Self Supporting Cones 06 Pack of 20

Description

06 Self Supporting Witness Cones -Pack of 25Self-Supporting Cones are the most accurate and easiest to usepyrometric cones available.They feature a built-in base for support during firing and require no cone holder or plaque. Correct height (1 ) and angle (8) are built in to help insure reproducible firings time after time.Self-Supporting Cones are popular as witness cones on the kiln shelf tovisually record and evaluate the heat work (the effect of temperature and time at temperature)in different locationsthroughout the kiln.Pyrometriccones are recommended by glaze and kiln manufacturers to assure the proper amount of heat work was achieved during firing. Achieving the proper amount of heatwork allowsthe optimum ceramic properties and colors tobe developed during the firing process.Pyrometric Cones willalso help identify any subtle changes taking place inside thekiln before theyimpact your ware (changes over time due to thermocouple drift, degrading heating elements, etc.).Thermocouples only measure temperature at one point inside the kiln. Pyrometric cones can be placed throughouttheware settingso you can easily monitor the heatwork your kiln produces whereyour product is being fired.3 cone method for monitoring heat-workPyrometric cones are slender pyramids made from about 100 carefully controlled compositions. Each cone number is unique in measuring temperature within a small temperature range (less than 30C). Cones measure the amount of heat absorbed. As the cone nears its maturing range, it softens and the tip begins to bend, drawn down by the influence of gravity.Pyrometric cones are useful in determining when a firing is complete, if the kiln provided enough heat, if there was a temperature difference in the kiln or if a problem occurred during firing.Cones are made from carefully controlled compositions and they bend in a repeatable manner (over a relatively small temperature range- less than 40F).Small (junior) cones are used in a Kiln-Sitter.Cone/Temperature Conversion ChartConeTemp at 108F/hrTemp at 270F/hrKiln ColorWare and Glaze Types1023452381WhiteStoneware Glaze923002336822802320722622295622322269Porcelain Bisque521672205421242161Porcelain Glaze3210621382208821271207921090120462080Yellow02201620520319872019041945197105188819110618281855Bisque,Low Glaze0717891809OrangeRed FamilyGlazes0817281753091688170601016571679011160716410121582162001315391582Red01414851540015145615040161422146501713601405Glass Sagging01813191353China Paints01912521283Metallics, Lusters02011591180Dull RedDecals02111121143Glass Paint02210871094