22K Yellow Gold

22K Yellow Gold

22K Yellow Gold

Technical Specifications

Tensile Strength : 303 Mpa

Elongation at Break : 20%

Modulus of Elasticity : 120GPA

Notched Izod Strength :18.9 J/m2

Compressive Strength : 89.6 Mpa

Rockwell Hardness : 90

Coefficient of Thermal Expansion : 18x10-6/K

Casting temperature : 1020 - 1020oC

Hallmarking

The hallmarking of gold is a way of guaranteeing that you’re getting the correct level of purity in your precious metals. We don’t use an assay office; instead, we have permission from the Royal Mint of Belgium to mark cast models with a master (also called a maker) and purity stamp. The purity mark will indicate the purity of the precious metal. For 14k gold, the mark is a diamond (or rhombus) with the text “au 585”. For 18k gold, the text “au 750” is featured in the same diamond shape.

The master or maker stamp has been registered and approved by the Royal Mint of Belgium. It displays the symbol of a lightbulb with the letters “i.m” inside the outline of a barrel.

Hallmarking is performed to the highest extent possible, either with a laser or by stamping the metal. However, if there is a risk of damaging the final product, the marks may be missing. In every case, you will always receive an invoice as proof of authenticity. Pursuant to the Belgian Law of 11 August 1987 on the warranty of works on precious metals and the Belgian Royal Decree of 18 January 1990 on the warranty of works on precious metals, imaginarium guarantees that the object of the Invoice fulfils the standards of purity for 14K gold at 58.5% purity or 18K gold at 75% purity, whichever is applicable.

For customers outside the EU, hallmarking is not provided.

3D Printing Process

Bronze models are fabricated using a complex five-step process. First, the model is printed in wax using a specialized high-resolution 3D Printer. It is then put in a container where liquid plaster is poured in around it. Once the plaster sets, the wax is melted out in a furnace, and the remaining plaster becomes the mold.

Molten bronze is poured into this mold and hardens quickly. The plaster is broken away, revealing your model. Raw Bronze is briefly tumbled. Polished Bronze is carefully cleaned and hand-polished. Please be aware that polishing can wear down very fine details and edges.

For interlocking parts, we connect each wax part with a sprue and then cut and polish the sprue away after casting.

Handling and Care

Like all bronze, our Polished and Raw offerings will tarnish over time and may need to be polished.

Pricing and Shipping

For Raw Finish:

Material per cm3: $14.00

Surface per cm2: $0.45

Minimum Price: $14.00

For products < 56mm, shipping will be done within 8 business days.

For products > 56mm, shipping will be done within 14 business days.

For Polished Finish:

Material per cm3: $14.00

Surface per cm2: $1.00

Minimum Price: $22.00

For products < 56mm, shipping will be done within 9 business days.

For products > 56mm, shipping will br done within 16 business days.

High Polished

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Matte

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Semi-Polished

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Tumble

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Raw

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Bounding Box

For us to be able to make a product, each of its pieces must fit within these dimensions.

For Bronze, the maximum bounding box is determined by the size of the printer we use to create a wax version of your product, as well as the limitations of the plaster mold it is cast in.

To ensure the successful creation of your product, make sure the bounding box fits within our maximum limit. If it does not, you can try scaling it down, removing unnecessary features to reduce the bounding box, or considering another material with a bigger maximum bounding box.

Max. Bounding Box for Raw and Polished Material: 89 × 89 × 100 mm

Min. Bounding Box for Raw and Polished Material: 2.4 × 2.4 × 0.6 mm

Wall Thickness

An unsupported wall is one connected to other walls on less than two sides.

For Bronze, the minimum unsupported wall is determined by our ability to successfully print your product in wax and then cast it in a plaster mold. Walls that are too thin may break in the mold-making process.

To ensure the successful creation of your product, make sure supported walls are thicker than the minimum requirement. If they are not, try making them thicker or adding supports.

Min unsupported wall thickness for raw material: 0.6 mm thick

Min unsupported wall thickness for polished material: 0.8 mm thick

A supported wall is one connected to other walls on two or more sides.

For Bronze, the minimum supported wall is determined by our ability to successfully print your product in wax and then cast it in a plaster mold. Walls that are too thin may break in the mold-making process.

To ensure the successful creation of your product, make sure supported walls are thicker than the minimum requirement. If they are not, try making them thicker.

Min supported wall thickness for raw material: 0.6 mm thick

Min supported wall thickness for polished material: 0.6 mm thick

Wires

A wire is a feature whose length is greater than two times its width. An unsupported wire is connected to walls on less than two sides.

For Bronze, the minimum supported and unsupported wire is determined by our ability to successfully print your product in wax, create a plaster mold, and then cast and polish the metal object. Wires need to be strong enough to not break during the wax printing and plaster casting process, and to allow metal to flow within the part during metal casting.

To ensure the successful creation of your product, make sure supported and unsupported wires are thicker than the minimum requirement. If they are not, try making them thicker, or consider a material with a smaller minimum supported and unsupported wire requirement. If you have bulky areas of a model connected by thin wires, these wires will need to be significantly thicker than the minimum to allow the metal to successfully flow within the model.

Min Supported wires for raw materials: 1.0 mm thick

Min Unsupported wires for raw materials: 0.6 mm thick

Min Supported wires for polished materials: 1.0 mm thick

Min Unsupported wires for polished materials: 0.8 mm thick

Engraving-Embossing

A detail is a feature whose length is less than twice its width. Engraved or debossed details go into a surface.

For Bronze, the minimum detail is determined by the casting process. Bronze products are printed in wax, and then a liquid plaster is poured around them and solidifies into a mold. When liquid metal is poured into this mold, the pieces of plaster that create engraved details can break off if they are too small.

To ensure details come out clearly, make them larger than the indicated minimum. We may refrain from printing products with details smaller than the minimum, since the final product will not be true to your design. If your product has details smaller than the minimum, try making them larger, removing them, or considering a material with finer detail.

A detail is a feature whose length is less than twice its width. Embossed details stick out from a surface.

For Bronze, the minimum detail is determined by the wax printer's resolution. When detail dimensions are below the minimum, the printer may not be able to accurately replicate them.

To ensure details come out clearly, make them larger than the indicated minimum. We may refrain from printing products with details smaller than the minimum, since the final product will not be true to your design. If your product has details smaller than the minimum, try making them larger, removing them, or considering a material with finer detail.

Min Engraved details for raw materials: 0.30 mm high & wide

Min Engraved details for polished materials: 0.35 mm high & wide

Min Embossed details for raw materials: 0.30 mm high & wide

Min Embossed details for polished materials: 0. 40 mm high & wide

Escape Holes

Escape holes allow unbuilt material inside hollow products to be removed.

To create Bronze products, a plaster mold is poured around a wax print of your product, and then Bronze is cast into the plaster mold. For products with hollow areas, escape holes are essential for two parts of this process. First, the liquid plaster must be able to enter the hole to fill in the hollow area. Then, once the metal is cast, the escape hole must be large enough to allow removal of the hardened plaster from the hollow area. If escape holes are too small, the hollow area may be completely filled in with metal or plaster.

To ensure the successful creation of your product, make sure the escape holes are large enough to allow the plaster to get in and out. Multiple holes make this process easier. If your holes are not big enough, you can enlarge them, add more, or fill in the hollow areas so they are solid. Positioning escape holes at the opposite ends of a product (one on top, one on the bottom) will help the finishing process.

A single escape hole at the end of a cavity will not allow material in the corners near the escape hole to fully escape. So we recommend multiple escape holes at both ends of the cavity.

Clearance

Clearance is the space between any two parts, walls or wires.

Bronze products are printed in wax, and then a liquid plaster mold is poured around them. If the clearance between features is very small, the plaster may not fully infiltrate the tiny gap. And if it does, a plaster wall that is too thin can break when the liquid metal is poured around it. Both issues can cause defects in your product.

To ensure the successful creation of your product, make the clearance between walls and wires greater than the indicated minimum. If your clearance is too small, try making the gap bigger, or consider fusing the features if their independence is unnecessary. You can also try a material with a smaller minimum clearance.

Sprues

2 mm thick, attached in at least 2 places per part

Sprues are wires that keep two models together. Sprues are more likely to break compared to other wires because they typically connect parts with high mass on either side. For this reason, they need to be thicker than our minimum wire thickness.

Interlocking and Enclosed parts

Nested objects (objects floating within another object), hinged parts, and interlinking parts, such as chains, cannot be made with lost wax casting. The reason is that support structures have to be removed before being cast in Gold.

Multiple Parts

We only allow identical parts for earrings and cufflinks. Multiple Rings, bracelets and necklaces or any other models are not permitted in one file.

Accuracy

For raw finishes rings the inner diameter will be 0.125 - 0.15 mm smaller than your design. On average, the model shrinks about 1.5% after casting and finishing. Scaling up your model by 1% will make your design closer to your desired size.

For polished finishes rings the inner diameter is accurate within +/- 0.1 to 0.15mm. On average, the model shrinks about 2.5% after casting and finishing. We do our best to polish the internal diameter to match your model file.

Design Tips

Print lines or "Stepping"

A "staircase" effect, or print lines, can occur on the surface of your print. These can become more pronounced on curved and angled surfaces.


Preventing Warping

Making your design more stiff (increasing torsional rigidity) will reduce the risk of warping. Longer walls need to be thicker than short ones.


Avoid "Spikes"

If your model has spike-like geometry where the spike is longer than it is wide, it’s possible for it to break in the cleaning process.


Finishing Color

Due to the inherent variability of the dyeing process, color may vary slightly between products. Avoid contact with water as it could wash off some of the color.


Orientation

Our production team does their best to evaluate your product and orient it to optimize either dimensionally accuracy or aesthetics depending on the application. Generally, the top surface will have more visible stepping than the bottom surface. The mating surface and other important features like holes are the most accurate when placed in the horizontal plane.


Holes & Small Holes

We cannot clean holes that are too small compared to their depth. Additionally, tubes with corners can be difficult to reach and we may not be able to fully clean your model.We recommend creating multiple access points to holes and small tubes so that we can properly clean your model.


Laser Lines

Our printers operate with two lasers at the same time. If a product in the printer is located in the overlap plane where the two lasers meet, miniscule calibration differences between the lasers may create a visible line on the surface of the product. We aim to arrange products in the printer away from the overlap plane. However, products larger than 33cm long in any direction may be too large to fit in one laser's area, so you may see a visible line along the overlap plane on your product.

High Definition


Since the resolution of the wax printing process is so high, make sure that you create your model and export your file with enough definition so you don’t see the triangles.

Geometery


Be careful when having large areas of your model connected supported by thin rods. Compare it to a big head resting on a thin neck. Ask yourself if the rods are strong enough to ‘carry’ the weight of the larger area. Also, internal structures are possible to print, but removing support structures, cleaning them and casting them can be difficult or even impossible.

Feature Size


The smallest features in your design should be at least 0.35 mm in diameter and 0.4 mm in height and attached to a solid surface. Details this small are suitable for delicate projects such as micro pavé settings.Because Silver is not a very strong material, longer features such as rods or prongs (in mesh-like structures) should be at least 0.8 mm in diameter. Otherwise, they might break during casting or even when you wear the piece.

Antique Models

Antique models are finished in 2 steps. First your model will be undergo an oxidation process: a sulfur mixture causes the silver to become duller and darker. Then, the elevated surfaces of your model are polished manually. Recessed or sunken areas are left untouched and therefore stay darker than the elevated, polished areas.

Minimal Dimensions of Sunken “Darker” Areas


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