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Technical Specifications

TGIC Polyester Powder Coating Urethane Powder Coating Hybrid Powder Coating
Epoxy Powder Coating Uses    
Technical Solution for Application Problems Technical Solution for Film Property Problems

Powder Technology
TGIC Polyester Powder Coating Uses
TGIC Polyester powder coatings feature characteristics of long-term exterior durability, high performance mechanical properties and over bake resistance.

Typical applications include:
Agricultural Equipment
Appliances
Construction Equipment
Electrical Enclosures
Lawn and Garden Equipment
Lawn Furniture
Recreational Equipment
Under-hood Automotive
Wheels and Rims

Technical Data for TGIC Polyester Powder Coatings
TGIC Polyester powder coatings offer excellent application and performance characteristics. Long term exterior durability, high performance mechanical properties and over bake resistance are common characteristics of these premium TGIC Polyester coatings.

Cured Film Properties:
Specific Gravity 1.2 to 1.8(Depending on color)
Adhesion GT=0/100
Gloss 1 - 99 %@60°
Pencil Hardness H-4H
Impact 40 kg.cms to 120 kg.cms.
Flexibility/Bending 5 mm
Salt Spray 500+ hours

Storage and Handling
KRIPTON powder coatings should be stored at normal room temperatures and humidity. Shelf life will be minimum 6 months. Always rotate inventories to ensure trouble-free powder application. Always protect virgin and reclaimed powder from excessive heat and humidity.

Industrial Hygiene
Powder handling should always be done in conjunction with proper dust collection and personal protective equipment.

Technical Data for Urethane Powder Coatings
Urethane Powder Coating Uses
Urethane powder coatings feature characteristics of excellent gloss retention and long-term resistance to humidity and corrosion in thin film applications.

Typical applications include:
Agricultural Equipment
Air Conditioners
Construction Equipment
Electrical Enclosures
Lawn and Garden Equipment
Lawn Furniture
Light Fixtures
Office Furniture
Recreational Equipment
Under-hood Automotive
Wheels and Rims

Cured Film Properties (properties are typical):
Specific Gravity 1.2 to 1.8(Depending on color)
Adhesion 0/100
Gloss 40-90
Pencil Hardness H-4H
Impact 40 kg.cms to 120 kg.cms.
Flexibility 5 mm - No fracturing
Salt Spray 500+ hours

Storage and Handling
KRIPTON powder coatings should be stored at normal room temperatures and humidity. Shelf life will be minimum 6 months. Always rotate inventories to ensure trouble-free powder application. Always protect virgin and reclaimed powder from excessive heat and humidity.

Industrial Hygiene
Powder handling should always be done in conjunction with proper dust collection and personal protective equipment.

Hybrid Powder Coating Uses
Hybrid powder coatings attribute good adhesion and resistance properties, offering an cost-effective alternative to epoxies. Hybrid powders will have limited exposure due to the epoxy component, whereas slightly improved over bake resistance to yellowing is found in the polyester part.

Typical applications include:
Business Machines
Electrical Enclosures
Fire Extinguishers
Garden Tools
Hospital Equipment
Light Fixtures
Office Furniture
Oil Filters
Power Tools
Shelving
Tool Boxes
Under-hood Automotive

Technical Data for Hybrid Powder Coatings
Cured Film Properties (properties are typical):
Specific Gravity 1.2 to 1.8(Depending on color)
Adhesion 0/100
Gloss 05-99@60°
Pencil Hardness H-4H
Impact 40 kg.cms to 120 kg.cms.
Flexibility/Bending 5 mm - No fracturing
Salt Spray 500+ hours

Storage and Handling:
KRIPTON powder coatings should be stored at normal room temperatures and humidity. Shelf life will be minimum 6 months. Always rotate inventories to ensure trouble-free powder application. Always protect virgin and reclaimed powder from excessive heat and humidity.

Industrial Hygiene:
Powder handling should always be done in conjunction with proper dust collection and personal protective equipment.

Epoxy Powder Coating Uses
Epoxy powder coatings exhibit inherent toughness, corrosion resistance, chemical resistance, flexibility, adhesion and abrasion resistance.
Epoxy powder coatings should not be used for exterior applications or where exposure to ultraviolet radiance will cause chalking.

Typical applications include:
Appliances
Business Machines
Electrical Enclosures
Hospital Equipment
Office Furniture
Oil Filters
Power Tools

Cured Film Properties (properties are typical):
Specific Gravity 1.2 to 1.8(Depending on color)
Adhesion 0/100
Gloss 05-99@60°
Pencil Hardness H-4H
Impact 40 kg.cms to 120 kg.cms.
Flexibility/Bending 5 mm - No fracturing
Salt Spray 1,000 + hours

Storage and Handling:
KRIPTON powder coatings should be stored at normal room temperatures and humidity. Shelf life will be minimum 6 months. Always rotate inventories to ensure trouble-free powder application. Always protect virgin and reclaimed powder from excessive heat and humidity.

Industrial Hygiene:
Powder handling should always be done in conjunction with proper dust collection and personal protective equipment.

Technical Information

Technical Solution for Application Problems
Poor Penetration into Recessed Areas (Faraday Cage Effect)
The Faraday Cage Effect occurs when surfaces closer to the gun attract the powder before it can penetrate into corners and recessed areas.
Turn voltage settings down.
Increase or decrease the powder delivery air setting.
Check your ground. Hooks with heavy coating build up will become insulated from the part.
Adjust powder spray pattern with different nozzles.
Increase the powder feed velocity to penetrate the recessed area.
Adjust gun placement, so powder cloud has more direct access to area.
"High Fluidity" powders provide better penetration.

Inadequate Film Thickness
Increase voltage setting.
Adjust gun placement closer to the part and try different nozzles.
Adjust part density (racking) so that powder can be attracted equally to each part.
Excessive air velocity may be blowing powder past the part.
Poor grounding. Check your hooks.
Excessive humidity may limit the charge on the powder particles.
Powder may be too fine. Always maintain a consistent blend of virgin and recycled powder. Contact your KRIPTON Technical Service Representative for a particle size analysis.
Some powder technologies charge better or are meant to be applied as thin films. Contact your KRIPTON Technical Service Representative.

Back Ionization
Back ionization occurs when powder layers start being repelled from the part during application.
Turn voltage settings down.
Excessive powder build up can cause back ionization. Lower powder feed rates and adjusts gun distances.
Check grounding.
Having gun too close to the part.

Poor Fluidization in Hopper
Check your fluidizing membrane for plugged pores. Can be caused by moisture or oil in the air supply.
Increase air pressure to fluidizer.
Check for packed powder by stirring manually with a paddle or air.

Powder Blowing Out of Hopper
Lower air pressure in fluidizing hopper.
Powder may be too fine. Consult KRIPTON Technical Service Representative for a particle size analysis.
Check hopper for proper venting.

Geysering
Geysering is caused by air blowing holes through the surface of the fluidized powder.
Lower air pressure to the fluidizer.
Add more powder. Hopper should be about 3⁄4 full when fluidizing.
Check for plugged pores or other obstructions in membrane.
Powder may be packed or moist. Check air supply for contaminants.

Impact Fusion
Impact Fusion is the hard build up of powder particles that occur in hoses, tubes and nozzles. Clean and replace tubes, hoses, venturi pumps and nozzles on a regular basis.
Powder may be too fine. Reduce your reclaim.
Excessive air pressures and powder feed rates will increase the amount of impact fusion.
Check air supply for contaminants.

Surging or Inconsistent Powder Flow
Increase air pressure and/or volume of air.
Check powder hoses for kinks or obstructions. Keep hose length to a minimum. May need to replace powder hose with a smaller inside diameter hose.
Clean all tubes, hoses and guns of impact fusion build up.
Check powder delivery and air pressure settings.
Check hopper for powder level and fluidization.
Check air supply for contaminants.
Excessive temperature and humidity in application area can cause application problems.
Check for sintering or clumping in powder.

Poor Spray Patterns or Powder Feed
Replace worn feed tubes, orifices, and deflectors in spray guns.
Clean impact fusion from areas of accumulation.
Increase powder feed (see notes in "Inconsistent Flow" section)
Choose correct nozzle for part configuration.

Powder Drift From Spray Booth
Clean or replace filter cartridges and final filters.
Check pulse air pressure and for contaminants in air supply.
Excessive drafts or pressure from outside the spray area causing turbulence.
Using excessive amounts of compressed air during clean up.
Insufficient air volume or velocity in recovery/reclaim.
Excessive amount of fines.
If guns are added to a booth or flows are run at their maximum it may exceed the filter surface capacity and lead to powder migration out of the booth. Decrease flow rates.

Spitting and Dry Spray of Metallics
Spitting is caused by particles collecting on the diffuser and electrode.
Periodically clean the electrode with air and adjust KV’s and powder delivery.
To reduce dry spray, adjust KV’s and lower delivery volume and powder velocity.
Control film thicknesses for more consistent color.
Check KV Output at the gun.

Technical Solution for Film Property Problems
Excessive Orange Peel
Adjust film thickness to recommended range.
Lower the voltage settings on the equipment.
Some powder coatings are formulated and manufactured to tighter, more controlled particle size distribution allowing for a smoother film.

Color Contamination
Clean feed and spray systems completely before color changes (cross contamination).
Dedicated powder hoses (and feed hoppers) can reduce the chance of contamination.

Off Color Film
Examine application procedures to determine if variations in film thickness are causing the problem.
Evaluate time at peak metal temperature, to determine if the parts have been over cured.
Check oven exhaust.

High Gloss
When applying a semi-gloss or flat coating and it appears that the gloss is too high after coming out of the oven, check oven settings and part temperatures. This is usually an indication of under cured powder.

Low Gloss
Check oven and part temperatures to determine if the part has been over cured.
Always make sure powder coatings are compatible before mixing.

Variations in Film Thickness
Check application patterns and gun set-ups.
Could be caused by surges in the powder flow
Turbulence in the booth air flow.

Pinholing/Outgassing
Usually caused by air or moisture being trapped in porous metal or castings.
Pre-heat parts before applying powder, or bake at a slower rate.
Use powder coatings that are formulated to be more forgiving for out gassing.

Edge Pull, Craters
Poor surface preparation can cause voids and craters in a coating.
Excessive phosphate residues on edges can create edge pull.
Check dry-off oven for residual moisture on parts.
Extremely smooth powder coatings may exhibit more edge pull due to the flow of the coating.
Increase voltage settings for more edge coverage.

Poor Hardness and Abrasion Resistance
Always know part temperatures and times to avoid under curing the coating. Either increase the oven temperature or extend the time in the oven.
See "Determining Cure through the Solvent Rub Test. ( “For Epoxy powders use MEK and for Polyester/Hybrids/Polyurethanes use a mixture of 10%MEK+90%XYLENE.)

Poor Corrosion Resistance
Check your pretreatment system for cleaning effectiveness. Evaluate phosphate coating weights along with total dissolved solids levels in rinse tanks.
Evaluate total film thickness to determine most effective level for the end environment.
Always know peak metal temperatures and total time at that temperature to avoid under curing the coating.

Lack of Flexibility and Adhesion
Usually caused by under curing.
Check pretreatment system for cleaning effectiveness. Evaluate phosphate coating weights along with total dissolved solids level in rinse tank.
Check for excessive total film thickness.

Color Shift in Metallics
Changes in gun to part distance and voltages will change the orientation of the metal flake within the coating, causing color shift.
Increasing the KV may darken color.
Decreasing the distance may darken color.
Increasing the distance may lighten color.
Decreasing the KV may lighten color.
Changes in the powder delivery rate and total film thickness will also affect color. Control both factors.
Dry blended powders may stratify.
Higher metallic concentrations can lead to short circuits in powder delivery system.
Frequently purge the gun with air to maintain a clean tip.