Twist number of Glass cord

1. Specimen
	The specimens shall be taken as follows; The specified number of bobbins shall be sampled from one lot. The specimens shall be taken from above sampled bobbins after 1m is rejected.
2. Test procedure
	The specimen shall be clamped on twist counter at 500 mm intervals between grips while applying pretension so as to prevent it from untwist. Then grip of one side is rotated until no turn is observed on the specimen. Twist number is read on the number of rotation(T1).
3. Calculation
	Twist number per 25 mm interval shall be calculated as follows;
	Twist number shall be reported in average T/25mm of two measurements to the first decimal place.