Need a Quotation !
NUFLEX 302 GENERAL PURPOSE SILICONE SEALANT
NuFlex 302 General Purpose Silicone Sealant is a 100% medium
modulus, one component caulking material with a consistency similar
to that of toothpaste. NuFlex 302 cures to form a tough, rubbery solid
upon exposure to moisture in the air. Because it does not flow due to
its own weight, the ceiling can be applied overhead or on sidewall
joints and surfaces without sagging, slumping or running off. It
adheres to clean metal, glass, most types of wood, silicone resin,
vulcanized silicone rubber, ceramic, natural and synthetic fiber,
painted surfaces and many plastics.
NuFlex 302 has good resistance to weathering, vibration, moisture,
ozone and extreme temperatures. It may be applied in sub-zero
weather without loss of extrusion or physical property characteristics
and is effective to -46° C (-50° F).
FEATURES AND TYPICAL USES:
NuFlex 302 can be used for the following: 1) Caulking and sealing
around bathtubs, shower stalls, bathroom vanities, kitchen counters,
sinks, windows and doors. 2) To draftstop and waterproof
eavestroughs and soffits. 3) For replacing ceramic tiles and making
new gaskets for dishwasher doors, skid and mar proofing vases,
ashtrays and picture frames. 4) For sealing windshields in cars, vans
and boats. 5) For repairing or installing body-side moulding. 6) For
making gaskets to replace costly paper gaskets, for timing chain and
valve covers and for water pump or thermostat housings... any
application that requires a permanently flexible waterproof seal that
will withstand moisture, heat and vibration.
Caution : NuFlex 302 general-purpose silicone sealer can corrode or may not adhere to copper, brass (and coppercontaining
alloys), magnesium, zinc and galvanized metals (and other zinc-containing alloys).
SURFACE PREPARATION AND APPLICATION:
Applying: NuFlex 302 is applied ready to use. It flows readily from its container under pressure. The paste-like
consistency makes it easy to work with. A spatula, wooden paddle or wetted finger can be used to tool the
Cure Time: Cure time is affected by relative humidity, degree of confinement and cross-sectional thickness of
the sealant. Sections of up to 3.2 mm (1/8”) thick become rubbery solids in about 24 hours at room temperature
and 50% relative humidity.
In applications where NuFlex 302 may be partially or totally confined during cure, the time required for proper
cure is generally lengthened by the degree of confinement. Every application involving confinement during
cure should be thoroughly tested before production commences.
Curing time increases with the thickness of the sealant. A 12.7 mm (1/2”) cross section for example, may require
3 or 4 days for complete cure . However, the cure will have penetrated the outer 3.2 mm (1/8”) in about 24 hours.
Adhered to glass, metal or most woods. NuFlex 302 has a typical peel strength of 20 lbs. per inch, after 72
hours at room temperature.
Bonding: 1) Thoroughly clean and degrease metal and plastic surfaces. Then rinse all surfaces, except plastic,
with acetone. Rubber surfaces should be roughened with sandpaper, then wiped with acetone. Follow the
precautions given on the solvent container. 2) Apply NuFlex 302 to the prepared surfaces in a uniform thickness
. Best adhesion is obtained with a 0.4 - 0.8mm (15 -30 mil) glue line. If the adhesive is used between two
surfaces, put the second surfaced in place, using enough pressure to displace the air but not the adhesive. 3)
Let the unit stand undisturbed at room temperature to cure.
Sealing: The use of NuFlex 302 in sealing application follows approximately the same step-by-step procedures
as outlined for bonding application.
Use in well ventilated areas and avoid breathing vapors. On contact, uncured sealant irritates eyes. Flush eyes
with lukewarm water. Call physician. Avoid skin contact and do not ingest. Keep out of reach of children. For
complete safety information consult Material Safety Data Sheet. Sealant releases acetic acid (vinegar-like
odour) during cure.
NuFlex 302 meets the following specifications: (1) CAN/CGSB-19.13-M87, Class MG-2-25 - A - L, (2) ASTM C920, Type S,
Grade NS, Class 25, use NT, G, A, O. U.S. Fed Specs TT-S-001543A and TT-S-00230C Type 2. Certified by NSF. Agricultural
Canada Approved. NuFlex 302 after fully cured and washed meets the requirements of FDA Regulation No. 21 CFR 177.2600
subject to end use. Note: Clear, Black, White and Aluminum. NuFlex 302 meets USDA regulation for use in federally
inspected meat and poultry plants for Clear, Black, White and Aluminum colours. NuFlex 302 General-Purpose is recognized
by Underwriters Laboratories for service to 150°C (302°F) where elongation is not essential. UL plastics component QMFZ2
file no. E 196754.
PACKAGING AND COLOURS:
NuFlex 302 General Purpose is available in a variety of sizes 80 ml (2.7 U.S. fl oz), 300 ml (10.1 U.S. fl oz), 850 ml (28.6 U.S. fl
oz) all-plastic caulking cartridges with nozzle which fit manual or air operated caulking guns, (12 cartridges to a case). It is
also available in 10 Litre (2.6 U.S. Gallon) pails, 17 Litre (4.5 U.S. gallon) pails and 196 Litre (50 U.S. gallon) drums. NuFlex
302 is available in a wide variety of colours including clear, white, translucent, black, brown, medium brown, bronze, almond, aluminum and g re y . Special colours are available in orders of minimum quantities upon request. For sealant
coverage or yields please see the “Coverage Chart” found in the “Application tip” section of the Nuco technical binder.
SHELF-LIFE AND STORAGE:
Shelf-life is 12 months from date of shipment from our plant when stored in clean, dry area with temperature between 40°F
to 90°F (4°C to 32°C). For best results, keep the sealant in tightly closed containers when not in use.
NUCO Inc., warrants only that its product will meet its specifications. NUCO shall in no event be liable for incidental or consequential
damage. NUCO's liability, expressed or implied is limited to the stated selling price of any goods found to be defective.
These values are not intended for use in preparing specifications. Spec Writers, please contact NUCO Inc. before writing
specifications if any further information is required.
Specific Gravity 1.04
Extrusion Rate (3.2 mm (1/8”) orifice, 90 psi air pressure) g/minute 400
Flow Rate (sag or slump) Nil
Tack-Free Time at 25°C (77°F) and 50% R.H. - in minutes 10 - 20
Cure Time at 25°C (77°F) at 50% R.H. (3.2 mm (1/8”) Thickness) in hours 24
As Cured - Physical
ASTM C 661 - Durometer HArdness Shore A, points 25
ASTM D 412 Die C - Tensile Strength, MPa (psi) 2.24 (325)
ASTM D 42 Die C - Elongation, percent 550
ASTM D 746 - Brittle point, °C (°F) -62 (-80)
ASTM D 2137 A - Volume Coefficient of Thermal Expansion
0° to 100°C (32°F to 212°F) 9.3 x 10-4
Thermal Conductivity(cal/(cm)(°C)(sec) 0.45 x 10-3
As cured – Electrical
ASTM D 257 - Volume Resistivity (OHM – cm) 1.5 x 10 15
ASTM D 149 - Dielectric Strength – kV/mm(V/mil) 21.7(550)
ASTM D 150 - Dielectric Constant at 60 Hz, 100Hz and 100kHz 2.8
ASTM D 150 - Dissipation Factor at 60 Hz, 100Hz and 100kHz 0.0015
Fully cured NuFlex 302 can be used for extended periods at temperatures up to 204° C (400° F) and for shorter periods as
high as 232° C (450° F).
The information and data contained herein is BASED ON INFORMATION WE BELIEVE TO BE RELIABLE. Please read all
statements, recommendations or suggestions herein in conjunction with our CONDITIONS of SALE which apply to all goods
supplied by us. We assume no responsibility for the use of these statements, recommendations or suggestions, nor do we
intend them as recommendation for any use which would infringe any patent or copyright
Self Seal Products
© Copyright 2012 All rights reserved www.globalfirestopservices.com
Designed and Maintained by: John Smillie/Lasting Impressions