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Herador® G - for C&B
High gold content ceramic bonding alloy acc. to EN ISO 9693-1 and 22674, light yellow
Benefits
- Gold content 82.8 mass % (precious-metal content 99.0 mass %)
- Suitable for single crowns and bridges with one unit
- Palladium free
- Many years of user experience
- Ideal composition with only four alloy components
Indications
- Crowns
- Small bridges
Specifications
| Product details | ||||||||||||||
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Composition (content in mass %) |
Au 82.8 Pt 16.0 In 1.0 Ir 0.2 |
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Type (Classification acc. EN ISO 22674) |
4 (v/k) s= self-hardening alloy after slow cooling in the mould v= Condition after hardening k= Bonding alloy: condition after ceramik firing |
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| Shade | light yellow | |||||||||||||
| Indication |
Crowns Bridges |
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| Article Code | 1510 0000 | |||||||||||||
| Technical data, melting and casting | ||||||||||||||
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| Melting range(1) |
Solidus 1130 °C Liquidus 1200 °C |
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| Preheating temperature | 900 °C | |||||||||||||
| Casting temperature | 1350 °C | |||||||||||||
| Crucible | Graphite | |||||||||||||
| Density(1) | 19.4 g/cm³ | |||||||||||||
| Hardness, HV5 |
w/k 150 v 190 s 120 |
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| 0.2% proof stress(1), MPa(2) |
w/k 370 v 480 |
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| Elongation(1) % |
w/k 11 v 9 |
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| Elastic modulus (1), GPa(2) | 95 | |||||||||||||
| Ceramic firing | ||||||||||||||
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| CTE | 13.9 | |||||||||||||
| Oxide firing |
880°C(1) 5 min. vacuum - yes |
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| Soft annealing | --- | |||||||||||||
| Processing after oxide firing | Sandblasting with 125µm Aluminium Oxide | |||||||||||||
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Cooling after ceramic firing (Relexation cooling is recommended for lang span, bulky frameworks) |
HeraCeram: Rapid cooling At the end of the programm the firing platform is completely and firing tray with objects is removed emediately. The firing tray can cool next to the furnace on a fire-resistant tray. Others: Follow the instructions of the ceramic manufacturer. |
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| Hardening |
500 °C 15 min. |
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| Solder / Laser welding wire | ||||||||||||||
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| Prior to Ceramic Firing | ||||||||||||||
| Solder | Herador Lot | |||||||||||||
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Herador 1060 S Lot Working temperature °C: 1060 / Solder colour: yellow |
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| After Ceramic Firing | ||||||||||||||
| Solder | Herador/Maingold PFLot | |||||||||||||
| Flux** | Work. temp.* 800°C / Solder colour: yellow | |||||||||||||
| Alloy also available as Laser welding wire | ||||||||||||||
| Ø 0.5 mm x 200 mm | - | |||||||||||||
| Ø 0.3 mm x 200 mm | + | |||||||||||||
Specification legend
Composition:
w = After soft annealing and quenching
k = Bonding alloy: condition after ceramic firing
v = Condition after hardening
s = Self-hardening alloy, after slow cooling in the mould
Remarks
A = A stable framework design with reinforced connections with a cross-section of 8 –10 mm2 is required for long span bridges and suprastructures. Additionally, the frameworks need to be hardened.
B = Depending on the copper and/or silver content, in some cases discoloration of double crowns may result after short period of wearing.
C = In exceptional cases these alloys can also be used for traditional telescopic crowns with parallel walls and for the bar casting technique provided that cross-sections for crown walls, approximal areas, bars and laser welded joints are particularly thick and the alloy is hardened subsequently. No indication for conical crowns and shear distributors.
D = Type classification acc. EN ISO 22674
Technical Data, Melting and Casting:
Contraindications
In case of hypersensitivity (allergies) to one of the constituents of the alloy.
Side effects
In individual cases hypersensitivity reactions (allergies) or electrochemically conditioned, local malsensations were reported.
Interactions with other dental alloys
With approximal or antagonist contact with dentures of different alloys galvanic effects may occur. Other materials must be used instead if contact with other alloys causes persistent local paraesthesia on an electrochemical basis.
1) Acc. to EN ISO 22674
2) 1MPa = 1N/mm², 1GPa = 1000 N/mm²
3) When veneered with ceramics, these alloys do not require any additional hardening process to provide their max. physical values.
4) Normally, the pre-heating temperature shall be 900 °C. In case of form filling problems with thin copings we recommend to raise the pre-heating temperature to 950 °C.
5) For cast-on technique
Ceramic Firing:
Remarks
1) When veneering with ceramics with higher firing temperature, oxide firing must be carried out at the highest ceramic firing temperature; max. temperature of 950 °C must not be exceeded.
2) Oxide firing: Please follow the instructions of the ceramic manufacturer.
3) Follow the instructions of the ceramic manufacturer.
4) Hardening prior to firing (conditioning for milling techniques): 930 °C, 15min, rapid cooling.
5) When veneered with ceramics, these alloys do not require any additional hardening process to provide their maximum physical values.
6) 25 – 500 °C acc. EN ISO 9693
Solders / Laser Welding Wires:
Remarks
* The working temperature is part of the solder’s name.
** Recommended flux:
Precious metal/ precious metal: use suitable flux
Precious metal/ non precious metal: use suitable flux
Non precious metal/ non precious metal: use suitable flux
1) Herador Lot V800 must be soldered under vacuum. Graphite firing trays should be used.
2) Recommended alternative alloy.
3) When processed with HeraCeram.
5) Accurate temperature control must be ensured. 740 °C must not be exceeded. Maximum heat-rate: 55 °C/min.