Precious Metal Dental Gold Type I
ASTM ADA Spec No.5 Type I · ISO 1562 Type 1
Dental Gold Type I is a soft, low-hardness high-gold casting alloy to ADA Specification No. 5, Type I, used for low-stress cast restorations.
Reference datasheet — Dental Gold Type I is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the AC condition
Dental Gold Type I tempers and conditions
Dental Gold Type I is supplied in 3 conditions, soft to hard. AC is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Softened / homogenised | Pick when maximum ductility for margin burnishing and stress-free adaptation is wanted. | 80 | 230 | 35 | 52 HB | 24 % IACS |
ACDefault Spheroidize annealed | Standard condition of a lost-wax cast inlay; adequate strength with full burnishability. | 90 | 250 | 30 | 60 HB | 25 % IACS |
Cold worked | Condition of the burnished margin or of drawn wire/foil forms; strength raised at the cost of ductility. | 180 | 300 | 8 | 90 HB | 24 % IACS |
What is Dental Gold Type I?
Dental Gold Type I is a soft, low-hardness high-gold casting alloy to ADA Specification No. 5, Type I, used for low-stress cast restorations. Its 90 MPa yield strength, 250 MPa tensile strength, 30% elongation and 60 HB hardness give the ductility needed to close inlay margins by burnishing rather than machining, and it is supplied as casting ingot with soft and cold-worked wrought conditions on file. The trade-off is strength: it is unsuited to crowns, bridges or heavily loaded occlusal work and is rated to about 300 °C. Type II or Type III are used when higher load capacity is required. Dental Gold Type I has a density of 17.2 g/cm³ (0.621 lb/in³), heavier than 86% of precious metal grades. It melts at 935°C (1,715 °F). Dental Gold Type I has a yield strength of 90 MPa (13.1 ksi) and a tensile strength of 250 MPa (36.3 ksi) — weaker than 86% of precious metal grades. Elongation at break is 30% and the elastic modulus is 85 GPa (12.3 Msi).
What is Dental Gold Type I used for?
- Dental inlays
- Low-stress single restorations
- Non-load-bearing occlusal inlays
- Burnishable cast margins
- Cast restorations for small cavity preparations
Advantages
- Polishes to a fine finish — 98/100, better than 98% of precious metal grades
- Forms and bends easily — 96/100, better than 95% of precious metal grades
- Good corrosion resistance — 96/100, better than 85% of precious metal grades
Limitations
- Low strength — 90 MPa (13.1 ksi), worse than 86% of precious metal grades
- Heavy — 17.2 g/cm³ (0.621 lb/in³), worse than 86% of precious metal grades
- High embodied carbon — 13,000 kg CO₂/kg, worse than 81% of precious metal grades
Dental Gold Type I properties
Typical room-temperature values for Dental Gold Type I-AC; bars are the position among precious metal grades.
Physical3
Dental Gold Type I has a density of 17.2 g/cm³ (0.621 lb/in³), heavier than 86% of precious metal grades. It melts at 935°C (1,715 °F).
Mechanical12
Dental Gold Type I has a yield strength of 90 MPa (13.1 ksi) and a tensile strength of 250 MPa (36.3 ksi) — weaker than 86% of precious metal grades. Elongation at break is 30% and the elastic modulus is 85 GPa (12.3 Msi).
Thermal6
Dental Gold Type I is rated for continuous service to 300°C (572 °F). It conducts heat at 115 W/m·K (66.4 BTU/hr·ft·°F), better than 61% of precious metal grades. Thermal expansion is 16 µm/m·K (8.89 µin/in·°F).
Electrical3
Dental Gold Type I conducts electricity at 25 % IACS, better than 64% of precious metal grades.
Chemical & Environmental3
Corrosion resistance is excellent (96/100), better than 85% of precious metal grades.
Sustainability4
Producing a kilogram of Dental Gold Type I takes about 190,000 MJ of energy and emits 13,000 kg of CO₂ — more than 81% of precious metal grades. Typical recycled content is 60%.
Manufacturability8
Dental Gold Type I's machinability is fair (40/100, worse than 60% of precious metal grades); weldability good (60/100); formability excellent (96/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the precious metal family
Yield strength against density for every precious metal grade FabDigit runs. Dental Gold Type I is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Dental Gold Type I
Is Dental Gold Type I easy to machine?
Very gummy and smearing — use sharp, high-rake carbide or HSS burs, light cuts, high speed, and capture all swarf for refining.
Can Dental Gold Type I be welded?
Laser or micro-plasma spot welding works well in dental labs; conventional fusion welding is rare — gold-based solders are the norm.
Can Dental Gold Type I be formed, bent or molded?
Cast by lost-wax investment casting at roughly 1000–1050 °C into a gypsum-bonded investment; wrought forms cold-work readily with intermediate anneals near 700 °C.
Dental Gold Type I chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| AuADA Spec No.5 Type I: gold + PGM ≥ 83 % | 83 – 90 | 86 |
| Ag | 3 – 12 | 8.5 |
| Culow Cu — little order-hardening response | 2 – 6 | 4 |
| Pd | 0 – 1.5 | 0.5 |
| Pt | 0 – 1 | 0.3 |
| Zndeoxidiser, improves casting fluidity | 0 – 1.5 | 0.5 |
| Irgrain refiner | 0 – 0.01 | 0.01 |
What surface finishes work on Dental Gold Type I?
Polishes to a mirror finish with rouge and does not need plating or coating; margins are closed by burnishing rather than by machining.
Equivalent designations
Standards and trade names that resolve to Precious Metal Dental Gold Type I in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- ADA Spec No.5 Type I
- ISO
- 1562 Type 1
How much does Dental Gold Type I cost?
Dental Gold Type I is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Dental Gold Type I — frequently asked
What is Dental Gold Type I used for?
Dental Gold Type I is typically used for dental inlays, low-stress single restorations, non-load-bearing occlusal inlays, burnishable cast margins and cast restorations for small cavity preparations. In short: softest dental casting gold; best burnishable margins; low-stress restorations only.
What is the yield strength of Dental Gold Type I?
Dental Gold Type I has a typical yield strength of 90 MPa (13.1 ksi) and a tensile strength of 250 MPa (36.3 ksi) — weaker than 86% of precious metal grades. Strength varies by condition: see the 3 listed tempers.
Is Dental Gold Type I easy to machine?
Not especially — machinability is rated fair (40/100, worse than 60% of precious metal grades). Very gummy and smearing — use sharp, high-rake carbide or HSS burs, light cuts, high speed, and capture all swarf for refining.
Can Dental Gold Type I be welded?
Yes — weldability is rated good (60/100). Laser or micro-plasma spot welding works well in dental labs; conventional fusion welding is rare — gold-based solders are the norm.
What surface finishes work on Dental Gold Type I?
Polishes to a mirror finish with rouge and does not need plating or coating; margins are closed by burnishing rather than by machining.
Can Dental Gold Type I be formed, bent or molded?
Cast by lost-wax investment casting at roughly 1000–1050 °C into a gypsum-bonded investment; wrought forms cold-work readily with intermediate anneals near 700 °C.
What is the maximum service temperature of Dental Gold Type I?
Dental Gold Type I is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Dental Gold Type I-AC and Dental Gold Type I-CW?
AC is the default condition — standard condition of a lost-wax cast inlay; adequate strength with full burnishability. CW: condition of the burnished margin or of drawn wire/foil forms; strength raised at the cost of ductility. Yield strength is 90 MPa in AC versus 180 MPa in CW.
How much does Dental Gold Type I cost?
Dental Gold Type I is a high-cost precious metal ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ISO 1562 Dentistry — Casting gold alloys — ISO (2004)
- ANSI/ADA Specification No. 5 — Dental Casting Alloys — American Dental Association (2018)
- Craig's Restorative Dental Materials — Elsevier (2019)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys (Precious Metals) — ASM International (1990)
- Dental casting gold alloy datasheets (refiners/alloy makers) — various (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.