Lead in Zinc Test

Purpose of Test: A high in-demand visual effect is crystalline spangling on the surface of the metallic coated steel sheet. Trace metals such as lead (Pb) and antimony (Sb) promote spangle formation. Lead is also known for its effectiveness in decreasing the surface tension of zinc; allowing it to flow easily. However, this visual property comes at cost; as Lead is a toxic substance with severe health risks upon exposure. It can also have negative effect on the performance of galvanized steel sheets. Large amounts of lead in zinc can lead to darkening of the spangles over time as well as delayed adhesion failure. The maximum safe limit for the amount of lead in zinc specified in SASO ASTM & ASTM A653/A653M is (90 mg/kg). Inductive coupled plasma (ICP) is considered one of the most accurate method for measuring the lead content in zinc. Device/Machine: Inductively coupled plasma device (ICP). External Calibration Frequency:

o  Inductively coupled plasma device (ICP): Prior to each use.

Approximate  Test Duration:

o  Sample preparation and Test time: 4 – 6 Hours.

Specification: ISO 3815 part 2