Satin Cast 20 Investment
Instructions
Weigh the investment powder and measure the mix water at a ratio of 38 to 40 parts per
100 parts powder. (38 to 40 ml water per 100 grams of investment).
NOTE: Colder mix water temperature will increase working time, while warmer
temperatures will shorten working time. For best results adjust water temperature to 75- 85
degrees F (24-29 degrees C).
-Add the investment powder to the water.
-Using a spatula, mix by hand until the powder is thoroughly wetted.
-Using a mechanical mixer, mix on low speed for one minute, then on medium for an
additional two minutes.
-Place investment mixing bowl under a bell jar with a vacuum table pump down
capacity of 29 inches of mercury.
-Vacuum the investment slurry in the mixing bowl until it rises, the bubbles break and it
begins to boil vigorously. Continue to vacuum for one minute.
-Pour the investment down along the inside of the flask allowing it to flow up, around and
over the patterns leaving a minimum of ?" space at the sides and ½" at the top and
bottom.
-Place flask under vacuum and de-air for 1 ½ to 2 minutes.
As with all Gypsum bonded investments, keep all mixing equipment clean when
processing.
NOTE: Small amounts of set investment from previous mixes may accelerate the set time
of the mix, thus shortening the available working time.
-Top off flask with investment if needed and allow to sit undisturbed for a minimum of 1-2
hours.
-Remove sprue base.
-Load into burnout oven sprue end down.
-Follow general burnout cycle.
WATER/POWDER RATIO (W/P)= 39/100)
After the metal is cast and solidified, the investment may be removed by plunging the
hot flask into room temperature water or with a deflasking machine using a hydraulic
cylinder to push out the investment core.
PHYSICAL CHARACTERISTICS
Water/Powder 38 to 40/100
Working Time 9 min.
Set Time 12 - 14 min.
Green Crushing Strength @ 2 Hours 450 PSI
Set Expansion @ 2 Hours .55
*Contains no asbestos
Zero-D Products, Inc.
