Technique using
Phosphate Investments
(FastFire 15)
• FastFire 15 is a fine grain phosphate investment which requires
only a 15 minute benchset before placing molds into a hot oven
for rapid burnout.
• It produces accurate, smooth castings using either the ringless
or metal ring technique.
• Optimum fit is achieved for all crown & bridge alloys through
dilution of the freeze stable FastFire Liquid.
• Available in bulk 20 lbs. (9kg) cartons or cases of 150-160g,
100-90g, or 50-180g preweighed envelopes.
The ringless casting technique using the 180 gram oval clear
plastic ring, sprue base and all-wax sprues and runner bars will
provide uniform expansion.
Pattern Preparation:
Attach sprue to the wax pattern using pliable sticky wax.
• Mount patterns on crucible former base.
• Spray with Whip Mix SMOOTHEX Wax Pattern Cleaner.
• Gently blow excess cleaner from pattern.
Preparation:
• Place metal or plastic ring
onto former base.
If metal rings are used:
• Line casting ring with a
ceramic or paper liner
positioned 6 mm short of
each end.
• Soak lined ring in water for
a minimum of one minute,
then shake excess from ring
before investing.
Suggested Liquid Concentrations
Alloy
Liquid
Concentration
16 ml: 60g
24 ml: 90g
27 ml: 100g
Base
(Ni-Cr, Ni-Cr-Be)
90%
14 ml liquid
2 ml water
21 ml liquid
3 ml water
23 ml liquid
4 ml water
Noble
(Ag-Pd,
Au<40%)
75%
12 ml liquid
4 ml water
18 ml liquid
6 ml water
20 ml liquid
7 ml water
High Noble
(Pd w/2-8% Au,
Au>40%)
60%
10 ml liquid
6 ml water
14 ml liquid
10 ml water
16 ml liquid
11 ml water
Recommended concentrations are approximate and can be adjusted
to optimize fit. To increase expansion, use more liquid and less
water. To decrease expansion, use less liquid and more water.
Always maintain total liquid/water volume.
• Use separate mixing bowls for phosphate and gypsum investments.
• For best results, keep the liquid and powder at room temperature of about
15-24°C (60-75°F)
• When using bulk packaging, reseal container to avoid investment
breakdown.
• Rinse the bowl out with water and shake out excess.
• Add measured liquid to mixing bowl.
• Incorporate powder by hand spatulation 10-15 seconds.
• Mechanical mix under vacuum, slow speed (350-450
rpm) for 60-90 seconds.
Fill casting ring using low vibration, covering wax patterns
with no less than ¼” (7mm) investment.
Benchset 15 minutes, then remove mold from ring and base.
-When using 60 grams or less, benchset for 30 minutes.
Trim glaze off top of mold and rinse under tap water.
Molds allowed to set more than 24 hours should be re-wet by
soaking in water for 3-5 minutes.
Place molds in pre-heated oven at metal manufacturers’
recommended temperature (maximum of 1650°F). For higher
temperatures, place molds in oven at 1650°F, then heat to final
temperature at 25-40°F per minute.
Heat soak at final temperature for 30 minutes, adding ten
minutes for each additional mold. Cast according to alloy
manufacturer’s instructions.
Break investment from metal framework/castings.
Clean castings according to
alloy manufacturer’s
suggestions. Prepare metal
for porcelain application
utilizing a separating disc
and non-contaminating
aluminum oxide abrasives.
Completed castings on the master model ready for porcelain.
Physical Properties:
Liquid/Powder Ratio
27 ml/100g
Initial Setting Time
7-9 minutes
Setting Expansion
1.0%
Thermal Expansion
1.0%
Compressive Strength,
Wet (45 minutes)
500 psi (3.4 Mpa)
Measured at 100% liquid concentration.
361 Farmington Avenue
P.O. Box 17183
Louisville, Kentucky 40217 USA
Phone: 502-637-1451 • Fax: 502-634-4512
www.whipmix.com