Determination of Fineness, Specific Gravity and Adhesion of Enamel Slurry
Release time:
2026-07-31 15:50
Source:
China Enamel Industry Association
1. Fineness Determination:
(1). Traditional Method
Take 50 ml (c.) or 100 c. of the enamel to be tested and pour it onto a 200-mesh sieve. Then wash it until no more clay or fine particles can pass through the sieve. Dry the sieve along with the residue. After drying, gently tap the sieve by hand until no more powder passes through. Weigh the powder; this is the fineness.
(2). Simplified Method (cone screen) (Bayer-method)
Fill a measuring ladle (approximately 12.5 c.) with the enamel and pour it into the sieve inside the conical tube using a funnel (with the bottom opening of the sieve facing upwards). Wash it until no more clay or fine particles pass through the sieve. Then, open the fine-graded tube and the conical tube, invert them, and let them stand. The residue will fall into the graduated tube. The graduation shown by the residue in the tube is the fineness.
2. Determination of Specific Gravity (S.G.)
Apparatus: A vessel capable of accurately measuring 50cc or 100cc of water.
Determination Procedure:
A: Weigh the vessel empty after it is dry.
B: Weigh it again after it is filled with enamel slurry.
S.G. = A - B / 100 or 50
3. Specific Gravity Adjustment:
The enamel slurry can be adjusted to the required specific gravity by adding water as follows.
E = D1 - D2 / D2 - 1 x V
E = D1 - D2 / D2 - 1 x W / D1
E = Required water volume
D1 = Current specific gravity of the enamel slurry
D2 = Desired specific gravity
V = Current volume of the enamel slurry
W = Current weight of the enamel slurry
4. Determination of Adhesion Weight (Adhesion weight)
Weigh a 10 cm x 10 cm (100 cm²) test plate, immerse it in the enamel slurry to be tested, and slowly withdraw it in a fixed manner. After the slurry is completely drained, weigh it again. The difference between the two weights is the adhesion weight value.
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