M-340

Very popular mid-temperature, smooth, plastic, semi-vitreous, native functional stoneware. Made from a combination of A3 and B stoneware materials (as are H-550 and L-212). Widely used in schools, by hobbyists, and professional potters. Compared to bodies made from refined industrial minerals, M340's diversity of ultimate particle sizes produces a body of much higher dry strength. Its parent materials are also highly consistent, pure, and free of foreign particles. In fact, even without grinding, 95% of a raw sample of M340 will wash through a 200 mesh sieve.

Characteristics:
Cone: 4-7
Wet Color: Grey
Fire Color
                Oxidation: Light Buff
Texture: Very Slightly Coarse
Average Shrinkage
                Oxidation Cone 4: 4,0-5,0%
                                  Cone 7: 5,5-6,5%
Average Water Absorption
                Oxidation Cone 4: 4,0-5,5%
                                 Cone 7: 1,0-2,0%
COE x 10-6: N/A

* Protect from freezing.