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
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-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.
ADVANTAGES TO POLYCARBONATE
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
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.
MORE ADVANTAGES TO POLYCARBONATE
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.
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.
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.
High temperature and pressure windows
Industrial equipment and housing components
Medical equipment components
Electrical insulators and connectors
Aircraft & Missile components
Portholes in pressure chambers
Jet pump impellers and diffusers
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
(recommended for "see-through" applications).
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.
PRIMARY SPECIFICATION||Polycarbonate, Natural and Black||ASTM D-3935 PC110B34720
||Polycarbonate, 20% Glass-filled||ASTM D-3935 PC110G20A33230
AGENCY APPROVALS OR LISTING : FDA, USP
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)
Makrolon® Sheet Cleaning Instructions
Makrolon® Sheet Design/Forming/Fabrication
Makrolon® Sheet Recycle Statement
Vapor Polishing information
Also see Polycarbonate Structured Sheet
Call today for complete product information!