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SOP for Operation and Calibration of Bursting Strength Tester

The objective of this SOP is:
  • To describe the operation procedure of Bursting Strength Tester.
  • To describe the calibration procedure of Bursting Strength Tester.

The Chemist - Quality Control shall be:
  • Responsible for carrying out the analysis as per the procedure.
  • Responsible for interpretation of the results obtained
  • Responsible for timely calibration of the equipment.
  • Responsible for intimating any abnormal observation to Manager – Quality Control for necessary corrective actions.
Manager – Quality Control

Cleaning Procedure
  • Switch OFF Power Supply of the equipment before cleaning. Clean the equipment with a dry cloth every day.
  • If necessary wet cloth shall be used for effective cleaning it shall be dried immediately using a dry cloth.

Operating Procedure
  • Switch On the mains. This will bring the plunger to its starting positions. If the plunger is already at its starting position, motor will not start on switching ON main.
  • A representative sample of the material to be tested shall be placed over the diaphragm. The sample size shall be cut to 10 X 10 cm.
  • Place the sample specimen on the Platform.
  • The tripod plate shall tightened to apply sufficient clamping pressure in such a way that sample does not slip.
  • Select the gauge [II] for 3 ply shippers and partitions and gauge [I] for 5 ply and 7 ply shippers.
  • Set the maximum hand of the gauge at zero or a point on the scale below the point at which bursting will occur.
  • Push the RED push button and keep it pressed so that plunger will start rotating in clockwise direction till sample bursts. The push button is released as soon as the sample bursts. Note down the gauge reading in Analytical Test Reports.
  • Release the pressure on the test piece by rotating the clamp wheel in anti-cock wise direction and remove the sample specimen.

Calibration Procedure
  • Clean the equipment using a clean cloth.
  • Check the glycerin level [this bursting strength tester is a hydraulic unit and its accuracy depends on a completely filled hydraulic system. Inadequate glycerin quantity affects the accuracy of the gauge readings]
  • Take the standard Aluminium foil of 5.4 Kg / cm2 for Gauge II and 9.5 kg / cm2 for Gauge I provided by the manufacturer.
  • Operate the instrument as per operating procedure mentioned above.
  • Record the observations in the calibration record as per the Annexure - 1, in case of any discrepancy observed, affix an “Under Maintenance” label on the instrument and report to Executive - Quality Assurance to take necessary corrective actions.
  • After calibration affix the calibration status label.

Acceptance Criteria
  • For Gauge I : 9.0 to 10.0 Kg / cm2
  • For Gauge II : 5.2 to 5.6 Kg / cm2

Frequency of calibration: Quarterly.

Annexure – 1: Format for Calibration Record of Bursting Strength Tester


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