTION ON COMPLETION • BS (British Standard) 5889 Type B.
• ISO 9047 Class 20.
Dow Corning 785 is UV and mould • The fungicide performance is
resistant and is suitable for internal tested according the ISO 846.2.
and external use. No protection is
required.
HEALTH & SAFETY
TEMPERATURE AND RELATIVE Dow Corning 785 silicone sealant
HUMIDITY will release acetic acid when curing.
Application temperature range: Dow Corning 785 is acetoxy and
o o
+5 C - 35 C should not be allowed contact with skin
and eyes. Avoid inhalation of fumes.
MODEL SPECIFICATION The use of gloves, eye protection and
masks is advised. Splashes into eyes
One-component acetoxy silicone for should be washed immediately with
sealing sanitary and kitchen fittings. plenty of clean water and medical
Contains a fungicide to resist mould advice sought.
growth.
Cured Dow Corning 785 is inert and
The sealant shall be Dow Corning harmless.
785, a one component acetoxy cured
silicone sealant applied in accordance IMPORTANT NOTE
with the distributors recommendations,
abe Construction Chemicals (Pty) This data sheet is issued as a guide to
Ltd. The sealant shall meet the the use of the product(s) concerned.
requirements of BS 5889 type B, ISO Whilst abe Construction Chemicals
9047 class 20 and ISO 846.2. endeavours to ensure that any advice,
recommendation, specification or
PACKAGING information is accurate and correct, the
company cannot - because abe has no
Dow Corning 785 is supplied in 310 direct or continuous control over where
ml cartridge packed in boxes of 24. and how abe products are applied -
accept any liability either directly or

Revision 9203

Karachi: Room No.1, Mezzanine Floor, Al-Hayat Chambers, A-7, Block-7/8, K.C.H.S. Tel: +92 21 4535898-99, Fax: +92 21 4558071
Lahore: 25-A, FCC, Syed Maratib Ali Road, Gulberg 4, Tel: +92 42 5763360 Fax: +92 42 5875384