Earthstone Clay ES 20 Smooth Textured 100 KgEarthstone Clay ES 20 Smooth Textured Available in 25 Kgs bags. Minimum order 100 Kgs. ES 20 is a particularly versatile clay which matures between 1180C 1280C and fires off white. ES 20s low shrinkage means that it is highly resistant to warping, cracking and thermal shock. ES 20 is particularly suited to throwing large pieces and the addition of specially selected molochite means that it is also excellent for hand building, slab building and