Used in the process of making your own glue chipped glass. 1 lb. bag.
Instructions for Glue Chipping Glass
The Art of Glass Chipping Includes the Following Steps:
Preparation of the glass surface.
Pouring of warm animal glue solution upon the glass surface.
Gelation and preliminary air drying of glue film.
Oven drying of glue film and subsequent chipping of glass surface.
Finishing of chipped glass surface.
Lightly sandblast or etch the area of flat glass to be chipped.* Tape the outside edges of the sandblasted area with masking tape. *Pre-etched glass is also available.
Measure area of glass to be chipped and convert to square inches or square feet.
Prepare a 2-1 glue solution using Glass Pro Animal Hide Glue by soaking 1 part (by weight) dry glue in 2 parts (by weight) cold water for 1 hour. Then melt in jacketed container at 140-150°F. Let stand at this heat until reasonably free of air bubbles.
With glass at room temperature (70-80°F.), glue solution at 140-150°F., and glass plate perfectly level, pour sufficient glue upon glass to deposit 3 ounces of dry glue per square foot of glass area. (9 ounces of liquid glue as above prepared.)
Let glue solution gel firmly upon plate before moving same to preliminary storage for air drying.
Place plate in drying tunnel or chamber where a gentle draft of air at room temperature is blown across glue film. (70-80°F.) Let remain until glue film becomes tough and somewhat hard. (Glue film when tested with thumb nail should not cut, but should indent like hard rubber. Glue film will be quite clear – rather that cloudy.) NOTE: At this point, ratio of waste to dry glue in film will be approximately ½ to 1.
Remove to oven type dryer and dry at 125°F. After 4-8 hours drying on average, the glue film will pop off, chipping the surface of the glass, creating a moderately fine sized pattern.
Those particles of glue not popping off by themselves are scraped off by a blunt spatula or wooden board.
Masking tape is removed and glass washed to remove all traces of glass, glue, masking tape.
The above outline, while relatively simple to follow, is subject to a number of variations. To duplicate results on a production basis, particularly as to type of glass chipping pattern, it is essential that all steps of the process be under strict control. That such steps are difficult to control is obvious, particularly as to accurate control of the dry weight of glue deposited per square foot of glass, and the ratio of water to dry glue in Step 6 above just before glass with air dried glue film is transferred to oven for final drying. A discussion of the controls and variables is given below.
Glass:
The type of glass has a bearing on the relative ease of chipping. A hard, flint-like glass is impossible to chip with any uniformity of chipping, unless previously sandblasted. Some of the plate glasses will chip fairly readily without sandblasting, but sandblasting is recommended.
Glue Concentrations:
The weight of dry glue per square foot of glass is the primary control. From practical considerations, choose that ratio of water to dry glue to give a moderate viscosity to insure 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 3 ounces of dry glue per square foot of glass area by pouring methods, the minimum water to glue ratio is in the order of 2-1.
Glass Chipping Pattern:
The glass chipping pattern as to fine, medium, and heavy cuts and 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:
Glass – type, preparation of surface
Room Temperature.
Animal Glue – concentration; temperature at application.
Weight of dry glue deposited per square foot of glass.
Dryness of glue film at end of initial air drying just before placing in final dry oven.
Temperature of dry oven.
Physical Consideration:
Where a 2-1 glue concentration 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 3 oz. of dry glue per square 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 glue will seep under the tape and leave an uneven chipped borderline.
Glue Preparation:
Control the uniformity of the glue concentration at all times. Weigh out the dry glue and measure the cold water.
Melt glue, after preliminary soaking, in jacketed container, at 140-150°F. Do not boil the glue. Provide a thermometer for controlling the glue temperature.
Keep cover on glue kettle to prevent loss of moisture.
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