CAN/CSA C62155-06: Tolerances on Dimensions and Form for Aluminium and Aluminium Alloy Foils

1. Scope

CAN/CSA C62155-06 is the Canadian adoption of IEC 62155:2003, which specifies tolerances on dimensions and form for aluminium and aluminium alloy foils. This standard applies to foils produced from wrought aluminium and aluminium alloys, with nominal thicknesses typically ranging from 0.006 mm to 0.200 mm. The requirements cover thickness, width, length, camber, and flatness for foils supplied in coil or sheet form.

The standard is intended for use by manufacturers, converters, and end-users to ensure consistent dimensional quality and interchangeability. It does not cover foil products intended for use in electrical cable wrapping or capacitor winding where specific IEC standards may apply, but it serves as the primary reference for general-purpose aluminium foil dimensional control in Canada.

2. Technical Requirements

2.1 Thickness Tolerances

The standard defines permissible variations from the nominal thickness for a single measurement and for the average thickness across a foil width. Tolerance classes are designated as Class A (more precise) and Class B (commercial). Table 1 summarizes the typical thickness tolerance values for standard applications.

2.2 Width and Length Tolerances

For foils supplied in coil form, the width tolerance is dependent on the nominal width and the trimming condition. For slit widths up to 500 mm, the tolerance is typically ±0.5 mm for mill‑trimmed edges and ±0.15 mm for precision slit edges. Length tolerances apply to sheet products and are specified as a percentage of the nominal length or a fixed value, whichever is more restrictive. CAN/CSA C62155-06 also includes provisions for camber (edge bow) and flatness, defining maximum allowable deviation per unit length to ensure suitability for downstream converting processes.

3. Implementation Highlights

3.1 Measurement Practices

Thickness shall be measured using a micrometer or an equivalent instrument with a resolution of at least 1 µm. For average thickness, at least five readings spread across the foil width must be taken. The standard also specifies the measuring force and anvil diameter to prevent deformation of the soft foil surface. Width measurements are performed with a steel tape graduated in 0.5 mm increments, and camber is assessed on a flat inspection table using a straightedge and feeler gauge.

3.2 Sampling and Acceptance

Sampling plans follow ASTM E122 or equivalent statistical methods, with a normal inspection level of II per CA‑CSA C62155‑06 Annex B. A lot is defined as the quantity of foil of the same alloy, temper, and nominal dimensions produced from the same rolling batch or within a continuous production period. Unless otherwise agreed, the supplier must certify that the product meets all requirements; verification testing is performed on a frequency agreed between purchaser and supplier. If test results fall outside specified tolerances, the lot may be reinspected on a double‑sample basis, with acceptance only if both original and additional samples conform.

3.3 Marking and Packaging

Each coil or bundle must be marked with the alloy, temper, nominal thickness and width, lot number, and net mass. The standard recommends that the purchase order invokes the tolerance class (Class A or B) and, if required, the edge condition (mill‑trimmed or slit). Packaging must protect the foil from moisture and mechanical damage during transit; inner wrapping with vapour‑phase inhibitor paper is common for long storage.

4. Compliance Notes

Compliance to CAN/CSA C62155-06 is voluntary in Canada unless specified in a contract or regulation. However, many industrial sectors adopt it as a requirement for quality assurance. The standard is harmonized with ISO 2142 and ASTM B479, but it includes specific Canadian exceptions regarding preferred metric dimensions and the use of SI units exclusively. Authorities having jurisdiction may reference this standard in building, packaging, or electrical safety codes when foil is used as a component.

To claim compliance, a manufacturer should maintain records of dimensional inspections, calibration certificates for measuring instruments, and traceability of raw materials. Third‑party testing by an accredited laboratory can strengthen a supplier’s compliance declaration. Non‑conforming material should be clearly identified and segregated, and deviation permits should be obtained from the purchaser before shipment if any dimensions fall outside the specified tolerances.

Frequently Asked Questions

Publication year of this article: 2026