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Techinical Information
NuFlex 302 Bath & Kitchen Silicone Sealant

NuFlex 302 Bath & Kitchen 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).

NuFlex 302 can be used for the following: 1) Caulking and sealing around bathtubs, shower stalls, bathroom vanities, kitchen counters and sinks. 2) For replacing ceramic tiles and making new gaskets for dishwasher doors.
Caution : NuFlex 302 Bath & Kitchen silicone sealer can corrode or may not adhere to copper, brass (and copper-containing alloys), magnesium, zinc and galvanized metals (and other zinc-containing alloys).

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 surface. 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 re q u i re 3 or 4 days for complete cure . However, the cure will have penetrated the outer 3.2 mm (1/8”) in about 24 hours. Adheres 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 surface 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 l u k e w a rm 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 Bath & Kitchen 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 Bath & Kitchen is available in a variety of sizes 300 ml (10.1 U.S. fl oz), 850 ml (28.6 U.S. fl oz) allplastic 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) pails. NuFlex 302 Kitchen & Bath is available in a wide variety of colours including clear, white, translucent, beige, bone, almond, forest green and grey. 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 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.

As Supplied
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 218° C (425° 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.

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