The four major classes of organic molecules include carbohydrates, proteins, lipids and nucleic acids .â. Carbohydrates. The term carbohydrate is actually a descriptor of what these molecules are composed of; carbon hydrates, in a ratio of one carbon molecule to one water molecule (CH2O)n.
postforming. (engineering). Forming, bonding, or shaping of heated, flexible thermoset laminates before the final thermoset reaction has occurred; upon cooling, the formed shape is held.1  Facebook.orming, bonding, or shaping of heated, flexible thermoset laminates before the final thermoset reaction has occurred; upon cooling, the formed shape is held.
What is a Preform? Preform is to form or shape a product to a preliminary shape and size. In easy words for PET Preforms the PET (Polyethylene Terephthalate) material is formed to a shape which is like moulded to a specific shape which is then afterwards blown to a bottle in the blowing machine. There is one characteristic of PET preform, which is the product that made from it will be clear and transparent.