• Meet ASTM Methods of Test
  
• Qualify Under ANSI/NCSL Z540-1 or
  
• MIL-STD-45662A as Applicable
  
• Conform to ISO 9000 When Ordered With Calibration Certification

Weight per Gallon Cups are used to quickly and accurately determine the weight per gallon, and also the specific gravity of paints, lacquer, pastes, semi-pastes, and other liquid or semi-liquid materials.

Until the middle of 1989, GARDCO weight per gallon cups were fabricated using Series 300 Stainless Steel for the sidewall and the easier machined but less corrosion resistant Series 400 Stainless Steel for the base and cover. Now, with the installation of state-of-the-art computer controlled metal cutting machinery, these cups are machined from Series 300 Stainless Steel solid bar stock.

1. Determine the weight of a clean cup in grams. As an alternative, the cup may be supplied with an accurate tare weight for use with two-pan laboratory balances. Note: Do not interchange tare weights between cups as each cup and tare weight is matched.
   
2. Remove cover and fill to within 1.7mm of rim with material to be tested.
   
3. Carefully replace cover so that the air and excess material is expelled through vent.
   
4. Wipe over cover to remove surplus and reweigh. By subtracting the original weight of the cup, the weight of the contents will be found. If a tare weight was used at the start, the balance will show the weight of the contents. Clean thoroughly immediately after use.
   
5. By comparing a water sample at a temperature listed in the chart below verification of cup accuracy can be determined.

Comparative results on different materials measured in the same cup are accurate to within the limits of accuracy of the balances used. Comparative results between cups may be somewhat improved by determining a cup factor as follows: Divide 83.205 by gram weight of water at 25°C (77°F). Example: if the cup actually holds only 83.000 grams, divide 83.205 by 83.000 which equals 1.0025. Multiply all cup readings by this factor of 1.0025. In the same manner if the cup holds 83.400 (grams) divide 83.205
by 83.400 which equals 0.9977. Multiply all readings by this factor of 0.9977.

13th Edition Paint Testing Manual by Gardner/Sward, Part 3, Physical Properties Chapter 3.1, Sect. 3.1.3 Weight Per Gallon. (A.S.T.M., 1916 Race St., Phila., PA 19103). FTMS 141c, Method 4183 “Specific Gravity of Solvents and Thinners”. FTMS 141c, Method 4184.1 “Weight Per Gallon”. ASTM D 333 “Testing Clear Lacquers and Lacquer Enamels”. ASTM D 1475 “Density of Paint, Varnish, Lacquer and Related Products”. ASTM D 2205 “Traffic Paints, Recommended Practices for Testing”. ASTM D 2614 “Hiding Power of Chromatic Paints”. ASTM D 2805 “Hiding Power of Paints”. ASTM D 244 “Emulsified Asphalts”, ASTM D 1875 “Density of Adhesives in Fluid Form”, ASTM D1875 “Standard Test Method for Density of Adhesives in Fluid Form”.

Machined from solid stock, this extremely lightweight cup (less than 50 grams) is formed from high-tensile aluminum 6000 series alloy which combined with alodined coating provides great strength with lightness.

Even when filled with a heavy pigment paint the total weight is well within the capacity of a 250 gram laboratory balance. Dimensions of the 83.2 cup are approximately 45 cm. wide by 57 cm. high.