Refractory clays are those materials that can withstand high temperatures before weakening, warping or melting. Normally, by 'high temperatures', we mean somewhat beyond those typically employed for firing stonewares (1150-1300C). Super duty refractories are made from non-clay materials and can, of course, withstand much higher temperatures.
Plainsman has produced fireclays for many years, even some of our regular stoneware and sculpture clays rival the heat duty of common fireclays. Our fireclay is a blend of refractory ball clay, kaolinized sand and kaolin. While fireclays are known for lack of consistency (perhaps notoriously so!), our material is consistent because it is a blend and because the parent materials themselves are consistent over time. To see a Plainsman Fireclay data sheet, click here.
Tapper clays are employed to plug the drain hole in ladles used to melt batches of metals during refining. Although a typical dried clay will fracture in seconds if exposed to an open flame, wet clays of sufficient aggregate content can withstand open flame without problem. Tapper clays must, of course, also be refractory, low in plasticity and shrinkage yet still have sufficient pliability to flow properly upon injection, have low water content and, as mentioned, have the correct distribution of aggregates to provide maximum channeling of water and steam. We have the flexibility to work with your production department to adapt our existing tapper mixes to your application. You will also find that our prices for these products are lower than others and if your location is in our area, much much lower due to savings in freight. Also, remember, Plainsman service and flexibility is second-to-none. We have data sheets for Tapper II and Tapper V.