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LABORATORY REPORT
Document ID
QC-2025-12-16-TS
Quality Control Department
Testing Report
Testing of tinplate from INDUMET Belgium, TATA STEEL for the production of drawn cans
QC Laboratory, Industrial Zone
December 16, 2025
QC Team members
On September 18, 2025, tinplate from the Belgian supplier INDUMET arrived at the factory. Specifications: TPS TH550 2.0/2.0 dimensions 0.165x910x886, intended for the production of drawn cans. The testing process took place in the following phases:
- 1 Receiving control
- 2 External analysis
- 3 Lacquering process
- 4 Printing phase
- 5 Can production
- 6 Final testing
1. Receiving Control
The received tinplate was properly delivered, packed, and protected. There is no mechanical damage to the packaging. 1500 sheets arrived. Results are shown in Table 1.
Table 1. Receiving control of tinplate
| Roll Number | Sample | Temper | Dimensions | Thickness | Tin Coating | Hardness (HR) |
|---|---|---|---|---|---|---|
| 091291797001 2.0/2.0 | 1500 sheets | TH 550 | 0.165x910x886 TPS | 0.165-0.166 | 2.0/2.04 2.12/2.08 |
73.5-73.0 |
Analysis Continued
Document ID
QC-2025-12-16-TS
2. External Analysis
Table 2. Tin and Chromium coating values
| Sample Zone | Free Tin (g/m²) | Tin Alloy (g/m²) | Total Tin (g/m²) | Chromium (mg/m²) |
|---|---|---|---|---|
| 1. (Face) | 0.93 / 1.11 / 0.93 | 0.9 / 0.86 / 0.85 | 1.83 / 1.97 / 1.78 | 3.2 |
| 1. (Back) | 0.88 / 0.85 / 0.88 | 0.88 / 0.9 / 0.88 | 1.76 / 1.75 / 1.76 | 3.0 |
3. Lacquering Procedure
Table 4. Lacquering parameters
| Operation | Lacquer ID | Wet Weight [g/sh] | Temperature Zones [°C] | Speed (t/h) |
|---|---|---|---|---|
| Pre-print | Stamp 818964 | 17 g/sh | 185-193-190 | 5000-5300 |
| Protective Lacquer | Silver 815766 | 12 g/sh | 155-163-160 | 5000-5300 |
| Internal Lacquer | Alu 816123 | 10 g/sh | 195-203-200 | 5000-5300 |
The requested tin coating was 2.0/2.0 g/m². According to the standard, the minimum allowed values for this coating are 1.6 g/m². Table 2 shows that values for the tested sample are below the minimum.
Final Findings
Document ID
QC-2025-12-16-TS
4. Printing and Production
Printing was performed on the Planeta machine. Testing conducted during the production run.
6. Final Tests and Documentation
Figure 1. Adhesion Control
Figure 2. Hydrolysis Test Result
Prepared by:
QC Analyst
Date of Completion:
Stamp and Authorized Signature:
Quality Manager Office