Decorative Glass Chipping - continued fron page #1

GLUE CONCENTRATIONS:

The weight of dry glue per square foot of glass is the primary control. From practical considerations, choose the ratio of glue to water to give a moderate viscosity to ensure easy, even spreading, yet heavy enough such that the glue film will set to a jell in a reasonable period of time at room temperature.
For depositing three (3) ounces of dry glue per square foot of glass area by pouring methods, the minimum dry glue to water ratio is one to two.

GLASS CHIPPING PATTERN:

The glass chipping pattern as to fine, medium, and heavy cuts/size of pattern is subject to a number of variables. The duplication and uniformity of each is dependent on rigid control of the variables.

These Are:
(1) Glass:
type, preparation of surface.

(2) Room temperature.

(3) Animal Glue -
concentration, temperature, at application.

(4) Weight of dry glue in water deposited per square foot of glass.

• Minimum practical amount of glue in water per sq. foot of glass is 1 to 1 1/2 ounces.

• 2 to 3 ounces of glue in water applied per sq. foot of glass will give a larger chip
pattern. (the results will vary by type of
glass and the other variables as listed here.)

(5) Dryness of glue film at end of initial air
drying just before placing in final dry oven.

(6) Temperature of dry oven.

***

CAUTIONS:

Wear safety glasses as the chips can come flying off the surface with some force.

SHARP CHARDS!!
The glass chips are EXTREMELY Sharp and the odor attractive to pets as the glue is an animal by-product. Handle the chips with care and dispose of the glass chards in a covered container.

PHYSICAL CONSIDERATIONS:

Where a one dry glue to two parts water is used, correct deposition of glue per square foot of glass area is obtained if a 1/16th inch thickness
of glue is applied. This is equivalent to approximately three ounces of dry glue per sq. foot of glass area.

Where a masking tape is used for out lining special areas, it is essential that the tape hold fast and flat at the borderlines. Otherwise, the wet glue will seep under the tape and leave an uneven chipped borderline.

GLUE PREPARATION:

(1) Control the uniformity of the glue concentration at all times. Weigh out the dry glue and cold, clean water.

(2) After preliminary soaking, heat the glue in a double boiler type jacketed container or glue pot. Do not boil, overheat, or use direct heat for the glue. Use a thermometer and monitor the glue to the 135°-145°F. recommended temperature.

(3) Keep a cover on the glue kettle to prevent loss of moisture.

*****

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