San Diego Plastics
San Diego Plastics, Inc.
2220 McKinley Ave.
National City, CA 91950
800/925-4855       619/477-4855       Fax 619/477-4874
POLYCARBONATE (Makrolon®, Lexan®, Zelux®)






Polycarbonate sheet

Polycarbonate is a tough, dimensionally stable, transparent thermoplastic that has many applications which demand high performance properties. This versatile thermoplastic maintains its properties over a wide range of temperatures, from -40"F to 280"F. It is available in three types: machine grade; window and glass-filled. It is the highest impact of any Thermoplastic, transparent up to 2" in special grades, outstanding dimensional and thermal stability, exceptional machinability, stain resistant and non-toxic with low water absorption.

Machine Grade is relatively stress free to permit the most demanding machining. It is also available in glass-filled. This polycarbonate is perfect for high performance uses in tough applications over a broad temperature range.

Window Grade is optically clear, providing total luminous transmittance and very low haze factor. The high impact strength makes it resistant to repeated blows, shattering and spalling.

Glass Filled
Glass-reinforced polycarbonate is finding principal applications in designs where metals, particularly die-cast aluminum and zinc, are commonly used. The coefficient of thermal expansion is reduced by nearly 75%, thus equaling that of some metals. While glass-reinforced has less impact strength than standard grades, it is still tougher and more impact resistant than most other plastics and die cast aluminum.


Impact strength
Unnotched polycarbonate is virtually unbreakable, making it extremely safe in areas where parts may be exposed to impact. When exposed to repeated heavy blow, the material tends to cold form rather than shatter.

Polycarbonate is excellent for electrical applications, because of its high dielectric strength and high volume resistivity which decreases only slightly as temperature or humidity is increased.

Parts can be easily machined from standard metal working tools. No special tools are needed, and finished parts can be polished to a high gloss. Water or water-soluble cutting oils should be used when machining polycarbonate, since some standard cutting oils will attack the material. Polycarbonate can be machined on standard metalworking or woodworking equipment. Its unique properties permit it to be machined without chipping, splitting, or breaking.

Polycarbonate slab (Zelux) has been stressed relieved using Liquo-Temp annealing process. In some instances where extensive machining is required, a secondary annealing of semi-finished parts is highly recommended. Secondary annealing can be accomplished by heating parts at 250"F in a desiccated air circulating oven for one hour per one inch of thickness. After heating, the oven should be turned off and allowed to cool to room temperature spontaneously.

Polycarbonate can be mechanically bonded by standard methods. It can also be cemented by using a solvent such as methylene chloride or adhesives such as epoxy, urethane and silicone. Polycarbonate and also be ultrasonically or vibrationally welded.

Removing paint or other materials
Fresh paint may be removed by rubbing lightly with a cleaning material such as isopropyl alcohol, or VM-P grade naptha. Then the sheet should be washed immediately with a mild soap or detergent in warm water, and rinsed thoroughly with clean water. Grease and glazing compound may similarly be removed from the surface with the above mentioned cleaning materials. Weathered paint may be lifted off the sheet with masking tape. Razor blades or other sharp scraping tools should never be used.


Standard polycarbonate sheet is not heat formable; however, formable sheet is available on a custom basis. Standard Lexan polycarbonate sheet can be heat formed with proper pre-drying. Lexan sheets up to 114" may also be cold formed under special conditions.

Kleenmaster Brillianize may be used. (Also see Novus) Products such as abrasive or highly akaline cleaners, acetone, carbon tetrachloride, benzene or leaded gasoline should not be used, and the sheet should not be cleaned in hot sun or at high temperatures.

Scratch Removal
Craftics 20/20 Plasti-Polish Scratch Remover is often all that is required to subdue hairline scratches and minor abrasions. Any polish, however, should be tested first on a sample area of the polycarbonate sheet.
San Diego Plastics stocks Craftics 20/20 in 8 ounce and 1 gallon sizes. (Also see Novus)

Polycarbonate products will accept painting, printing, or vacuum metalizing as decorating methods.

UV Stabilization
Natural and Black Machine grade and Window grade are UV stabilized. Polycarbonate rod, machine grade, is not UV stabilized, but is available on custom quotation.


  • Lenses
  • High temperature and pressure windows
  • Face shields
  • Industrial equipment and housing components
  • Medical equipment components
  • Instrument components
  • Electrical insulators and connectors
  • Aircraft & Missile components
  • Portholes in pressure chambers
  • Jet pump impellers and diffusers
  • Automotive parts
  • Card guides
  • Assembly line cogs


    Machine Grade (Natural, Black and Optically Clear)
    Clear or Black
    Unmodified - 3/8" to 4" thick
    Glass-Filled* - 1/8" to 4" thick (natural and black only)
    Sheet sizes:  Natural, Clear and Black 24x48, 48x96 and also 48x120 (call for availability and pricing)
    Glass filled:  24 x 48 only
    Call for price and availability

    Window Grade (Glazing Grade)
    (recommended for "see-through" applications).

    Custom Sheet
    Flame retardant
    FDA/Medical grade polycarbonate is approved for contact with wet and dry food applications and meets US. Pharmacopoeia regulations.
    Premium optical grade sheet

    Rod and Tube
    Natural, black and glass filled formulations.

    Polycarbonate, Natural and BlackASTM D-3935 PC110B34720
    Polycarbonate, 20% Glass-filledASTM D-3935 PC110G20A33230

    BASE RESINS TRADE NAMES : Lexan® , Makrolon®

    Specific gravity (ASTM D 792) : 1.20
    Tensile strength, Ultimate (ASTM D 638) : 9,000 p.s.i.
    Elongation at break (ASTM D 638) : 130%
    Tensile modulus (ASTM D 638) : 3.1x10~5 p.s.i.
    Rockwell hardness (ASTM D 785) : R118
    Impact strength (73° F) (ASTM D 256) (notched) : 17.0 ft-lb/inch
    Flexural strength (ASTM D 790) : 14,200 p.s.i.
    Flexural modulus (ASTM D 790) : 3.4x 10~5 p.s.i.
    Wear factor against steel 40 psi 50fpm : 2500x10~10
    Coefficient of friction 40psi 50fpm : 0.38 Dynamic

    Melting point : 310° F
    Heat deflection at 66 psi (ASTM D 648) : 285° F
    Heat deflection at 264 psi (ASTM D 648) : 270° F
    Maximum serving temperature for short term : 275° F
    Maximum serving temperature for long term : 240° F
    Thermal conductivity (ASTM C 177) : 1.35 Btu-inch/hr-ft~2- ° F
    Specific heat : 0.30 Btu/lb- ° F
    Coefficient of linear thermal expansion (ASTM D 696) : 3.7x10~5
    Applicable temperature range for thermal expansion : 0-200° F

    Dielectric constant at 60Hz (ASTM D 150) (73° F, 50% RH) : 3.2
    Dissipation factor at 60Hz (ASTM D 150) (73° F) : 0.001
    Volume resistivity (ASTM D 257) : 10~17 ohm-cm
    Dielectric strength (ASTM D 149) : 380 v/MIL

    Water absorption - 24 hours (ASTM D 570) : 0.15%
    Water absorption - saturation (ASTM D 570) : 0.35%
    Density (ASTM D 792) : 0.0434 lb/inch~3
    Flammability (UL 94) : V-2
    Weathering Resistance : Limited resistance (UV Sensitive)

    Craftics 20/20 Scratch Remover - CLICK HERE TO BUY ONLINE
    Craftics 20/20 Plasti-Polish Scratch Remover
    Available and in stock at SAN DIEGO PLASTICS, INC.

    Plastic has become one of the most widely used materials for all types of products, yet people are still not sure how best to clean and care for plastic. 20/20 Plasti-Cleaner is specially formulated for cleaning plastic without harming the material. Plastic will last as long and look as new as any other material, but it must be cleaned with the proper cleaner. You would not clean wood with all purpose cleaner household cleaner, and so you should not use this same type of cleaner to clean plastic. Most household cleaners, as well as glass cleaners, contain ammonia, alcohol and abrasives that can scratch, craze or whiten the plastic surface. 20/20 will clean the most stubborn of grease, dirt and grime without harming the plastic surface.

    Plastic and its care is Craftics only business. Craftics has been the leader in tools and accessories for working with plastics since 1968. 20/20 was developed over a period of several years to provide the most extensive cleaner available. Even though 20/20 was formulated for the cleaning of clear acrylic, it can be used with the same results on any hard plastic surface. This document outlines the proper care and cleaning of plastic. By using 20/20 and following these techniques, you can be assured of great looking plastic and a longer life for your plastic products.

    Use a clean, dry, lint-free, absorbent, non-abrasive cloth. Do not use rayon or polyester cloths which can scratch the plastic.

    Use a liberal amount of 20/20 Plasti-Cleaner and rub in a circular motion until all the cleaner is absorbed by the cloth. 20/20 provides extra protection against dust and fingerprints with its anti-static ingredient.

    Use 20/20 Plasti-Polish for the removal of scratches. First apply to a small area to test results before using over entire area. Use a liberal amount of polish and rub in a circular motion and let dry to a haze. Then wipe haze off with a clean dry cloth (much like polishing a car). For badly scratched areas, you may have to make several applications. When making multiple applications of polish, use 20/20 Plasti-Cleaner between every 2 polish applications for best results.

    CLICK HERE TO BUY Craftics 20/20 Plasti-Polish Scratch Remover Online

    Call today for complete product information!



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