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EMS 1146, Protective Coating for Laser Scribing, is a polymer solution which is applied over a substrate, yielding a film which protects the surface of the substrate from debris resulting from laser scribing. After laser scribing, the polymer is cleaned from the substrate with a water spray or by dipping in water.

EMS 1146 may be applied by spinning, dipping or spraying. Spun-on films ( spin time: 20-30 seconds at 3000 rpm) are ready for use; dipped or sprayed films may require some heating at 35 - 50o C for 15-20 minutes in air to dry them.

Physical Characteristics
Density.......1.0 - 1.3 gm/cm3 @25o C
Viscosity.....7.2 cp @25o C

Metallic contaminants in the solution are limited as follows:

Na < 1 ppm Cu < 1 ppm
K < 1 ppm Mn < 1 ppm
Ni < 1 ppm Zn < 1 ppm
Fe < 1 ppm

Film Characteristics

a. Thickness
Films applied by spinning at 3000 rpm for 20 seconds exhibit a thickness of 3000 angstroms; lower spin speeds will yield thicker films. The thickness varies inversely as the square root of the spin speed. If thicker films are desired for spin applications, higher viscosity solutions are available at no extra cost. Films applied by dipping or spraying will exhibit thicknesses in excess of 10,000 angstroms.

b. Index of Refraction
The film exhibits an index of refraction of 1.50.

c. Thermal Properties
Heating the films above 100o C will reduce the rate of dissolution in water. At 200o C the film decomposes readily yielding H20 and CO2. Heating at 200o C or higher in air may be used to remove the film if water washing is not desirable.

d. Optical Properties
Films of EMS 1146 are clear and transparent so that one may view the substrate structure under the film. Light transmission of the film is illustrated in Table I.


Light Transmitted by Films of EMS 1146

Wave Length % Transmitted
2500 angstroms 78%
3000 angstroms 73%
4000 angstroms 80%

In the infrared, from 15 to 5 microns, the film is nearly opaque.

e. Adhesion
Films of EMS 1146 will adhere to most surfaces such as silicon, alumina and other ceramics, steel, etc., without special treatment. For unusual surfaces which prove difficult to wet, special formulations are available.

f. Solubility
Films of EMS 1146 are not soluble in organic solvents such as trichlorethylene, toluene, benzene, the higher alcohols, MEK, etc. The films may swell in ethanol or methanol. The most practical solvent for EMS 1146 films is water, in which the films dissolve and leave no residue. Hot water will dissolve the films more rapidly than cold water. Strong oxidizing acid solutions will dissolve the film (e.g., H2O2+ H2SO4 or fuming nitric acid).

g. Storage
EMS 1146 is stable indefinitely at room temperature and is not affected by light. The solution is essentially non-flammable.

h. Safety
As far as is known, EMS 1146 is a non-hazardous solution requiring no special handling precautions. However, as with all laboratory chemicals, due caution should be exercised in its use.

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