Caldera-X Blank Extension Collar

Uses:  China Painting    Decals    Glass Fusing    Glaze Testing    Low-Fire Ceramics    Silver Clay  

The Caldera-X collar is a kiln section that stacks onto the Caldera or Caldera-S kiln, adding 4 ½” of height. The Caldera-X has no heating elements. It is designed to add extra space for low-fire projects such as glass slumping. The Caldera and Caldera-S, even with a  blank collar, still fire to 2350F.  The Collar is made of 2 ½” hand-selected insulating refractory firebricks.

To strengthen the firing chamber, the firebrick corners are fitted together with L-shaped notches. This type of joint lasts longer than the butted joint and the "picture frame" mitered joint found on competitive brands. Rugged construction makes this collar a workhorse. The insulating firebricks, wrapped in heavy-gauge stainless steel, soak up heat for slow, efficient cooling. For easy maintenance, the stainless steel case includes case tighteners.