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Clay - Firing and Handling PMC+ & PMC3 Silver Clay

Material Safety Data Sheets (MSDS) are available on CD-ROM's in PDF format. Please call 1-800-431-6067 for more details. A CD-ROM disk can be enclosed with your order upon verbal request.

Firing PMC+ and PMC3 Silver Clay
The PMC pieces should be completely dried. This can be dried in the open air or dried with a heat source such as a hair dryer, heating tray or similar device. To verify that a piece is completely dry, place it on a shiny metal surface such as a piece of aluminum foil or the inside of the lid from a candy tin. Leave the piece on the metal for several seconds and then remove it. Look on the metal for a ghost, a water vapor mark which is present if the piece is not completely dry.

A second method is to hold the piece against your cheek. The skin on your face is sensitive to temperature. If the piece is not completely dry, it will feel cool against your cheek.

When the piece is completely dry, fire it according to the applicable table.

PMC+ and PMC3 consists of fine silver particles suspended in an organic binder with water. When fired in a kiln or with a torch, the binder burns off, leaving a 0.999 fine silver piece. The PMC+ sheet contains no water and feels like a sheet of vinyl. It has a long shelf life and is highly resistant to drying. In both instances, shrinkage is about 10%.

PMC+ Silver

Temperature Hold Time
1650 F (900 C) 10 minutes
1560 F (850C) 20 minutes
1470 F (800 C) 30 minutes

PMC3 Silver

Temperature Hold Time
1290 F (700 C) 10 minutes
1200 F (650 C) 20 minutes
1110 F (600 C) 45 minutes

PMC & Other Materials
PMC+ and PMC3, work well with a wide range of other materials. Of particular interest is use of glass and ceramic materials with PMC+ and PMC3. When using these materials in combination, always remember to use the firing schedule which applies to the most sensitive material being used.

Thus, if using PMC+ with glass, the glass is the more sensitive material. Therefore, we recommend that the firing use a slow ramp (increase in kiln temperature) of about 1500 F per hour to the lower PMC+ temperature (1470F) for 30 minutes. This temperature will result is a complete fusing of the glass into a rounded cabochon.

If it is desirable to retain surface dimension to the glass, we recommend the use of PMC3 and the higher PMC3 firing schedule (1290F for 10 minutes). Even here, however, is it appropriate to use a slow ramp (increase in kiln temperature) of 1500F per hour.

As always when firing glass, remember to guard against devitrification and thermal shock. We recommend a crash cool (rapid decrease in kiln temperature) from the hold temperature to 1000F, then a natural slow cooling period to room temperature.

One of the wonderful aspects of PMC+ and PMC3 is the low level of waste. Both products, can be reconstituted by the introduction of small amounts water if they become dried. Even after firing, you can place additional clay, in any of the four forms, onto a piece which requires additional work and re-fire the altered piece. You can repeat this process many times with no adverse effects on the piece. The materials are very forgiving and allow the user a great deal of flexibility in completing the final design.

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