Quality TestinG

Control and Testing

• IN-PROCESS QUALITY CONTROL CHECKS N-PROCESS QUALITY CONTROL CHECKS
• QUALITY CONTROL TESTING CHART

IN-PROCESS QUALITY CONTROL CHECKS

S.No.	STAGE	CHECKING PARAMETERS
1	MANDREL*	Mandrel OD
2	TUBE EXTRUSION*	Tube OD, Eccentricity,Cooling water temperature
3	WIRE WINDING*	No. of Ends, Wire Diameter
4	BRAIDING*	Braid OD, Pitch
5	COVER EXTRUSION*	Cover OD, Eccentricity,Cooling water temperature
6	WRAPPING*	Brand Marking , Wrapping pitch
7	VULCANISATION	Temperature, Steam Pressure , Duration *Visual Inspection for any finish/physical deformation or irregularity.

QUALITY CONTROL TESTING CHART

Rubber Compound

S.No.	PROPERTIES	NO. OF SPECIMENS	FREQUENCY
1	Rheological Properties	1	100%, every batch
2	Hardness	1	100%, every batch
3	Tensile strength and elongation at break	3	Every 5th batch
4	Specific gravity	1	100%, every batch
5	Accelerated ageing	1	Once a week

Brass Coated Steel Wire

S.No.	PROPERTIES	NO. OF SPECIMENS	FREQUENCY
1	Visual Inspection	Random	Every consignment
2	Diameter	5	Every consignment
3	Cast diameter	5	Every consignment
4	Breaking strength	3	Every consignment
5	Knot test	2	Every consignment
5	Weight/meter	2	Every consignment

Finished Product

S.No.	PROPERTIES	NO. OF SPECIMENS	FREQUENCY
1	Visual Inspection	Every length	Each control unit
2	Dimensions	6	Each control unit
3	Adhesion test	2	Each control unit
4	Flexibility of hose	3	Each control unit
5	Proof pressure test	Each hose	Each control unit
6	Pneumatic test	15	Each control unit
7	Bursting pressure test	1	Each control unit
8	Grip strength	1	Each control unit
9	Burning behaviour	1	Each control unit
10	Low temperature flexibility	1	Each control unit
11	Ozone resistance	1	Each control unit
12	Resistance of lining to n-pentane	1	Each control unit