Mayco’s Stoneware Casting Slip is generally buff in color and vitreous at cone 6. Suitable for use in microwaves and dishwashers, pieces that are meant for long-term use are cast with stoneware slip because of its strong durability. Shrinkage: 14 1/2% ± 1% @ C/6. Absorption: <1 1/2% @ C/6. Slip is regularly tested using Mayco and competitor’s glazes for fit and performance; no shivering or crazing has been observed. Glazes designed to produce crackle patterns do so flawlessly. Mayco’s Stoneware Casting Slips are AP certified and conform to ASTM-D4236.