# Quality Control — 100% Testing

> Electrical, dimensional, and surface inspection on every spool. Test data archived and retrievable by furnace batch number. SGS and Bureau Veritas third-party inspection available on request.


## Electrical Testing

- Resistance uniformity — 4-wire Kelvin method, every spool
- EMF calibration — against NIST-traceable reference junction, per batch
- Insulation resistance — for extension and compensating cable

## Mechanical Testing

- Tensile strength and elongation — per **ASTM E8**
- Surface quality — visual inspection at 40× magnification
- Diameter tolerance — in-line laser micrometer, ±0.001 mm
- Eddy current — 100% surface defect detection

## Batch release sequence

A batch leaves the plant only after all four steps are complete:

1. **Melt chemistry verified** against the furnace record — OES analysis plus LECO carbon/sulphur and oxygen/nitrogen/hydrogen results.
2. **Spool tested** — resistance uniformity by 4-wire Kelvin, dimensional measurement by in-line laser micrometer, and 100% eddy-current surface inspection.
3. **EMF calibrated** against an NIST-traceable reference junction for the batch.
4. **MTC issued** and the full test record archived against the furnace number.

## Traceability System

- Unique furnace number per batch
- Full chemical composition report (OES)
- Test data archive, retrievable by furnace batch number
- SGS / BV third-party inspection available
- Dual certification (IEC + ASTM) on request