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Introduction: Optical Media

Disccoat 4210 is an easy to apply, strippable coating to protect substrates from scratching and marring during polishing, handling and storage. Can be applied by spinning or dipping. Will not leave a residue.

General Chemical’s Disccoat 4210 is a CLEAR water resistant, Optical Media Protective Coating, peelable temporary protective coating which has many applications. It may also be used to protect various types of surfaces during industrial processing. Disccoat 4210 air-dries quickly, leaving a tough, yet flexible coating that is easily removed from a variety of surfaces.
Disccoat 4210 represents the ultimate in solvent-based removable coating technology. It is stabilized against brittleness and is not softened or penetrated by most water-based compounds.

The two challenges that we have are non-standardized coating processes and material costs. Even though optical disc masking is guided by very rigid specifications, each facility may have its own method of protecting the finished product. Some plants do nothing other than store the nickel stampers in a plastic CD-type acrylic box, while others coat with either a Peelable vinyl resin or dry plastic film. For those using spin-coated vinyl films, there is no standardization for process cycles (like spin-coat speed, time, etc.) and processes may vary between equipment manufacturers, let alone in-house built machines.

The Disccoat 4210 film out-performs the dry plastic film. Applying no coating is cheap, but provides no protection. Disccoat 4210 has some real performance advantages, especially its ability to remove water-stains and moisture related defects. Moisture related defects, as measured by loss of electrical signal read-back of nickel electroforms, is reduced by 50%. This is significant since an optical nickel electroform cost between $50-75 to produce. A single application of 4210 at one of the world’s largest manufacturing facility, the world’s largest replicator of compact audio discs), restored environmentally damaged (oxidation) nickel stampers, cutting electrical signal loss in half.

Disccoat 4210is solvent based Optical Media Protective Coating and Peelable coating . Disccoat 4210 is international standard for protecting of optical media such as CD and video discs during manufacturing process. 4210 is very easy way to apply strippable coating for the protection of substrates from scratching and marring. Disccoat 4210is useful for substrate protection during polishing, handling and long term storage. 4210 is impregnated with transparent blue dye for easy visual inspection as well as identification and is non-staining and stable to 100 degrees Celsius.

Easily strippable Disccoat 4210 allows protection for any optical media such as CD or optical disc manufacturing process.

Optical Media

TDSCoscoat 4560ClearHighSolvent
TDSDiscoat 4210BlueLowSolvent
TDSDiscoat 4710BlackLowSolvent
TDSDisccoat 4220BlueLowWater Based
TDSPaintshield 5140ClearMediumWater Based
TDSStripaway 5900BlueMediumWater Based

Customer Comments

General Chemical’s water based and solvent based peelable coatings are fast drying Peelable coatings for Optical Media to protect it temporarily during Industrial process or in material handling.
“I am a manufacturing engineer responsible for production of precision optical components made of glass and a variety of IR materials. I am looking for a product which can be used to protect finished optical surfaces during subsequent processing of a lens. Ideally I would like a product which can be easily applied with a fairly uniform thickness (possibly by brushing it on) without significant equipment. I would like it to be quick drying, durable and water resistant. Additionally – I am looking for a coating which can be fairly easily removed once the optic is completed through the fabrication process. Do you have any products which would meet these requirements?”

Our Recommendations: Disccoat 4210, clear tinted blue and Stripcoat 4710, black, are solvent based peelable coatings that cure upon solvent evaporation to a tight water resistant film. Both products can be applied with brush, flow or dip. These coatings are removable by peel.



“We are looking for a protective coating for our ophthalmic lenses (plastic and acrylic) to protect the surfaces during processing and transportation. Ideally we would like a product which can be easily applied to the lens surfaces by either spraying or dipping, without significant investment in equipments. The product should be quick drying and can be easily removed without additional cleaning. Do you have a product that will meet our requirements?”

Our Recommendations: Disccoat 4220 is a water based peelable coating that peels very well from acrylic substrates. This product can be applied by dipping. For quicker drying, need to remove water by installing fans blowing warm dry air.


Optical Media Protective Coating Disccoat 4210 should be used as received. It is applied by airless spray, spinning, roll coating, or dipping. The sprayed coating dries to touch in 10 minutes or less, depending on temperature and film thickness. Disccoat 4210 should be applied to form a dry film in the range of 1 to 3 mil (.001″ to .003″) thick. Application temperature is ambient to no lower than 50°F, as drying times will be affected.
Spin Coating: Apply coating to center of substrate (quantity determined by size of area to be coated). Use a minimum of 300 RPM for approximately one minute to achieve one mil dry film thickness. Lower spinning speeds will require longer (in excess of 10 minutes) drying time.
Curing: Floor protection, floor coating and temporary protective coating
Disccoat 4210 will cure tack-free within 10 minutes after application. This is dependent upon temperature, humidity and thickness of coating. Deviations from application section will require adjustments in the curing times, as well as in the strip ability parameters.
Curing may be accelerated by forced drying at 110 degrees Fahrenheit for 3 to 7 minutes.
It is imperative that Disccoat 4210 be thoroughly cured and dry, with no solvent odor being emitted before an attempt is made to strip the coating from the substrate. Substrates should not be stored in airtight containers until the Disccoat 4210 is completely cured.

Storage: Floor protection, floor coating and temporary protective coating
Disccoat 4210 should be stored in the original shipping container with temperatures between 60 and 90 degrees F, in an explosion proof environment. Containers should be sealed until needed. Protection from freezing is necessary.

Removal: Disccoat 4210 is readily removed from surfaces by peeling.

Physical characteristics:
Color: Blue Tint
Weight: 7.6 lbs/gallon
Viscosity: 100 cps/77 degrees Fahrenheit
Flashpoint: 40 degrees Fahrenheit

Operating Guidelines:

  • Results in a reduction of labor costs.
  • Once cured, it provides an extremely tough, uniform film thickness.
  • Curing time can be cut considerably with the use heat lamps (100°F), circulation of air and other factors.
  • Curing time can be cut considerably with the use heat lamps (100°F), circulation of air and other factors.
  • Safe…non flammable
  • Suitable for all substrates including polycarbonates, plastic and painted surfaces


One liter will cover approximately 4 square meters at a dry film thickness of 100 microns. You can also use following chart to calculate in mil thickness and gallon coverage.Approximate Square Feet Coverage Per Gallon of General Chemical’s Peelable coatings:

General Chemical has a complete line of Peelable Masks to meet your challenging requirement. If we do not have something to meet your specific requirement, than we will develop it by working with you to meet that need for strippable coating.