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Mar-Con® 551 Polycarbonate Forming Grade

Mar Resistant Plastic

Mar-Con® 551 Polycarbonate - Forming Grade is an abrasion resistant plastic sheet product designed for a variety of high performance end uses in which the sheet will be heat formed or bent into soft radius shapes. It is a premium, high optic grade, polycarbonate sheet, coated with SciCron’s Mar-Con 551 advanced technology cross linked coating. This coating has excellent resistance to a wide variety of chemicals and solvents and is considerably more abrasion resistant than the polycarbonate plastic substrate. This combination of properties provides enhanced resistance to hazing, marring, abrasion, and scratching of the sheet surfaces from cleaning, handling, or defacement efforts. Mar-Con® 551 Polycarbonate - Forming Grade also exhibits excellent impact resistance and flame spread properties. This product can be used in many more applications than would be practical for an uncoated acrylic sheet.  Mar-Con 551 can be applied to thin gauge materials without suffering from distortions caused by typical thermal curing processes.

Mar-Con® 551 Polycarbonate - Forming Grade is designed to be used where there is concern about marring of the surfaces of the plastic sheet from handling and other moderate abuse. It is also designed for applications requiring improved splash and wipe down resistance to many common chemicals and solvents which would normally damage the polycarbonate sheet surfaces. The Forming Grade Mar-Con 551 surface helps prevent such damage from short-term exposures to these materials. Mar-Con® 551 Polycarbonate - Forming Grade include formed fabricated items, such as; equipment covers, display components, windshields, safety shields, and curved machine guards.

Mar-Con Polycarbonate® 551 Polycarbonate - Forming Grade is easily fabricated into flat and bent surface configurations using the same equipment employed with uncoated polycarbonate sheet products. The product is designed to accommodate drape forming and heat bending, however, care must be taken to avoid applying too much heat to prevent damage to the mar resistant coating. Soft radii shapes and bends can be achieved which are smooth, clear, and uniform, if recommended forming techniques are employed. Some distortion and loss of mar resistance in a bend area is normal.  On tight bends, particularly in thicker materials, there may be some very fine haze lines in the bend area. When solvent welding, it is necessary to remove the coating mechanically to achieve a good bond. Note: This product is not designed for vacuum formed or drawn configurations. For more information, refer to SciCron Technologies Technical Information Bulletin No. MP-02.

Features and Benefits
  • Flexible, abrasion resistant, durable surface
    The Forming Grade Mar-Con surface, more abrasion resistant than the base plastic, reduces risk of damage to the sheet surfaces from frequent cleaning and handling.
  • Superior chemical and solvent resistance
    Reduces risk of solvent or chemical damage to the sheet surfaces.
  • Excellent optical properties
    High clarity, high gloss coating on a high optic substrate maintains optimum light transmission without distortion.
  • Advanced technology, uniform surface treatment
    Provides enhanced mar and chemical resistance without changing the appearance of the polycarbonate surfaces.
  • Superior impact resistance
    Provides exceptional shatter resistance for safety.
  • Superior flame spread properties
    Provides additional protection in a fire.
  • Superior forming and bending properties
    Results in optimum heat forming during part fabrication.

The Forming Grade Mar-Con surface can be cleaned with a variety of common cleaners (see below for specific recommendations). Care should be taken to avoid the use of any cleaner or cleaning solution which contains an abrasive. In addition, all wipes, sponges, and drying towels should be clean and free of any grit which could damage the surface.

Mar-Con® 551 Polycarbonate - Forming Grade is available in clear, black opaque, and transparent gray and bronze tints. Other colors may be available upon special request.

Standard Dimensions
Thickness: 3mm (1/8"), 4.5mm (3/16"), 6mm (1/4"), 9mm (3/8"), 12mm (1/2") plus films 10-90 mils
Standard Sheet Size: 48" x 96"
Other sizes and thicknesses available upon request.

  Made in USA

Typical Physical Properties  (Typical but not guaranteed values for 0.25 inch material)

Property Test Method Units Mar-Con Polycarbonate - Forming Grade
Specific Gravity
Taber Abrasion1 - Change in Haze
Weighted Steel Wool Rub Resistance2


 ASTM D1044




Visual Scratches


Less than 10

Light Scratches

Tensile Strength
Tensile Modulus
Flexural Strength
Flexural Modulus
Compressive Strength
Izod Impact Strength (milled notch)
ft-lb/inch of notch
Deflection Temperature (264 psi load)
Vicat Softening Point
Maximum Continuous Service Temperature
Coefficient of Thermal Expansion
Coefficient of Thermal Conductivity
ASTM D1525
3.8 x 10-5
Horizontal Burn (Flame Spread)
UL 94 Rating of the Uncoated Substrate

UL 94

UL Classification

Less than 1.0
V-2 < 0.236 inch
V-0 ≥ 0.236 inch
3mm Transparent Clear Transmittance - Total
ASTM D1003
ASTM D1003
Less than 1.0

1. Test conditions - 500 gram load, 100 revolution exposure, CS-10F Calibrase Wheel - Change in haze for the same Taber abrasion exposure on uncoated polycarbonate - over 42%.
2. Test conditions - 14 strokes of #0000 steel wool under a 2 pound (908 gram) rounded point load - Damage for the same exposure on uncoated polycarbonate - very heavy scratches.

Chemical Resistance ASTM D-1308
Samples immersed in listed chemicals and then examined for visible attack at 15 minutes, 1 hour, and 24 hours

Chemical Time for Visible Attack
Acetone < 1 hour
Methyl Alcohol > 24 hours
Isopropyl Alcohol > 24 hours
Gasoline > 24 hours
Kerosene > 24 hours
Toluene < 1 hour
Methylene Chloride > 1 hour*
Sodium Hydroxide (10%) > 24 hours
Hydrochloric Acid (10%) > 24 hours
Sulfuric Acid (10%) > 24 hours
Nitric Acid (10%) > 24 hours

* Solvent attacked specimen edges immediately, coating intact for more than 1 hour.

Cleaning and Graffiti Removal

Solvents and Cleaning Liquids Found Effective Under Laboratory Conditions

Aqueous solutions of the following can be applied carefully with a soft cloth or sponge for ordinary dirt and grime.

        Joy®                Windex®
        Formula 409®  Sparkle™

Rinse with clean water before drying with a chamois or cellulose sponge.
Never use an abrasive cleaner or scouring pad.

The following solvents can be used to remove graffiti and other stubborn stains.

        Isopropyl Alcohol      Methanol
        Naphtha (VM&P Grade)  Kerosene
        Butyl Cellosolve (for paints, inks, lipstick, etc.)

Always remove residual solvent with an aqueous cleaner and a final rinse with clean water.

  1. Polycarbonate plastic is a combustible thermoplastic. Avoid exposure to flame and excessive heat. Observe fire precautions appropriate for comparable forms of wood and paper.
  2. For building applications, comply with applicable code regulations.
MCPCFG-5 2/21

The information and statements contained herein are believed to be accurate, however, users should perform their own testing and verification to determine the durability, applicability and suitability of the products for their own purposes.  NOTHING CONTAINED HEREIN SHALL BE CONSTRUED AS A REPRESENTATION OR WARRANTY OF ANY KIND, EXPRESS OR IMPLIED.  IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY EXCLUDED.  All sales are subject to SciCron’s standard terms and conditions of sale, which can be found at:  http://www.sctech.com/termscon