Doncaster Tel: 01709 770801

Simba Materials Limited t/a

CTM Potters Supplies Co Reg No 05659119

   Doncaster Fax : 01709 770803

doncaster@ctmpotterssupplies.co.uk     Unit 8 Broomhouse Lane Industrial Estate, Edlington, Doncaster DN12 1EQ

Delivery charges and VAT will be added on to all orders. Prices on this website and in all downloads are net of VAT. Prices are subject to change without notice.

Exeter Tel: 01395 233077

   Exeter Fax : 01395 233905

admin@ctmpotterssupplies.co.uk            Unit 19 Hogsbrook Units,Greendale Ind Estate EAST, White Cross Road, Woodbury Salterton, Exeter EX5 1PY

All prices are in GBP - often per kg - and need delivery and VAT to be added. For some items there are pictures or more information if you press on the link. You can order by email, phone, fax but but you cannot pay online - please see ORDERING

Please Note

Orton Pyrometric Cones

For props, stilts, extension props, batts, shelves, tile cranks, bead firing stands, support, nichrome wire, t/couples, pyrometers, blankets, mortar etc - go to REFRACTORY/FIRING

We do strongly advise the use of pyrometers, controllers and thermocouples as they are much more accurate in their use. However, where you are unable to do so, or are needing to compare the relative difference in “heat work” in different areas of a kiln,

Orton Pyrometric Cones and Bars are a useful tool.

The cones and bars are made out of a refractory material designed to bend at different temperature ranges but based on the “heat work” that they have reached.

What this means is that the bending is a function of the “temperature reached” and of “the rate of increase in temperature” within the last 100oC of reaching the target temperature that particular cone has been designed to bend at.  

So for example a 05 cone bends at 1030oC at a rate of 60oC per hour, 1038oC at 100oC per hour, 1046oC at 150oC per hour or 1062oC at 300oC per hour.  But as it is a function of heat and time it will also bend if soaked - a 05 cone can bend at 1010oC if reached there very slowly and is then soaked for over an hour.

Once it starts to bend it can take 25-30 minutes to fully bend - it bends slowly at first - in the picture below the first cone started bending at 1250oC, second cone is 25 minutes later at 1277oC and the third cone is a further 6 minutes later at 1282oC so you can see the large difference in bend between the second and third cone is only 5oC ! - Cone 10 at 60oC phr.

Each grade is a slightly different colour for identification purposes and made in pairs - you need to split them before using them. They come as a box of 50 of one grade - we can sell in 10’s but you need to make that clear when ordering.

If you intend to use cones in a very fast firing kiln - 250-300oC per hour - please calcine the cones first - fire them up to 400oC

BROWSE - RING or EMAIL

We will price it up for you. Pay over the phone or you can do a bank transfer!

We do not stock all temperature grades

Please Please Please be clear in which size, grade and quantity you want

We do not stock all temperature grades

Please Please Please be clear in which size, grade and quantity you want