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Uniflex 255
Wood Fiberglass Concrete Steel
UNIFLEX 255 Aliphatic

UV/Color Stable Polyurethane Coating
A two-part polyurethane finish formulated for high tensile strength and protection from degradation caused by weathering and UV exposure.

We are sorry to report that the Uniflex 255 Aliphatic is no longer available from the manufacture it was a great product for us. We have found a different product Elasta-Tuff 6000-AL-HS that we are selling in it's place. If you have questions that are not answered on our site, please feel free to contact us.

UNIFLEX 255 Aliphatic is a two-component elastomeric, abrasion resistant polyurethane finish/final coating. It is formulated from an all-aliphatic, light stable polymer which allows for a wide range of UV stable colors. UNIFLEX 255 Aliphatic possesses high tensile strength as well as an excellent balance of elongation, hardness and abrasion resistance, resulting in long term wear and impact protection. The dense finish is also resistant to staining and dirt pickup, which aids in cleanability.

UNIFLEX 255 Aliphatic is an extended pot life system designed for use with standard airless spray equipment as well as brush or roller.

Basic Uses
UNIFLEX 255 Aliphatic was developed as a topcoat for protecting ELASTUFF 120 from degradation caused by normal weathering and ultraviolet exposure, and as a primary coating for wood, concrete or steel where the extra protection of the ELASTUFF 120 is not required.

As a top coating, UNIFLEX 255 Aliphatic provides a semi-gloss, wear resistant finish for boat and pedestrian decks, stairways, patios, balconies, and to protect any primed wood, concrete, fiberglass, polyester and steel. Uniflex is slick when wet or icy. When used on exterior stairs, patios, decks and walkways, we recommend the use of a non-skid additive such as silica sand or non-skid strips applied to the surface.

  Flint Gray
Note: Colors shown above are close approximations. Actual colors will vary slightly depending on the color accuracy of your monitor as well as other factors.

Uniflex 255 Aliphatic
Typical Properties/Wet

• Mixing Ratio: 7 Parts A to 1 Part B by volume (7A:1B)

• Mixed Usable Pot Life: 24 hours @ 70°F (21°C), 50% R.H.

• Solids by Weight (Mixed): 70% (±3) [ASTM D 2369]

• Solids by Volume (Mixed): 55% (±2) [ASTM D 2697]

• Dry Time To Walk On: 6-10 hours @ 70°F (21°C), 50% R.H.

Typical Properties/Cured

• Tensile Strength: 3200 psi (225 kg-force/sq. cm.) ±3.125% [ASTM D 412]

• Elongation: 200% (±25) [ASTM D 412]

• Tear Strength: 350 lbs./in. (63 kg./cm.) ±7.14% [ASTM D 1004]

• Hardness: 90-95 Shore A / 50-55 Shore D [ASTM D 2240]

• Gloss: 40 (60° Gardner) Semi-Gloss [ASTM D 523]

• Permanence: 4.0 Perms at 12 dry mils [ASTM E 398]

• Low Temperature Flexibility: Passes 180° flex 1/4 inch (6.35 mm) mandrel bend @ 0°F (-18°C)
[Federal Test Method No. 141 a-6221]

• Low Temperature Impact Resistance: No surface cracks or breaks over cement board or plywood surfaces. 4.6 oz. (130 gram) 1 1/4" (32 mm) steel ball dropped from a height of 5' (1.5 meters) at -21°F (-30°C)
[Test adapted from Nation Bureau of Standards]

• Abrasion Resistance: 0.0016 oz. (45 mgs.) weight loss after 1000 cycles using CS-17 wheels and 2.2 lbs. (1000 grams) weights on Taber Abraser [ASTM D 4060]

Performance and Advantages

Abrasion Resistance: UNIFLEX 255 Aliphatic is more resistant to severe abrasion than most other elastomeric and rubber linings and coatings. The following is a comparison as tested on a Taber Abraser, using H-10 wheels with 2.2 lbs. (1000 grams) weights at 1000 revolutions. Tested in accordance with ASTM D 4060.

AR Plate Steel . . . . . . . . . . . . . . . . 0.017 oz. (487 mgs.)
Boralloy Steel . . . . . . . . . . . . . . . . 0.015 oz. (430 mgs.)
UNIFLEX 255 Aliphatic . . . . . . . . . 0.0032 oz. (91 mgs.)

Resistance to Accelerated Weathering: UNIFLEX 255 Aliphatic test panels were placed in the QUV Accelerated Weathering Tester. Cycling was set at 4 hours of ultraviolet radiation, during which time temperatures reach approximately 135°F (57°C), and 4 hours with no radiation. A water bath at the bottom of the unit is maintained at 100°F (38°C) to create constant high humidity conditions. After 2,000 hours of continuous testing, UNIFLEX 255 Aliphatic had no surface checking or cracking, no delamination, and no loss of flexibility. Tested in accordance with ASTM B 117.

Resistance to Salt Spray: Test panels were placed in the Harshaw Salt Spray Cabinet and maintained at a temperature of 95°F (35°C), utilizing a sodium chloride fog solution of not less than 5% by weight. After 500 hours of continuous testing, UNIFLEX 255 Aliphatic had no loss of adhesion, no blistering or softening, and no loss of flexibility. Tested in accordance with ASTM B 117.

Resistance to De-Icing Chemicals: UNIFLEX 255 Aliphatic test panels were exposed to freeze-thaw cycles under complete immersion in a 4% calcium chloride solution. Cycles consisted of 16 hours at 0°F (-18°C) and 8 hours at 75°F (24°C). After 10 complete cycles, UNIFLEX 255 Aliphatic remained unaffected, with no loss of adhesion, and no blistering or softening. Test method adapted from ASTM C 672.

Resistance to Condensation: Test panels were placed in the QCT Condensation Cabinet and maintained at a temperature of 120°F (49°C) and 100% relative humidity. After 500 hours of continuous testing, UNIFLEX 255 Aliphatic had no apparent physical damage. There was a slight loss of gloss. Tested in accordance with ASTM D 2247.

Water Absorption: After 30 days immersion in distilled water at 75°F (24°C) there were no visible effects. All elastomeric properties were retained. Tested in accordance with ASTM D 543, ASTM D 412.

Chemical Resistance: UNIFLEX 255 Aliphatic was applied at a total of 20 dry mils (508 dry microns) over cement board test panels. Test panels were cured at 75°F (24°C), 50% R.H. for 6 days plus 125°F (52°C) for 1 day before exposure to test solutions. Tests were conducted at 75°F (24° C) with the chemical placed on top of the test panels under watch glass covers. After 30 days of continuous testing the results were as follows:

Salt Solution (Saturated NaCl). . . . . . . . . . . No Effect
Gasoline. . . . . . . . . . . . . . . . . . . . . . . . . No Effect
Unleaded Gasoline. . . . . . . . . . . . . . . . . . . No Effect
Gasohol. . . . . . . . . . . . . . . . . . . . . . . . . . No Effect
Diesel. . . . . . . . . . . . . . . . . . . . . . . . . . . No Effect
Motor Oil. . . . . . . . . . . . . . . . . . . . . . . . . No Effect
Suntan Oil. . . . . . . . . . . . . . . . . . . . . . . . No Effect
Suntan Lotion. . . . . . . . . . . . . . . . . . . . . . No Effect

Adhesive Strength: UNIFLEX 255 Aliphatic was applied at a thickness of 10 dry mils over Elastuff 120 applied 20 dry mils (508 dry microns) over cement board test panels sealed with UNI-TILE (similar to CPES™). After test panels were allowed to fully cure, the bond strength was tested. The bond of UNIFLEX 255 Aliphatic to Elastuff 120, and the bond of the basecoats to the sealed substrate proved to be outstanding, exceeding the cohesive strength of the coating.

Low Temperature Flexibility: UNIFLEX 255 Aliphatic retains its ability to withstand multiple 1/4" (6.35 mm) mandrel bends without cracking at temperatures to 0°F (-18°C). Tested in accordance with Federal Test Method Standard No. 141 a-6221.

Surface Preparation

Polyurethane basecoats which are to be topcoated with UNIFLEX 255 Aliphatic must be dry and clean, and free from any dirt, grease, oil, pollution fallout, or other foreign contaminants which could interfere with proper adhesion. For further information on basecoat application of Elastuff 120, see the tech sheet for that product.

Ideally, polyurethane basecoats should receive UNIFLEX 255 Aliphatic as soon as the basecoat surface has cured sufficiently to walk on. In any event it should be topcoated before achieving total cure, which can vary from 2 to 7 days depending upon basecoat used and weather conditions at time of application.

When UNIFLEX 255 Aliphatic is applied directly to wood, fiberglass, concrete or steel substrates, the following surface preparation procedures should be followed:

Wood Wood Surfaces: Wood should be dry and clean, and free from any dirt, grease, oil, pollution fallout, or other foreign contaminants which could interfere with proper adhesion. Clean surfaces shall be primed with CPES™ (Clear Penetrating Epoxy Sealer) at the rate of 250 to 300 sq. ft. per gallon (6 to 7 sq. meters/liter). However, the amount of CPES™ required will vary, depending on the absorbency of the wood.

On large new plywood decks or platforms, all the joints must be backed and left with a 1/8" (3 mm) gap between sheets. 3M™ 4200 or 3M™ 5200 polyurethane sealant, or other pure polyurethane sealants, should be applied and troweled flush into the opening. After curing, the seams should have polyester reinforcing fabric embedded into a strip coat of UNIFLEX 255 Aliphatic.

Fiberglass Fiberglass Surfaces: Fiberglass shall be dry and clean, and free from any dirt, grease, oil, pollution fallout, or other foreign contaminants which could interfere with proper adhesion. All fiberglass surfaces should then be scuff sanded and wiped down with MEK or vacuumed to remove all dust.

UNIFLEX 255 Aliphatic achieves an excellent bond to fiberglass surfaces prepared in this manner with no primer required. If fiberglass is chalky or oxidized, apply a prime-coat of CPES™ (Clear Penetrating Epoxy Sealer) at the rate of 300 to 400 sq. ft. per gallon (7 to 10 sq. meters/liter).

Concrete Concrete Surfaces: Concrete should be dry and clean, free from any dirt, grease, oil, pollution fallout, smoke, wax, form release agents, surface chemicals, or other foreign contaminants which could interfere with proper adhesion. Surfaces should be free of sharp projections, ridges and loose aggregate.

Sandblasting of concrete will be required if the surfaces are contaminated to the point that acid, chemical cleaning or power washing is not sufficient for removal. Concrete surfaces having a smooth, steel troweled finish must be acid etched or sandblasted.

Prior to sealer application, all loose material, foreign objects, dirt and dust shall be removed by use of a power vacuum. Immediately after vacuuming is completed, concrete surfaces should be sealed with one (1) coat of CPES™ (Clear Penetrating Epoxy Sealer) or UNISEAL epoxy sealer, applied by roller or airless spray at the rate of 250 sq. ft. per gallon (6 sq. meters/liter).

After sealer has completely dried, all cracks, control joints, cold joints and voids shall be filled with 3M™ 4200 or 3M™ 5200 or other pure polyurethane sealants. Cracks larger than hairline should be reinforced with polyester reinforcing fabric, embedded into a strip coat of UNIFLEX 255 Aliphatic. At the intersection of concrete walls and slabs, apply sealant in the same manner, extending a minimum of 1 1/2" (38 mm) vertically and horizontally. UNIFLEX 255 Aliphatic is not designed to bridge cracks greater than 1/32" (0.79 mm) in width. Sealant shall be allowed to cure a minimum of 24 hours prior to the application of UNIFLEX 255 Aliphatic.

Steel Steel Surfaces: Steel must be dry and clean, and free of excessive rust scale, pollution fallout, dirt, grease, surface chemicals or other foreign contaminants prior to blast cleaning. Steel surfaces must be cleaned to Near-White (SSPC-SP10) with a minimum anchor pattern of 2.0 mils (51 microns).

The blast-cleaned surface shall be primed by the end of the same work day, but in any event before any visible rusting occurs. If rusting occurs after blast cleaning, the surface should be reblasted before priming.

Steel surfaces shall be primed with Primer 302 at 250 to 300 sq. ft. per gallon (6 to 7 sq. meters/liter) for a minimum thickness of 1.0 to 1.5 dry mils (25 to 38 dry microns), depending on surface profile. UNIFLEX 255 Aliphatic should be applied to the primed surface within 24 hours of application.

Packing and Mixing

Mix seven (7) volumes of Part A with one (1) volume of Part B. Part A is furnished in 1 gallon cans containing 7 pints (3.3L). Part B is furnished in 1 pint cans (0.48L). Part A should be power mixed (with a electric drill paddle for a minimum of 5 minutes),then again after adding Part B. Appropriate amounts of silica sand are supplied with each order (upon request) and can be added after mixing A and B if a non-skid surface is desired.

Coating Application

UNIFLEX 255 Aliphatic can be applied by brush, roller or squeegee. If using a roller for application, we recommend using either a short-nap mohair roller or foam roller covers that are approved for resin use.

The second coat may be applied as soon as the first application is dry enough to accept the roller/brush or as soon as the surface can be walked on. Generally, the second coat is applied the following day. If the first coating remains uncoated for longer than two weeks, it is recommended that the surface be wiped down with xylene before the second coating is applied.

UNIFLEX 255 Aliphatic applied at the coverage rate of one gallon per 100 sq. ft. (2.5 sq. meters/liter) of the combined Part A and Part B will theoretically yield 8.8 dry mils (223 dry microns). Actual gallons required on the job to achieve the minimum dry mil film thickness will depend upon the surface texture, technique of the applicator, and weather conditions at the time of application. It is the responsibility of the applicator to apply sufficient material to achieve the required dry mil film build. The following dry mil thicknesses are minimums required:

Applied Over Polyurethane Basecoats
      Non-abrasive conditions:   8 to 10 dry mils
      Pedestrian traffic:   10 to 12 mils
      Light vehicular traffic:   12 to 15 mils
      Moderate vehicular traffic:   15 to 18 mils
Applied Directly Over Other Substrates (non-vehicular traffic areas)
      Wood:   14 to 18 mils
      Fiberglass:   12 to 15 mils
      Concrete:   15 to 20 mils
      Steel:   12 to 15 mils
High wear areas will require additional millage.
10 mils = 0.01 inches = 254 microns = 0.254 mm

Applications utilizing UNIFLEX 255 Aliphatic topcoat will normally require one or two coats. Higher build applications or applications directly to wood, fiberglass, concrete or steel will require a minimum of two separate coats. Crisscross techniques should be used to ensure even coverage. All surfaces must be uniformly coated and free from voids, pinholes and blisters.

Non-skid aggregate (spherical sand or pumice), if desired, should be broadcast into the second from last coat of UNIFLEX 255 Aliphatic, or blended into the final coat mix and roller applied to achieve a uniform fine texture finish.

A minimum aggregate size of 30 mesh should be utilized when broadcasting into the second to last coat. The aggregate can either be broadcast evenly throughout the wet coating at 8 to 10 pounds per 100 sq. ft. (4 to 5 kg per 10 sq meters), or for a heavier texture can be broadcast to refusal. When the intermediate coat has dried, sweep off the excess aggregate prior to topcoating with the final coat of UNIFLEX 255 Aliphatic. For a finer finish, use 60 to 80 mesh aggregate, added to the material for the final roller applied application.

UNIFLEX 255 Aliphatic should not be applied when the ambient temperature is below 50°F (10°C), or if rain is anticipated within 24 hours of application. Minimum storage temperature of 40°F (4.5°C) is recommended. Store UNIFLEX 255 Aliphatic in a warm area prior to application for sufficient length of time to bring material temperature to 75°F (24°C).

If thinning is required for application, use xylene solvent sparingly. Clean equipment with MEK or methylene chloride.

Cleanup, Shelf Life and Storage
Use M.E.K. or Methylene Chloride for cleanup. Shelf life of Part A and Part B components in unopened containers is 6 months from date of shipment. Material must be stored at temperatures between 50°F and 100°F (10°C and 38°C). Do not open the containers until ready to use the material.

UNIFLEX 255 Aliphatic components are affected by moisture prior to catalyzation and must be protected from moisture contamination. Keep all containers tightly closed during storage. Containers are factory sealed with an inert gas to prevent contamination. After opening and if all components are not to be used, containers must be tightly sealed. Shelf life of an opened container is very limited.

Solvents in UNIFLEX 255 Aliphatic are flammable. Use only in a well ventilated area. Keep away from heat, sparks, open flame or lighted cigarettes. This includes electric motors such as power drills, washing machines, and fans, and pilot lights on gas fired furnaces. Avoid breathing the vapor or spray mist. For exterior applications, approved (MSHA/NIOSH) chemical cartridge respirators should be worn. If used indoors, provide mechanical exhaust ventilation. Avoid contact with eyes and contact with skin.

WARNING: Uniflex 255 contains flammable solvents and isocyanate. The vapor can be harmful if breathed in concentrated amounts over a period of time. We recommend the use of an organic fumes rated respirator, such as our Moldex respirators. Because of the isocyanate catalyst, NIOSH recommends the use of a N95 or better particulate pre-filter. Our prefilters are N95 rated. Avoid contact with eyes and contact with skin.

Uniflex 255 is a hazardous product. Check the shipping options on the order form for details on shipping hazardous items. For additional information refer to the Uniflex 255 Material Safety Data Sheet.

www.rotdoctor.comWood Treatment & Preservation Products
OrderProductsUsing EpoxiesUsing PolyurethanesTestingWooden BoatsFiberglass BoatsHomesLog HomesQ & A
Product Line & Price ListMSDS SheetsApplication Guide

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