Clay Terms 1 Vocabulary - Basics Clay a wet mixture of silica and alumina and fillers – Slip a thick watery mixture of clay used to decorate or join – Glaze a glassy finish for ceramics made from silica – Vocabulary Stages of Clay – Greenware dry clay that has not been fired – Leatherhard clay that is dry enough to stand up but can be cut, carved and – bent Bonedry chalky, dry clay that is ready for the kiln – Bisqueware clay that has been heated in the kiln, all water has been – removed Glazeware clay that has a coating, usuall it has been fired twice – Vocabulary Properties of Clay – Plasticity how easy the clay is to work, holds form well – Workability how easy the clay is to manipulate – Porosity how much water the fired clay sucks up in a set amount of time – Vitrification how hard the clay gets when fired – Vocabulary Mixing Clay – Silica a element present in clay – Alumina an element present in clay – Mixing putting different types of clay together – Contamination other non-clay materials that will burn out in the kiln – Purity how clean the clay body is – Grain how gritty the clay is, effects how smooth you can make it – Vocabulary Firing Clay – Cone Temperature how hot the kiln gets – Kiln an enclosed oven that heats to a high temperature for ceramics – Fire heating the clay to a certain temperature in a kiln – Bisque the first firing, normally a lower temperature – Glaze Firing usually the second firing, higher temperature and more – precautions taken Clay Terms 2 Vocabulary The Medium – Elasticity see plasticity; how easily the clay can be stretched and put back – together Shrinkage how much smaller the clay get after drying and firing – Grog coarse particles added to a clay body to reduce shrinkage and aid even – drying a hand technique for removing air in clay – Vocabulary - Throwing Throw to form clay on a spinning wheel by centering and pulling up on the – clay a device used to spin clay; for throwing – Center to manipulate the clay it is in the center of the wheel head –
Clay Terms 1 Vocabulary - Basics Clay – a wet mixture of silica and alumina and fillers Slip – a thick watery mixture of clay used to decorate or join Glaze – a glassy finish for ceramics made from silica Vocabulary – Stages of Clay Greenware – dry clay that has not been fired Leatherhard – clay that is dry enough to stand up but can be cut, carved and bent Bonedry – chalky, dry clay that is ready for the kiln Bisqueware – clay that has been heated in the kiln, all water has been removed Glazeware – clay that has a coating, usuall it has been fired twice Vocabulary – Properties of Clay Plasticity – how easy the clay is to work, holds form well Workability – how easy the clay is to manipulate Porosity – how much water the fired clay sucks up in a set amount of time Vitrification – how hard the clay gets when fired Vocabulary – Mixing Clay Silica – a element present in clay Alumina – an element present in clay Mixing – putting different types of clay together Contamination – other non-clay materials that will burn out in the kiln Purity – how clean the clay body is Grain – how gritty the clay is, effects how smooth you can make it Vocabulary – Firing Clay Cone Temperature – how hot the kiln gets Kiln – an enclosed oven that heats to a high temperature for ceramics Fire – heating the clay to a certain temperature in a kiln Bisque – the first firing, normally a lower temperature Glaze Firing – usually the second firing, higher temperature and more precautions taken Clay Terms 2 Vocabulary – The Medium Elasticity – see plasticity; how easily the clay can be stretched and put back together Shrinkage – how much smaller the clay get after drying and firing Grog – coarse particles added to a clay body to reduce shrinkage and aid even drying – a hand technique for removing air in clay Vocabulary - Throwing Throw – to form clay on a spinning wheel by centering and pulling up on the clay – a device used to spin clay; for throwing Center – to manipulate the clay it is in the center of the wheel head
ceramics_vocab_list.docx