SOP on Weighing of Raw Materials
1.0 Purpose: This SOP describes a method for weighing of raw materials.
2.0 Scope: This SOP applies to Stores department and Production Chemist.
3.0 Responsibility: Production Manager to ensure that procedure is followed.
4.0 Materials and Equipment:
5.1.0 Weighing Operations in Stores
5.1.1 Before commencement of any weighing, it should be checked that weighing balance is clean and that there is no dust on platform.
5.1.2 Before first use each day, it should be checked whether weighing balance is in order and whether the sensitivity or accuracy is within stipulated limits. Records must be kept of such checks.
5.1.3 When two lot numbers are used to make up the required quantity, amounts of each and lot numbers should be recorded.
5.1.4 The materials being dispensed should be clearly labeled with –
a. Name of material, code number (if any), lot number, quality control release number.
b. Name of product for which it is intended, batch number of product, product code number.
c. Tare weight, gross weight and weight of material.
5.2.0 Weighing Operations in Production Area
5.2.1 The labeling and indicated weights should be checked against those intended for formulation order or production ticket.
5.2.2 All containers should be weighed individually and gross weight should be cross checked.
5.2.3 When ingredient has been added to formulation, tare weight should be checked and net weight as shown on container label should tally with difference between gross weight and tare weight.
5.2.4 The formulation order or production ticket should be checked and signed to confirm that material was correct and that it has been added to formulation.