EZ960® Sterling Silver Paste - 15 gram

EZ960® Sterling Silver Paste

Fire open shelf on a raised hard ceramic kiln shelf at 1675°F / 913°C - 2 hours, full ramp. No carbon required.
Shrinkage: 10-11%
Torch firing is not recommended.

This is the first sterling silver metal clay that comes right out of the package ready to form, fire and finish with no two part mixing and no carbon required.
Invented by Bill Struve from Metal Adventures, the inventor of BRONZclay™ and COPPRclay™.

EZ960 is a great, all purpose metal clay with excellent working properties. Because the clay is a sterling silver alloy, one of its best attributes is its post firing strength, in comparison to fine silver. This inherent strength makes EZ960 the perfect choice for jewelry that takes lots of abuse, such as rings and bracelets. It is also great for jewelry with findings and components such as bails, hinges and clasps, as well as delicate pieces that would benefit from the strength of sterling silver.

EZ960 Sterling Silver in slip/paste form ready to use - no need to thin lump clay to a thinner consistency. Ideal for adding details and findings to your designs, making repairs, adding parts and pieces in the wet stage, greenware and post firing. Also use to paint on leaves, sticks and botanicals to create and re-create natural designs. Embed findings and gemstones with EZ960 paste.

Click here to view or download the EZ960 Sterling Overview & Firing Guide.

Wet Clay

Ready to use directly from the package, the 1st thing you will notice is its smooth, creamy consistency. The clay takes texture with excellent clarity. It does not distort or stretch when removed from a mold, nor is it prone to tearing. It is easy to roll and form, and is surprisingly non-sticky. It also has a high moisture content, making it easy to work with in its wet form, as it stays workable and pliable without drying and cracking when forming, texturizing or molding. For best long term storage and to maintain hydration and workability, store unused EZ960 in a clay hydrator charged with distilled water.

Silhouette Paper Cutter

EZ960 clay, when rolled to 1 or 2 cards thick, cuts like a dream on the Silhouette paper cutter.

Greenware and Dry Construction

In its dried, greenware stage, EZ960 is easy to sand, file and carve. Dried pieces are quite flexible, less delicate and less fragile. This is a plus when fitting parts and pieces or when handling, assembling or manipulating your greenware. Making paste for assembly of pieces and parts is easy… simply add a few drops of distilled water to a small amount of clay to create your desired consistency. If necessary, EZ960 drills easily in its greenware state, and is not prone to cracking, chipping or other issues.

Embedding Objects

Nano Gems, Cubic zirconia, lab created gemstones, bezel cups and other findings or embeddables can be co-fired with EZ960. Please refer to our Gemstone Firing Guide for a comprehensive list of gemstones that are compatible with the firing times and temperatures of EZ960. Most, but not all, CZs and lab created gemstones can be fired at 1675°F / 913C for 2 hours on an open kiln shelf (see Firing Schedule below) without failure or color change. Nano Gems can be co-fired on an open shelf safely with EZ960 up to 1700°F for 4 hours without risk of failure or color change.

Glass or dichroic gems are not compatible with the firing schedule of EZ960 and must be set after firing.

Firing

Torch firing is not recommended. After ensuring the clay is bone-dry, fire on a open shelf raised above the kiln floor at full ramp speed at any of the times and temperatures below:

Note: If firing in carbon, we recommend using Magic Carbon. The proper temperature and time for firing in carbon is 1590°F for 2 hours.

• 1675°F / 913°C - 2 hours
• 1700°F / 927°C - 1 hour
• 1725°F / 941°C - 15 minutes (Note, it is important to create a test piece at this temperature.)

For low temperature kilns:

• 1650°F / 899°C - 4 hours
• 1625°F /885°C - 4 hours
• 1600°F / 871°C - 8 hours

Note: If bending post firing, we recommend:
Stage 1: full ramp to 675°F / for 15 minutes to allow for binder burn out
Stage 2: full ramp to 1675°F / 885°C, for 3 or 4 hours, as not all kilns are accurately calibrated. An additional one or two hours of "soak" time ensures complete sintering.

If firing large quantities, we recommend removing the vent plug on the top of the kiln to oxygenate the firing chamber. This will ensure adequate oxygen to allow for the proper burn out of the binders in the clay.

If firing a piece flat, we recommend using a raised, hard ceramic kiln shelf, lightly dusted with alumia hydrate to prevent sticking as the metal clay shrinks and sinters. For irregular pieces, fire in a kiln safe container such as an open stainless steel firing pan or a ceramic dish filled with alumina hydrate. We do not recommend using a fiber blanket, cordierite or fiber board kiln shelf as these may stick to EZ960 during firing. Vermiculite is an excellent firing media for irregular shapes, but should be crushed to a very small, fine consistency prior to firing. Course vermiculite, combined with the high temperatures in a kiln may cause the clay to "take on" or telegraph the shape of the vermiculite in the fired piece. Fire items directly from the kiln may be slightly grayish in appearance. This is normal for an alloy of this type.

Note: Muffle kilns have heating elements on three sides (no heating element in the door), therefore any air leakage around the door can create cool spots near and around the door. For this reason, to ensure complete sintering, we recommend firing all metal clays in the rear center portion of the kiln.

Firing in Carbon

Shrinkage

During firing, EZ960 will shrink 10% to 11% as a result of the sintering process, as the organic clay binders burn off in the kiln. This relatively low shrink-rate, combined with the inherent strength of Sterling, makes EZ960 an excellent candidate for rings and bracelets, delicate items, or other jewelry that may be subject to heavy wear.

Finishing and Polishing

When finishing, EZ960 provides either an easy satin finish, or, if you like, a beautiful mirror finish.

For a satin finish, steel brush your piece directly out of the kiln, followed by 1 to 2 hours in a rotary tumbler. A magnetic tumbler will drastically reduce the time needed in a tumbler.

For a mirror finish, use the same process as above. Then, using a flex shaft or other rotary tool, polish with radial bristle discs and, lastly, silicone polishing wheels and points.

Enameling

When enameling over silver, most enamelists choose fine silver as a base, as it does not require depletion guilding prior to firing enamels. Having said that, after firing, EZ960 can be enameled, however results are not identical to fine silver. Despite being a sterling alloy, it does not require depletion guilding prior to enameling when using opaque enamels, and will provide good results. Transparent enamels can also be used, however, some color distortion or cloudiness may occur due to copper oxides in the alloy. We recommend depletion guilding prior to using transparent enamels. For all enamels, the prep work, firing sequences and firing schedules are the same as with fine silver. Choose EZ960 for accent enameling or the use of opaque enamels on rings, bracelets, or wherever an alloy or additional strength is desired.

Patination

To achieve a good, dark result from Liver of Sulphur (LOS), Patina Gel or Black Max, ensure your piece is clean by soaking and then brushing with hot water, soap, and ammonia. Using a strong solution of LOS in very hot distilled water, dip or soak your piece in the solution until you get the darkness or result you desire. Adding a teaspoon of ammonia to your LOS bath can also help achieve a darker result or, possibly, a rainbow effect. A bath of baking soda and water will neutralize the LOS bath and halt the patination process. Then, either by hand or by machine, bring up the high points with a polishing cloth, Scotchbrite™ pad (satin finish), or polishing wheels (high shine or mirror finish).

Soldering

Once fired, EZ960 is metallurgically just like other sterling silver metals, but, like other fired metal clays, it is more porous than sheet stock or cast items. Due to this porosity, EZ960 will “soak up” solder. When possible, prepare areas for solder by burnishing to close the open pores and reduce the tendency to absorb solder. Join other metals and findings to fired EZ960 by using the same flux, solder and torch(es) as you would to solder other silver products or gold.

Hallmarking

Hallmark as .960 or Sterling.