requently Asked Questions


 Do you have any standard Korad® Colors? 
 What are the typical properties of free film? 
 Who can I contact to discuss printed Korad®? 
 Is Korad® related in any way to other impact modified acrylics like Plexiglas® DR? 
 Have the ingredients, composition, or polymerization that produce Korad® changed since 1966? 
 Are any plasticizers or lubricants ever incorporated into Korad®? 
 Does Korad® film itself require any UV stabilization?
 What ingredients are added to Korad® to produce clear and transparent grades of film? 
 What ingredients are added to Korad® to product colored film? 
 Are UV absorbers added to colored Korad® films? 
 What ingredients are added to Korad® to produce a matte film? 
 What are the clear grades of film that Spartech PEP offers? 
 In what forms is Korad® available? 
 Can Korad® be repaired? 
 Can Korad be cleaned or waxed? 
 What quality control procedures are used to ensure the quality of the Korad® film? 
 What are the standard widths of Korad® film? 
 What are the standard thicknesses of Korad® film? 
 What is the approximate yield for typical gauges of Korad®? 
 What is the minimum thickness recommended for Korad®? 
 How is Korad® film used in an application? 
 What techniques are used to laminate Korad® to its substrate? 
 How do you laminate Korad® to its substrate? 
 What techniques should be used to laminate Korad®? 
 Can Korad®capped parts be painted or coated to change color? 
 Can regrind containing Korad® be re-extruded? 
 


Do you have any standard Korad® Colors?
Yes we do! - Please have a look to the Product Overview.

What are the typical properties of free film?
The typical properties are listed under "Product Data".

Who can I contact to discuss printed Korad®?
Please talk to the ASP Plastics team first. - You can reach us at: info@asp-plastics.com.

Is Korad® related in any way to other impact modified acrylics like Plexiglas® DR?
No, other impact modified acrylics (including DR) are physical or liquid mixtures of ingredients.

Have the ingredients, composition, or polymerization that produce Korad® changed since 1966?
No. Therefore, the performance of Korad® has been consistent fro over 40 years.

Are any plasticizers or lubricants ever incorporated into Korad®?
No. Korad®, through its unique composition and structure does not require such additives. Its properties come entirely from polymerization.

Does Korad® film itself require any UV stabilization?
No. Korad® is a 100% acrylic polymer and is, consequently, impervious to the effects of UV radiation.
 

What ingredients are added to Korad® to produce clear and transparent grades of film?
UV absorbers and antioxidants are incorporated into clear and transparent grades of Korad®. The UV absorbers protect the substrate below the Korad after lamination while the antioxidants protect it during processing. Benzotriazole is the absorber used as it provides the best UV protection over the widest range of radiation from the sun.
 

What ingredients are added to Korad® to product colored film?
High and low gloss colors of Korad® film are designed with inorganic pigments. The pigments selected have demonstrated their color stability in acrylic polymers and paint coatings for over 40 years. All colors are formulated from a fixed palette of pigments.

Are UV absorbers added to colored Korad® films?
No. UV screening is provided by the presence of the high concentrations of the pigments used. Visible light protection is also provided the substrate by the presence of these same high concentrations of pigments. Colored films are manufactured to a very high opacity with typical contrast ratios exceeding 97%.
 

What ingredients are added to Korad® to produce a matte film?
Micro pulverized inorganic and organic materials like silica and/or cross linked acrylic polymers. Matting is created internal to the film and is not affected by heating, stretching, or thermoforming. These same ingredients are used in clear and colored film.
 
 

What are the clear grades of film that Spartech PEP offers?
Spartech PEP offers 4 grades of clear and/or transparent film: 2 high gloss clear (05001 & 05005) and 2 Matte (05701 & 05805). All four products provide a UV screening surface over the substrate. 05005 & 05805 have improved stress whitening and water whitening resistance compared to the matte grades, but are also more expensive.
 

In what forms is Korad® available?
In what forms is Korad® available?

Can Korad® be repaired?
Yes. Look here under "Handling & Care"

Can Korad® be cleaned or waxed?
Yes. Look here under "Handling & Care"

What quality control procedures are used to ensure the quality of the Korad® film?
Reactor resin and other ingredients are blended in large quantities and are intensively compounded to be homogeneous. The film thickness is controlled by a continually oscillating extrusion blown film die and a rotating air ring. Continuous online statistical quality control procedures are used to monitor gauge, color, light transmission, and gloss.
 

What are the standard widths of Korad® film?
Typically Korad® is produced at 50", 54", and 62". It can be slit to widths as small as 2" and can be unfolded to width as wide as 120". Custom widths carry an up charge and minimum quantities may apply depending on gauge and color.
 
 

What are the standard thicknesses of Korad® film?
Typically, it is produced at 2.0 Mils (50 microns), 3.0 Mils (75 microns), and 6.0 Mils (150 microns). Intermediate thicknesses are available on request and the appropriate thickness is typically determined by the application.
 

What is the approximate yield for typical gauges of Korad®?
Look here under "Effectiveness"

What is the minimum thickness recommended for Korad®?
1.8 Mils (.0018). In order to benefit from the protective properties of Korad®, a minimum of 1.8 mils must remain AFTER the sheet is stretched, bent, or thermoformed.
 

How is Korad® film used in an application?
Korad® film is always laminated to a substrate. It is the substrate that provides structural integrity to the laminate. Primary substrates include: ABS, Polystyrene, PVC, Polycarbonate, Acrylic, ASA, Melamine, Thermoset Polyester Resin, and Thermoset Urethanes.
 
 

What techniques are used to laminate Korad® to its substrate?
Korad® is typically laminated to thermoplastic sheet continuously during the extrusion process. It may be applied with platen pressing, but care must be taken to use appropriate release agents on the platen surfaces. Korad® has also been laminated in reaction casting processed to polyesters and urethanes.
 

How do you laminate Korad® to its substrate?
Korad® is permanently bonded to plastic sheet substrates by passing the film and hot plastic sheet thru polishing and embossing rolls during the sheet extrusion process. Lamination is accomplished with the heat and roll pressure alone. No adhesive is required. Optimum adhesion to a smooth surface requires slightly higher polymer and roll temperatures than an embossed surface.
 

What techniques should be used to laminate Korad®?
Correct tension of the film is a key to successful lamination as sufficient tension is needed to ensure that the film will lie flat on the extruded sheet. Film contact with the laminating roll should be minimum, certainly less than 45 degrees. The longer the Korad® is in contact with the laminating roll, the greater the shrinkage which can create wrinkles and creases.
 

Can Korad® capped parts be painted or coated to change color?
Absolutely! No primer is required. Thorough cleaning will usually provide a readily paintable surface. Korad® is itself an outstanding primer. The user should do some testing, but a variety of solvent and water based coatings have been successfully used.
 

Can regrind containing Korad® be re-extruded?
Yes it can! Regrind containing Korad® has been successfully used in ABS, Polystyrene, PVC, and Acrylic. In general, normal scrap generated is completely recoverable and at the same levels as non-Korad capped scrap.