ALUMINUM

MOISTURE CURE URETHANE PRIMER

Suggested Uses

• Recommended for any steel structures exposed to heavy duty service in corrosive environments
• Super structures
• Machinery

Technical Data

Coating type	Single component moisture cure urethane
Colour	aluminum grey
Packaging	3.78 L (1 US gallon) 11.34 L (3 gallons)
Mixing Ratio	Single component
Gloss	Semi-gloss
Flashpoint (ASTM D93)	26º C (80º F)
Thinner	GS UC 500S
Pot life	up to 6 hours
Shelf life	1 year
Density (ASTM D 1475)	1.10 kg / L +/- 0.05
Weight	9.15 +/- 0.11 lb / US gal.
Volatile organic compound (VOC)	3.3 lb / US gal. (400 g/L)

Temperature resistance	100º C (212º F) in continuous service
Solids (ASTM D1644)
By weight	65 +/- 2%
By volume	55 +/- 2%
Theoretical spreading rate	21 sq.m / l at 25 microns dry 860 sq.ft. / US gal at 1 mil
Recommended film thickness	75-100 microns dry (3.0 - 4.0 dry mils) For severe conditions: 125-150 microns dry (5.0-6.0 dry mils)
Application methods	Brush, roller, conventional air spray, airless and HVLP (airless preferred)

Surface Preparation

The surface preparation recommended for INTER-SHIELD™ MC 46704 is to include removal of all oil, grease, dirt, dust, mill scale, rust, paint, oxide, corrosion product and other foreign matters. This can be accomplished with hydroblasting, grit sweeping and with a variety of mechanical descaling tools. The minimum standard for steel is Steel Structures Painting Council Standard SSPC-SP-2 or SSPC-SP-3. The recommended surface preparation is SSPC-SP6.

Mixing and Thinning

INTER-SHIELD™ MC 46704 is a one component product supplied in 3 US gallons or 1 US gallon containers. The entire content of the container must be well mixed before application

Thinning is not normally required or desired; however, at lower temperatures, small amounts (10% or less) of Glass Shield GS UC 500S thinner can be added depending on local VOC and air quality regulations. Any solvent addition should be made after the one component product is thoroughly stirred.

The pot life or the "working pot" is up to 6 hours. After the paint is stirred and poured, immediately seal the original can. Higher temperatures or humidity will shorten the pot life. Do not apply over water or frozen surfaces.

Application Conditions

Industry standards are for the substrate temperatures to be above 10º C of the dew point. Condensation due to substrate temperatures below the dew point can cause flash rusting on prepared steel and interfere with proper adhesion to the substrate. Special application techniques may be required above or below normal application conditions.

Condition	Material	Surface	Ambient	Humidity
Normal	60 - 85º F (16 - 29º C)	65 - 85º F (18 - 29º C)	p>60 - 90º F (16 - 32º C)	0 - 65%
Minimum	50º F (10º C)	23º F (5º C)	23º F (5º C)	0%
Maximum	90º F (32º C)	100º F (35.5º C)	100º F (35.5º C)	85%

DISCLAIMER: All information is given in good faith. Since conditions of use are beyond the manufacturer's controls, all information contained herein is without warranty, implied or otherwise. All technical data and specifications are subject to change. Please consult with your Glass Shield representative for more detailed coating recommendations. Revised 08-01-2007

Packaging, Handling & Storage

Shipping weight (approximate)	1 gallon: 15.3 lb (7kg)	5 gallons: 76.5 lb (35 kg)
Storage (general)	Store indoors
Storage temperature & humidity	40-100º F (4-43º C) 0-100% relative humidity
Shelf life	Min. 1 year at 75º F (24º C)

Typical Sequence (First class finish)

Not recommended for

• Non ferrous substrates
• Constant immersion

Performance Information

Specific Test	ASTM	Result
Impact resistance: direct	D2794	76 lbs
Sag (ready to spray)	D4400	25 mils / 22 sec. Zahn #2
Viscosity	D4212	28 sec. Zahn #2
Intercoat adhesion	D2197 / 3359	4B
Elcometer (pull test)	D4541	>800 lbs with polyurethane 2800 series

Salt Spray

Specific Test	ASTM	Result
System MC-4390 + polyurethane 2800*	B117	5000 hours

*All results based on Glass-Guard 2800002 white

Chemical Resistance (spot tests)

Specific Test	ASTM	Result
Solvent	D1308	Very good
Acids	D1308	Very good
Alkali	D1308	Very good
Oil / grease	D1308	Very good
Detergent	D1308	Excellent

Application

INTER-SHIELD™ MC 46704 can be applied by brush, roller or spray. De Vilbiss or equilavent equipment should be used. Airless spray: heavy duty 30:1 airless pump with tip size 0.017-0.021 in. at 3000 psi pressure with 3/8 in fluid hose maximum 50 ft lenght. Spray gun: similar to De Vilbiss 510, fluid tip 0.55-0.73 in. at 30-60 psi pressure. For HVLP applications, please refer and comply with equipment supplier's recommendations.

Airless & Air Spray

Manufacturer	Graco
Pump	30 : 1
Fluid hose	3/8" x 100' max
Tip size	*
PSI	2400 PSI min.

Refer to Kremlin chart for specific uses or consult Glass Shield technical services

Manufacturer	Devilbiss	SATA
Spray gun	HET	K3 RP
Fluid tip	1.4-1.6 ff	1.4-1.6
Air cap	#410 / 414
Fluid line	3/8"	3/8"
Pressure pot	15 - 25 psi	40 psi
Atomizing air	50 - 60 psi	36 psi

Curing Schedule

Ventilate the substrate for 2 hours after application. Curing times are based on a 2.0-3.0 mil (50-75 micron) dry film thickness. Higher film thickness, insufficient ventilation or cooler temperatures will require longer cure times and could result in solvent entrapment and premature failure of the film. Maximum recoat time is 5 days without special surface preparation. If you desire a longer recoat window, an additive can be added. Consult a Glass Shield representative for further information. If the maximum recoat time has been exceeded, the surface must be sanded or prepared with a brush off blast SSPCSP- 7 prior to the application of additional coats. INTER-SHIELD™ MC 46704 applied below 40ºF (4ºC) may temporarily soften for several hours, after temperatures rise to 60ºF (16º C). This is a normal condition and will not influence performance. Curing times given at 23ºC (73ºF) and 40% relative humidity. Higher or lower temperatures will affect drying times.

Dry to touch	3-4 hours
To recoat	3-6 hours (Max. 12 hours before sanding)
Hard	8-12 hours
Full cure	7 days