What is BS 2782-6:METHOD 621C – Bulk factor of molding materials about?
Bulk factor of a molding material the ratio of the volume of a given mass of molding material to its volume in the molded form.
BS 2782-6 discusses Method 621C for bulk factor determination of molding materials.
Method 621C has been prepared under the direction of the Plastics Standards Committee. 
Method 621C is one of a series of methods described in BS 2782-6 for the evaluation of bulk factors of molding materials.
BS 2782-6: Method 621C specifies a method of determining the bulk factor of a molding material from its apparent density in the unmolded form and its density in the molded form.
Who is BS 2782-6:Method 621C - Bulk factor of molding materials for? 
BS 2782-6:Method 621C on bulk factor determination in molding materials is relevant to: 
- Manufacturers of plastic molding materials 
- Plastic manufacturing industry 
- Product designers/product development teams 
- Quality control and testing authorities 
Why should you use BS 2782-6:Method 621C - Bulk factor of molding materials?
Evaluating the dimensional properties of plastics is crucial in determining the performance, quality and durability of the material. In this regard, bulk factor is the ratio of the volume of any given quantity of the loose plastic material to the volume of the same quantity of the material after molding or forming. Knowledge of the bulk factor of a moulding material is of value as a basis for the calculation of minimum cavity volume in the design of molds.
BS 2782-6: Method 621C provides best industry guidance on the test procedure for the accurate evaluation of bulk factor in molding materials.
As a result, if you are a manufacturer of polymer and plastic molding materials, complying with BS 2782-6: Method 621C can provide indication on the volume change that can be expected during processing.
