hello student today we are going to learn types of mouldings and use in pounds of sand in different conditions and having different uses first what is gives and the scent in moist condition wet condition is known as Vincent it is a mixture of silica sand with 18 to 30 percent clay moisture 6 to 8 percent that clay and water give binding capacity to the jeans and it possesses good plasticity and can be give any safe it is used for casting simple small or medium-sized molds medium sized mold cavity Vincent thus and in its natural more or less moist state is called Vincent the mold mold cavity prepared with this sand are called give sand mold the metal molten metal is poor indigent sand mold without any pile baking without any PPS baking or dying okay Vincent is fine soft light and porous okay next what is dice and when moisture from Vincent when water or moisture from Vincent has been removed by heating in a dying Obon is known as dice and the dice and mold papaya mold prepared by dice and health data strength naivety and thermal stability dice and is used mainly for production of large and heavy casting dice and sand from which all the fee and uncombined moisture has been removed usually by heating in a dying Obon is known as dice and dice and is used mainly for production of large custom or where dimensional accuracy and soundness of casting are particularly important ok now what is facing sand the sand which is used against the face of a pattern and which form the piece of a mold is called pissing sand ok it should have high strength and high refractoriness as it comes in contact directly with the heated molten metal okay it is made of silica sand and clay without the addition of USand that means without the addition of previously usand different form of carbon is used to prevent the metal from burning into the sand okay a layer of passing sent in a mold ranges from 20 to 30 millimeter okay the sand use piercing of the mold is called piercing sand facing sand it comes in contact directly with the molten metal therefore it must possesses high strength and refractoriness different passing materials such as graphite molasses molasses means made from sugar cane etc are used okay now what is baking sand it is used on the back of the piercing set in a mold old repeatedly use molding sand is merely employed for this purpose okay it is black in color due to the addition of coal dust and due to action of molten metal on the sand baking sand is sent used to back up the missing sand and not use next to the pattern not use next to the pattern is called baking sand this sand is used a number of times making sand it is sometimes called black sand because of its black color making sand before use the backing sand should be removed foreign materials like nails and pins etc that is used in previous okay now what is parting scent it is used for prevent that two halves of the mold two halves means oops and dark apart portion of the molding box and lower portion of the molding works from striking together parting sent separate two halves of the mold this is clean creepy silica sand which has no molding effect okay parting sent a mold is generally prepared into two or three boxes this boxes are separated to each other by spreading a fine salt dice and this is called parting sand okay now what is systematics and what is systematics and it is used in molding machine we're facing sand is not used since the world whole mold is metal machine complete mold is made in machine this sand is prepared artificially by adding suitable amount of additives binders water to the available sand okay the strength permeability and refractoriness must be higher than those of baking scent and pissing scent okay in mechanical boundaries we're missing molding is employed a so-called systematics and is used to fill the hole trucks trucks means hope and duck molding box systematics and the u s-- and is clean and reactivated by the addition of water binders and pestle additives here no pissing sand is used okay now what is pour scent the scent used for making core is known as poor scent it is also called oil scent okay it is a silica sand and contain linseed oil resin light mineral oil molasses that means sugarcane Dickstein charcoal product and other binding materials okay poor scent is suitable sand mixture employed for making poor a poor may be defined as any projection into the mold made up of poor scent okay here adequate permeability for escape gases and eya generated during putting the molten metal poor scent it is highly factor eNOS - we stand the effect of high temperature molten metal okay percent should be able to impart wood smoothness and finish to the poor surface okay it is clear my student what is the types of sand use [Music]