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NuFlex 319 Glass and Metal Building Sealant is a one-part, high modulus, non–corrosive moisture curing 100% silicone sealant. NuFlex 319 has superior adhesion to most construction materials without the need for a primer. NuFlex 319 cures to form a flexible, watertight bond to glass, plastic, metal, concrete and masonry, factory and field installed metal building systems.

Conventional glazing Weather seal around doors and windows Sealing around metal building flashings, eavestroughs and fittings Factory made windows as the primary seal/bedding compound All joints and glazing pockets should be free of dirt, grease, oil, moisture and old sealants or glazing compounds. Primeless non-corrosive, no offensive odours all season gunnability – from –37°C to 60°C (-38° to 140°F) durable – unaffected by sunlight, rain, freeze/thaw conditions, ozone or air-borne chemicals and long Life – cured sealant remains permanently flexible and will not shrink, crack, dry out or become brittle.

Metal, glass and plastic surfaces should be cleaned with an oil-free solvent and should be wiped dry. Soap and water are not acceptable.
Priming: When applied to normal building substrates, NuFlex 319 requires no priming.
Masking: After pre-work is completed, areas where sealant is not desired can be masked off with tape. The tape should not come in contact with cleaned areas where sealant is to be applied. Tooling, if required should be done immediately after sealant is applied and in one continuous motion. Masking tape should be removed immediately after tooling is completed. NuFlex 319 is not recommended for use below grade or in joints where abrasion such as foot or wheel traffic is possible or on surfaces that are to be painted. The paint film will not adhere to the sealant and may crack or peel. Glass-to-Glass butt joints should be tested for appearance prior to production.
Joint Design: Joint depths should not exceed 12.7 mm(1/2”) and be no thinner that 3.2 mm(1/8”). A thin bead of NuFlex 319 will allow more joint movement than a thick bead, For perimeter sealing or expansion joint design, the ratio of joint width to sealant should be about 2:1. Polyurethane or polyethylene backer rod is recommended for deep joints and polyethylene tape for shallow joints. These materials act as bond breakers and allow the sealant to stretch freely with joint movement. Install back-up material, setting blacks, spacer shims and tapes as specified. Apply NuFlex 319 in a continuous bead to fill joint. Tool with enough pressure to push the sealant down into and against the sides of the joint. Tool the sealant applied at the sill on a slight upward angle so that moisture will not pool. Excess sealant should be cleaned from glass, metal and plastic with commercial solvent such as xylol, toluol or methylethyl ketone before sealant cures. Sealant that comes in contact with porous surfaces should be allowed to cure and then be removed with abrasion or other mechanical means.

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. Consult Material Safety Data Sheet. Combustible, keep away from heat and open flame. Keep out of reach of children.

NuFlex 319 meets areas or exceeds the following specs: U.S. Fed. Spec. TT-S-001543A (COM-NBS) Class A and TT-S-00230CC (C)M-NBS) Class A. ASTM Specification: C-920, Type S, Grade NS, Class 25 Use NT, M, G, A. O; CAN/CGSB-19. 13-M87, Class MCG-2-25-A-L.

NuFlex 319 Glazing Sealant 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 200 Litre (52 U.S. gallon) drums. NuFlex 319 Glazing Sealant is available in a wide variety of colours including clear, white, bronze 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).

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 good found to de 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 (3.2mm (1/8”) orifice
at 0.62 MPa (90 psi air pressure) 440 / minute
Tack Free Time at 25°C (77°F), 50% Relative Humidity 25 minutes
Tooling Time 4 – 8 minutes
Cure Time at 25°C (77°F), 50% Relative Humidity 24 hours
As cured – after 7 days at 25°C (77°F) and 50% Relative Humidity
Durometer Hardness - ASTM C661 – Shore A 30
100% Modulus – ASTM D412, Die 0.52MPa (75 psi)
Elongation at Break – ASTM D412, Die 540%
Tensile Strength – ASTM D412, Die 1.9 MPa (275 psi)
Tear Strength – ASTM D624 5.25kN/m (30 ppi)
Peel Adhesion Strength – ASTM C794S 5.25 kN/m (30 ppi)
Joint Movement Capability +/- 25%
Service Temperature Range – ASTM C 1299 -62°C to 204°C (-80° to 400°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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