Hygrade Casting will be closed from 20th December 2024 and re-opening again 20th January 2025. Merry Christmas & Happy New Year!
Hygrade Casting will be closed from 20th December 2024 and re-opening again 20th January 2025. Merry Christmas & Happy New Year!
We specialise in lustrous, strong, dense, and porosity-free castings from precious metals, crafted to perfection.
We’ve abandoned outdated business practices and casting methods in favour of complete transparency and cutting-edge technology, ensuring flawless results. Our services cater to high-end jewellery retailers, workshops, dental clinics, and individuals who demand professional casting services without unnecessary complications.
We’ve trained under some of the most experienced precious metal casting technicians from Australia, Germany, Switzerland and Turkey. But we didn’t stop there, we've refined those methods to be able to provide premium quality precious metal castings.
We use state-of-the-art German made casting machinery, sparing no expense on quality. Flasks are held under vacuum pressure whilst melting metals in a Argon positive atmosphere, the result is metal that does not undergo oxidating during the melting and casting phase as gas porosity is eliminated.
Once metal is casted, the flaks then undergo vibration during the liquidous to solidus phase at a very specific frequency resulting in:
The result of the casted parts overall means they have better tension and elastic properties making them easier to process due to better formability, which in high volume environments can translate a reduction of post-processing time of up to 25%.
We formulate and granulate our very own master alloys in house and use the highest purity available precious metals at five 9’s (99.999%) sourced from Australian bullion suppliers and non-precious base metals such at four 9’s (99.99% purity) sourced both locally and overseas.
The following precious metals are sourced directly from Australian bullion suppliers who deal directly with various Australian mines:
The following precious & base metals are sourced directly from the suppliers in Europe (who deal directly with European mines).
We don’t use Rhodium (Rh), Gallium (Ga), Iridium (Ir), Nickle (Ni), Tin (Sn) or Silicon (Si) as they as they compromise the integrity of high-quality castings.
At Hygrade Casting, quality is everything. We use the finest investment powders available on the market, distilled water and use the absolute best investment mixing equipment from Germany and Italy.
Our proprietary 14-hour burnout cycle ensures complete wax elimination and a clean, ash-free mould, delivering precise, high-quality castings. We reject rapid burnout cycles that compromise the final product.
By precisely controlling flask temperatures, casting pressures, and quenching times, we eliminate common defects such as miscasting, porosity, scorching, and brittleness. Every step of our process is optimised for perfection and precision.
You’ll receive castings that are clean, bright and have strong tensile strength with a very tight grain structure. All of our castings are hypoallergenic, meaning they’re safe for wear (rings, earrings, pendants, etc.) as we refuse to use base metals like nickel and gallium.
Our high-end clientele values quality and precision over price and speed, so we focus on a select range of premium metals to ensure the best quality castings.
18 Karat Premium White Gold
(13% Palladium)
9 Karat Premium White Gold
(7% Palladium)
18 Karat Premium Yellow Gold
9 Karat Premium Yellow Gold
18 Karat Premium Rose Gold
9 Karat Premium Rose Gold
Ultra 925 Silver (5% Palladium)
We will be introducing 14 Karat gold in Q4 of 2025 and we no longer cast regular 925 silver.
Tuesday – Friday (we prep castings on Monday).
Your casting will have either a single main sprue (the main feeder) that is 4-10mm in length and 3-4mm in diameter, furthermore depending on the design, multiple flow gates may be required. This metal is part of your casting, which you will be invoiced for. See our 3D wax printing page for a better understand and drawings.
You’re welcome to supply your own castable waxes (injection wax, hand-carved wax, wax-printed items).
We no longer accept customer supplied resins as we refuse to cast resin.
The table below provides an approximate conversion from wax weight to final metal weight after casting. Please note that this table is not 100% precise, as minor fluctuations can occur during casting — particularly due to the slight burn-off of zinc. As zinc is lost, the gold concentration increases, which can occasionally raise the final karat by 0.01–0.05 and result in a marginally heavier item. We have intentionally overcompensated in the gravity conversion values to account for this effect
|
Precious Metal Type |
Approximate Gravity Factor |
|
18 Karat Premium White Gold (13% Palladium) |
16.70 |
|
9 Karat Premium White Gold (7% Palladium) |
13.50 |
|
18 Karat Premium Yellow Gold |
16.10 |
|
9 Karat Premium Yellow Gold |
11.80 |
|
18 Karat Premium Rose Gold |
15.60 |
|
9 Karat Premium Rose Gold |
12.00 |
|
Ultra 925 Silver (5% Palladium) |
11.30 |
If your wax model weighs 0.35 grams and is to be cast in 18 Karat Premium Yellow Gold, the calculation would be:
0.35g (wax) × 16.10 (18K yellow gold gravity) = 5.63g of 18K yellow gold required.
Please also allow for additional wax used in the form of sprues. Depending on your design, we may need to attach extra sprue material to ensure correct positioning on the casting tree and to prevent breakage during the investment and pouring process.
After casting, we trim the main sprue as close to your piece as possible using industrial pneumatic cutters. However, a small section of the sprue — usually around 5–10 mm in length — will remain attached to your item. This remaining metal becomes part of your final casting and is therefore included in the weight you are invoiced for, unless you opt for our de-sprue service (available for an additional fee). This service allows us to remove and retain the sprues and flow gates ourselves, so you're only invoiced for the finished piece.
For examples of sprue and flow gate design, please see our 3D Wax Printing page linked above.
We do not buy back or credit precious metal castings, including sprue cut-offs or scrap, as we do not entertain this business practice.
We do not offer metal buybacks or credits, as we focus exclusively on precision casting services. In the rare case of a defect, we will require to be notified of the fault or defect within 48 hours of you receiving your castings, we will then require the item sent back to us for assessment, once the items are back in our hands we can then refund/credit you what you where invoiced for.
