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ARRO ROSENSON
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Arobond

Arobond is a chromium-cobalt non-precious ceramic alloy that provides maximum porcelain bonding. It is compatible with major porcelains, including Vita. Arobond contains no nickel or beryllium. No bonding agent is required. Helps produce thinner frameworks. It is easily cast, soldered & polished to a high luster finish. It is much softer and easier to cut and grind than other non-precious ceramic alloys. Comes close to the precious ceramic alloys in handling.
 

MAJOR COMPONENTS
 
Nickel & Beryllium Free (SOFT)
COBALT = 59.5%
NOMINAL CHROMIUM = 31.5%
NOMINAL MOLYBDENUM = 5.0%
NOMINAL SILICON = 2.0%
NOMINAL MANGANESE = < 1
IRON = < 1
CARBON = < 1 
 
PHYSICAL PROPERTIES OF AROBOND CHROME COBALT CERAMIC ALLOY

Melting Range = 2145-2460°F (1175-1350°C) Casting Temperature = 2695°F (1480°C) Density = 8.8 g/cm3
Yield Strength = af=103,000 psi (710 MPa) Elastic Modulus = af=280 GPa
Elongation = af=5%
Vickers Hardness = af=430
Co-Efficient of Expansion @ 500°C = 14.3 x 106
Co-Efficient of Expansion @ 600°C = 14.8 x 106
 
af=after firing

INDICATIONS FOR USE:

AROBOND CHROME COBALT CERAMIC ALLOY is a Cobalt- Chromium based alloy acceptable for use in
fabrication of dental prosthetics and reconstructions.
Rx Only
 
 
TECHNICAL INSTRUCTIONS

MODELING: Maintain a minimum wax thickness of 0.3 to 0.4 mm. The wax
pattern design should have lingual collars and no sharp corners. Lingual eyelet rings help support castings during firing.
SPRUING (Single Crowns): Use direct sprues, 8-10 gauge, (3.3-2.6 mm diameter) and 1/2 in. (12 mm) long with adequate reservoirs. There should beno more than 1/4 in. (6 mm) of investment from the top of the pattern to the top of the investment.
SPRUING (Multi-Units & Bridges): Use a 6 gauge (4.1 mm diameter) runner bar, connect- ing the units to the bar with 10 gauge (2.6 mm diameter) sprues1/8 in. (3 mm)long and joining the bar to the sprue base with 8 gauge (3.3 mm diameter) and 1/2in. (12 mm) long sprues coming from a domed central entry point. There should be no more than 1/4 in. (6 mm) of investment from the top of the pattern to the top of the investment.
INVESTING: Use debubblizer and blow off any excess before investing.
Recommended Investment: Phosphate Bonded. Follow the manufacturer’s instructions. BURNOUT: After adequate set-up time, place the ring(s) in a room
temperature oven and raise the temperature to 1600°F (870°C) plus 10 minutes for each additional ring. If you are using a rapid fire investment, follow the manufacturer’s instruc- tions.
CRUCIBLE TYPE: Quartz or Zircon
TORCH CASTING: Wind the casting machine one more turn than you would for precious ceramic alloys. A quartz or zircon crucible is necessary. Use a propane/oxygen torch with
a multi-orifice tip. Do not use flux. Place the alloy (at least 50% new metal) in a pre-heated crucible. Keep the torch moving to heat all the metal in the crucible at an even rate. The individual ingots will not pool together to form a single mass. Do not stir or rupture the oxide surface. When the flame appears to move the alloy, cast. After casting bench cool before devesting.
INDUCTION OR ELECTRICAL CASTING: When using induction casting machine, pre-heat the crucible. Set the arm speed to 400-450 rpm & set the power to high and be sure that the alloy is pulsating and slumping. The casting temperature of automatic casting equip- ment should be set for 2695°F (1480°C) with a five seconds heat soak.
COOLING: Allow casting ring to cool to room temperature. DO NOT quench in water. DIVESTING & CLEANING: Divest and sandblast with 50 micron aluminum oxide, be careful of margins.
FINISHING: Grind the metal surfaces for porcelain application with non-contaminating aluminum oxide stones in one direction. Blast with non-recycled 50 micron aluminum oxide. Do not exceed a blast pressure of 4 bars or 60 psi. Clean in distilled water in an ultra- sonic cleaner for 10 minutes.
OXYDIZING OR DEGASSING: 1200-1800°F (650-980°C), Hold 0 min with Vacuum, Removal of oxide optional.
PRE-SOLDER: Solder joints should be as large as possible (at least 5 mm2). Soldering gap approximately 0.05-0.2 mm. The solder joints should be parallel and free of debris. Preheat invested units and pressure blast with 50 micron just before soldering. Use: Co/Cr Pre PORCELAIN APPLICATION: Follow the recommendations of the porcelain manufacturer. For a better bond, fire a thin wash 10 - 15°F (10°C) above normal temperature, followed by regular opaque coats.
POST-SOLDERING AFTER FIRING: Solder joints should be as large as
possible (at least 5 mm2). Soldering gap approximately 0.05 - 0.2 mm. Cover ceramically-veneered units with wax before investing. The soldering investment
should not come in contact with the ceramic. The soldering surfaces should be
parallel, smooth and free of debris. Use: LO, R
LASER WIRE: LWNPCO
POLISHING: Use Tripoli and rouge or other similar products.