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Common Sense Warning when using ADVANCER® Shelves in Electric Kilns

Under certain circumstances ADVANCER® NSiC silicon carbide may act as an electrical conductor. Therefore, care should be taken to avoid direct element contact with shelves when using ADVANCER® shelves in electric kilns.  For users of top loading, hobby and production kilns, it is important to place shelves so that they are centered properly within the kiln maintaining a gap between the shelf and the interior kiln wall and element grooves.  Use only the appropriate size shelf for your specific kiln model.  ADVANCER® shelves should not be used in kilns that are in poor repair with unpinned elements protruding out of their grooves.  In any case, observe common sense rules and do not reach hands into an electric kiln unless it is turned off. This will eliminate the hazard of electrical shock from any source within the kiln. Consult an application specialist for more detailed information.

WARNING

Storing and Drying Requirements for ADVANCER® Refractory Components

ADVANCER® (silicon nitride-bonded silicon carbide) refractory components should be stored in a dry, enclosed area.

ADVANCER® refractory components exposed to prolonged moisture penetration may result in catastrophic failure (i.e., steam explosion) during any rapid heat-up process of the kiln. Accordingly, do not expose ADVANCER® refractory components to any prolonged moisture source including rain, snow, condensation, etc.

The application of kiln washes and coatings on ADVANCER® refractory components is an acceptable practice and is not considered a source of prolonged moisture.

If any ADVANCER® refractory components are exposed to prolonged moisture, the product must be completely dried before it is used at temperatures exceeding 212ºF (100ºC). As a general guideline for the drying of ADVANCER® refractory components, the product must be held slightly above the boiling point of water for a sufficient length of time to expel any moisture and as much steam as possible. The following is a recommended drying cycle for ADVANCER® refractory components exposed to prolonged moisture.

1. Heat from ambient to 210ºF (99ºC) at a rate of 50ºF (28ºC)/hour.
2. Slow heating rate to 25ºF (14oC)/hour to 230ºF (110ºC).
3. Hold at 230ºF (110ºC) for 12 hours ensuring that the entire load has reached the soak temperature before the timing of the soak has begun.
4. Raise temperature to 350-500ºF (177-260ºC) at a rate of 100ºF (56oC)/hour.
5. Hold soak temperature for 16 hours ensuring that the entire load has reached the soak temperature before the timing of the soak has begun.
6. Cool naturally/slowly by turning off the heating source.

Call an Application Engineer for further questions regarding moisture-related issues with ADVANCER® refractory components.


ADDITIONAL WARNING – To prevent the hazard of electric shock from any source within an electric kiln, ADVANCER® kiln shelves should not come into direct contact with electrical heating elements.