GLASS : definition , manufacture , types and applications 

#definitionofglasses
#rawmaterials
#propertiesofglasses
#manufactureofglasses
#typesofglasses
#sodalimeglass
#flintglasses
#safetyglasses
#jenaglass
#borosilicate glasses
#coloredglasses
#photosensitiveglasses
#armouredorbulletproofglass
#flourosilicateglass
#glassapplicatons.