1-800-431-6067

Click Here for Newsletter Archives
Sign up for Our Bi- Monthly Newsletter with Specials

Enter Email Address:
 

For Email Newsletters you can trust

Kiln Supplies - Cones - Orton - Pyro Bar, Junior, Large, & Self-Support

SUMMER SALE

Important Facts About Cones
A pyrometer measures temperature only; Cones measure the effects of time and temperature (called “Heat Work”). A cone number is a measurement of this Heat Work. The temperature listed on a cone chart is the temperature at which that cone deforms when heated at a specific rate. If the rate is changed, the temperature will change. This is why a pyrometer reading may not always appear to match your cones. If a discrepancy occurs during a firing between a pyrometer readout and a cone deformation, always follow the cone. Clays and glazes are formulated to mature at specific cone numbers. When a manufacturer labels a glaze to fire at cone 05, it means that in order to mature, the heat work required to deform an Orton Large Cone 05 must be done. Witness Cones are the only way to measure this heat work. When a manufacturer refers to a witness cone number, they are referring to a large or self-supporting Orton Cone. (Junior Cones are not used as witness cones).


Using Witness Cones
To use witness cones, select 3 cones as follows:

  • A Guide Cone - One cone number below your goal.

  • A Fire Cone - The cone number you wish to achieve.

  • A Guard Cone - One cone higher than your goal.

Place standard large cones in a holder or cone plaque designed to hold them at the proper eight degree angle. If using self-support cones, their special built-in base will place them at the correct angle. Place cones in order: Guide\Fire\Guard. (For example, to fire to cone 05, place the cones facing left 060504). This allows each cone to melt without interfering with the others. Cone plaques should be visible through your kiln’s spy holes during firing so that you can monitor your progress and manually shut down if automatic devices should fail. Additional cone plaques can be placed in other areas of the kiln for analysis after firing is completed. They will tell you if your kiln fires evenly throughout or where your hot and cold spots are.


Cones and Kiln Sitters or Controllers
A Kiln Sitter is a valuable shut-off device, but should not be considered the determining factor with reference to proper heat work. The cone in the sitter has additional variables that affect its melt: proximity to the kiln wall and elements and the weight of the sensing rod resting on it. When a Junior Cone is used, the tapered shape can cause variances if positioned too far right or left. (We recommend Bar Cones to eliminate this variable). Because of these other factors, a kiln sitter cone can deform prematurely, shutting down the firing before proper heat work is complete. Visual cones will tell you if this happens and adjustments to the sitter can be made if necessary.

Programmable Controllers are much more accurate than kiln sitters if you pay attention to your ramp rates - especially toward the end of the firing. By following the heating (ramp) rate on Orton’s Cone Chart for at least the last 90-120 minutes of firing, you can be fairly certain that the degree temperature equivalent on the chart will be the end point of your firing. Even so, only visual cones will confirm your heat work and allow you to adjust your firing profile if necessary.

Use witness cones in every firing: Both Kiln Sitters and Controllers can fail due to mechanical malfunction. In either case, properly using witness cones will insure that you don’t experience a serious melt-down. Cones are cheap; kilns are not.

Please note: We carry Orton Cones because only Orton maintains the highest standards of quality control in the testing and production of their cones. Orton is known industry-wide as the leader in temperature measurement and control. Cones are crucial to successful firings of your valuable work - don’t take chances with cheaper brands. Orton Cones are the best!


"Cones should always be used in groups of at least three in sequence in the desired heat range... "

Pyrometric Cone Temperature Equivalents
Cone Large Cones Self-Supporting Cones Small*
  Heating Rate °F/Hour (last 90-120 minutes of firing)
108° 270° 108° 270° 540°
022 N/A N/A 1087 1094 1166
021 N/A N/A 1112 1143 1189
020 N/A N/A 1159 1180 1231
019 1249 1279 1252 1283 1333
018 1314 1350 1319 1353 1386
017 1357 1402 1360 1405 1443
016 1416 1461 1422 1465 1517
015 1450 1501 1456 1504 1549
014 1485 1537 1485 1540 1598
013 1539 1578 1539 1582 1616
012 1576 1616 1582 1620 1652
011 1603 1638 1607 1641 1679
010 1648 1675 1657 1679 1686
09 1683 1702 1688 1706 1751
08 1728 1749 1728 1753 1801
07 1783 1805 1789 1809 1846
06 1823 1852 1828 1855 1873
05 1886 1915 1888 1911 1944
04 1940 1958 1945 1971 2008
03 1987 2014 1987 2019 2068
02 2014 2048 2016 2052 2098
01 2043 2079 2046 2080 2152
1 2077 2109 2079 2109 2163
2 2088 2124 2088 2127 2174
3 2106 2134 2106 2138 2185
4 2120 2158 2124 2161 2208
5 2163 2201 2167 2205 2230
6 2228 2266 2232 2269 2291
7 2259 2291 2262 2295 2307
8 2277 2316 2280 2320 2372
9 2295 2332 2300 2336 2403
10 2340 2377 2345 2381 2426
11 2359 2394 2361 2399 2437
12 2379 2415 2383 2419 2471
*(the column for "small Cones" covers both Juniors and Bars)

Orton Cone Prices

Description

List Price

Sale Price

Orton Self-Supporting Cones -
2-1/2" H (Box of 25)

$8.40

$7.14

Orton Large Cones -
2-1/2" H (Box of 50)

$11.80

$10.03

Orton Junior Cones -
1-1/8" H (Box of 50)

$8.50

$7.31

Orton Pyro Bar Cones -
(Box of 50)

$10.00

$8.40

Cone Styles

PYRO BAR

JUNIOR

LARGE

SELF-
SUPPORT

General Notes & Ordering Instructions:
Cones number 022, 021, & 020 not available in Large Style. Cones number 11 & 12 not available in Pyro Bar Style. Please enter a quantity of units (1 unit = box of 25 or 50 cones depending on style) and then select Cone No./Part No. before clicking "Add to Cart" button to order.

Orton Self-Supporting Cones -
2-1/2" H (Box of 25 = 1 unit)

Enter Qty.

Select Cone No./Part No.

 Add to Cart

Cone No.:

Orton Large Cones -
2-1/2" H (Box of 50 = 1 unit)

Enter Qty.

Select Cone No./Part No.

 Add to Cart

Cone No:

Orton Junior Cones -
1-1/8" H (Box of 50 = 1 unit)

Enter Qty.

Select Cone No./Part No.

 Add to Cart

Cone No:

Orton Pyro Bar Cones -
(Box of 50 = 1 unit)

Enter Qty.

Select Cone No./Part No.

 Add to Cart

Cone No:

Orton Cone Use & Interpretation Info | Click Here for Cone Plaques, Wire Cone Holders, Kiln Wash,
High Temp Wire, Element Pins and Staples

TOP | MASTER INDEX

 

© 2014 Bailey Pottery Equipment Corporation