27 Nov How to identify the quality of tinplate
To identify if the tinplate is of good quality there are several factors and procedures that can be followed.
Visual Inspection: A visual observation must be carried out both inside and outside the tin containers, complementing it with a photographic record to detect possible defects or inconsistencies.
Quality Control at Reception: Upon receiving the tinplate, the labels must be checked and tests of the physical-chemical characteristics of the material must be carried out. This includes verification of dimensions, detection of surface defects and possible pores in the lamination.
Sample Analysis: Tin samples must be taken at the beginning and end of each coil to be analyzed in the laboratory, thus controlling its quality consistently.
Technical Specifications: The tinplate supplier must ensure that the tinplate specification is suitable for the stated end use. This includes aspects such as the level of passivation and the weight of the tin coating.
Standards Compliance: The tinplate manufacturer must have quality procedures to ensure that each order meets established standards, such as ASTM or ISO.
Corrosion Resistance Tests: Good quality tinplate should have high anti-corrosion properties, protected by tin and other passivation treatments.
Tin Coating Verification: The different types of tin coating must be identified, which are marked with parallel lines on one of the sides of the tinplate.
Surface Roughness: The surface roughness should be measured after chemically detinning the sample, and is done at right angles to the rolling direction.
Mechanical Characteristics: For certain uses, such as beverage containers, low-gauge, double-reduced tinplate may be specified to ensure adequate mechanical strength without extensive sterilization processes.