QUALITY CONTROL

The leads are first monitored for diameter consistency immediately after undergoing the compression stage. Following the firing process, they are checked for breaking resistance and diameter consistency. After the lead has been impregnated, it is checked for breaking resistance, stroke quality, grade of hardness, straightness and uniform diameter and length.

The pencils are checked after each production stage, e.g. for breaking strength, sharpenability and hot-foil stamping. Any pencil failing these controls is rejected.