super purity tungsten bar

Super purity tungsten bars' Type & Application TypeApplicationWAL1Applied for making filament,cathodes,setting rod at H.t,electrode,lead,support,typing needle etc W1Applied for making electrode ,lead and heater components. Note : Quality is strictly as per GB4181-2003 national standard. Chemical Composition: Type W Fe M0 Other element WAL1 ≥99.95% ≤0.001% ≤0.002% ≤0.001% W1 ≥99.95% ≤0.001% ≤0.002% ≤0.001% Note : K is not regarded as impurity. WAL1: K ≥ 75 PPM Dimension and tolerance VarityDiameter RangeDiameter ToleranceMINMAXBlack rod wroughted≥3.0mm±0.05mm±0.10mmStraightened rod0.5 →3.0mm±0.01mm±0.01mmGround rod≥0.8mm±0.01mm±0.05mm