Sprayable Polyurea Coatings

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Packaging:

ORPC Sprayable Polyureas and polyurea coatings are packaged in 5 gallon and 55 gallon drums. They are factory purged with nitrogen to prevent moisture contamination.

Ratios:

All ORPC Sprayable Polyurea Coatings are formulated at one to one (1:1) by volume.

Physical Data:

Each of the ORPC Sprayable Polyurea Coatings has its own physical data sheet as per attached or available from our office upon request.

Abrasion Resistance:

Polyureas have medium to good abrasion resistance. They are not as good as rubber and urethane. ORPC recommends the use of its family of Sprayable Urethane Systems for best abrasion resistance.

Chemical Resistance:

Polyureas are derived from basically the same chemical family as polyurethanes and have the same chemical resistance. The chemical resistance of ORPC Polyureas will generally fall into a pH range of 3 to 11. However, ORPC Coatings have been specifically formulated to handle a wider range of chemicals especially acids, the pH range for this product is 1 to 13 at ambient temperature. For operating temperatures above ambient contact our office for specific recommendations.

Temperature Resistance:

The temperature resistance of ORPC Polyureas ranges from -50C to 150C (-60F to 300F) depending upon the product chosen and pH level. In comparison urethanes have a lower and higher temperature resistance. Contact our office for specific application recommendations.

Color Availability:

ORPC Sprayable Polyureas are available in standard base colors, black, brown, white, green, blue, yellow, red and orange. Custom colors are available upon request.

Color Stability:

Polyureas like polyurethanes will discolor over time when exposed to ultra violet sources such as the Sun or fluorescent lighting. Chalking and surface crazing will also occur over time. It is best to allow these coatings to fully cure (14 days) prior to ultra violet exposure to maximize their color stability. ORPC has formulated the OR55AL an Aliphatic Polyurea Sprayable System that will not discolor when exposed to sources of ultra violet.

Surface Preparation:

All of the ORPC Sprayable Polyurea Systems require proper surface preparation and in most cases require the use of a priming system to ensure good bonds between the polyurea coating and the substrate. Metal requires a minimum 2 mil (.002") or 50 micron profile near white grit blast.
Concrete requires either an acid etch or sandblasting. Substrates that may not require a primer are wood, open cell foam or other porous products. See ORPC Preparation Guide for Polyurea Coatings.

Primers:

Use ORPC OR-9500 priming system for bonding all ORPC Polyurea Systems to metal. For concrete use the EP series of primers, however, sufficient bonding to concrete has been achieved without using a primer system. Using or not using primer will be dependent on the job requirements and service conditions. Please contact our office for proper primer selection.
Application Equipment:

The equipment necessary to properly spray ORPC Sprayable Polyurea is one to one (1:1) ratio heated plural component spraying equipment capable of generating a minimum of 1500 psi tip pressure. However, it is recommended to apply all ORPC Sprayable Polyureas above 2000 psi tip pressure to maximize the physical properties. Plural component equipment manufactured by Graco, Gusmer, Binks, ORPC TBM and others are suitable for applying ORPC Sprayable Polyureas. Contact our office for specific recommendations and equipment quotations.

Both parts A and B must be heated. The minimum heat requirement must be capable of maintaining and spraying ORPC Polyureas at 150F or more.

The type of spray gun required is impingement mix such as those manufactured by Gusmer, Isotherm and Probler. However, ORPC highly recommends using either the Gusmer GX7 or Isotherm spray gun which utilizes fixed mixing chamber technology with a moving valve rod. This type of spray gun will give a better material mix especially with fast reacting polyurea coatings.

Application Methods:

ORPC Sprayable Polyurea Coatings are sprayed in the same manner as other coatings. Basic spraying techniques are used such as the cross-hatch method (left to right, alternating up and down) to achieve a uniform coating thickness. Because of the fast reaction times of ORPC Sprayable Polyurea coatings the required thickness can be built up immediately without waiting between coats for materials to set up.

The part B must be thoroughly mixed prior to use and it is also advisable to have a continuous mixer on the part B to insure ingredients do not separate during application.

Heat and pressure are the two necessary requirements to successfully apply ORPC Sprayable Polyureas. Keep the heat on both part A and B at 160F and the spray gun tip pressure above 2000 psi to insure good application results.

It is not advisable to apply these coatings below 5C (45F). Avoid applying the coatings on high humidity days as they will tend to blush. Pay attention to dew points when applying to metal.

All polyureas will go through a brittle stage for 2 to 3 minutes after applying at 160F. The lower the temperature polyureas are applied at the longer this brittle stage will be. Recoat times:

ORPC Sprayable Polyureas must be recoated within 12 hours to insure good intercoat adhesion. If this is not possible the freshly applied coating can be reprimed with ORPC OR-9500 to insure intercoat adhesion for the next days application or sanding the surface will also insure intercoat adhesion.

Material Finish:

Because of the fast reaction times of Polyurea coatings a smooth, glossy finish will not be possible unless the article being sprayed is small enough to be sprayed faster than the reaction times. You more than likely will have an “orange peel” effect or “pebble” finish due to overspray.

Repairability:

ORPC Sprayable Polyurea coatings can be easily repaired if required. ORPC manufactures a number of room temperature curing elastomeric repair material kits for field or shop use. Contact our office for product recommendations.

Safety:

ORPC Sprayable Polyureas are 100% solids containing no VOCs and are non flammable in shipping, storage and application.

ORPC Sprayable Polyureas should be treated like any other coating. For confined space entry full face fresh air breathing apparatus must be worn. For outdoor and spray booth applications a minimum nose and mouth respirator with organic vapor cartridges must be worn. Full skin protection must also be used. See ORPC Safety Guide For Polyurea Coatings and ORPC MSDS (material Safety Data Sheets for each specific product.

Warranty:

ORPC Adhesive Products Inc. warrants all products to be free from defects of material workmanship. All of the recommendations and uses are provided based on laboratory and field experience. ORPC will not be liable for any application failures other than the cost of coating material replacement. Material compatibility is based upon laboratory tests and should be confirmed by the customer prior to use.

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N6860 Forest Ridge Road | Ripon, WI 54971 | 920-748-3085 | Fax 920-748-3369