How to Specify Foil Tape for Cable Shielding

1. Start with the intended function

State what the tape must do:

• Cable shielding;
• Grounding;
• EMI/RFI control;
• Conductive bonding;
• Insulation separation;
• Wrapping or surface protection;
• Die-cut localized coverage.

A tape selected for grounding may require a different adhesive and surface construction from a tape selected only for mechanical wrapping.

2. Specify the foil and construction

Include:

• Foil metal: aluminum, copper or other specified metal;
• Foil nominal thickness and tolerance;
• Single-sided or double-sided conductive construction;
• PET/Mylar backing, if used;
• Adhesive type and nominal coating weight;
• Release liner, if used;
• Surface treatment or coating;
• Total thickness and tolerance.

For laminated foil–PET products, request a layer diagram. The layer order should be written in the technical data sheet and matched to the sample.

3. Specify electrical performance

Define measurable requirements such as:

• Surface resistance and test condition;
• Contact resistance;
• Grounding continuity;
• Shielding effectiveness or transfer impedance, if required;
• Frequency range;
• Conductive side and contact method.

For example, a product page may state a surface-resistance limit for a particular construction. That number should not be generalized to every width, thickness, adhesive or production batch. Ask the supplier to confirm the exact grade and test method.

4. Specify width and conversion

State:

• Finished width;
• Width tolerance;
• Roll length;
• Inner core diameter;
• Maximum outer diameter;
• Winding direction;
• Edge quality;
• Joint-free length;
• Joint treatment;
• Slitting and rewinding requirements.

A width range such as 3–500 mm is useful as an initial capability statement, but the purchase specification should identify the exact width and tolerance required for the cable line.

5. Specify the adhesive and application process

The adhesive can influence grounding, peel, temperature resistance, residue, aging and compatibility with cable insulation. Request:

• Adhesive chemistry or product family;
• Peel adhesion test and substrate;
• Temperature range;
• Application pressure and dwell time;
• Repositionability, if relevant;
• Residue and aging performance;
• Compatibility with the cable insulation and jacket.

Do not use “strong adhesive” as a specification. Define the test method and target value.

6. Specify mechanical and environmental requirements

List the required:

• Tensile strength;
• Elongation;
• Flexibility and bend performance;
• Temperature exposure;
• Humidity exposure;
• Chemical resistance;
• Flame, smoke or halogen-free properties, where required;
• Storage temperature and shelf life.

These requirements should be connected to the actual application. A cable installed indoors may have a different requirement from a cable used in an industrial, automotive or outdoor environment.

7. Add quality and compliance documents

The RFQ should request the latest:

• Technical data sheet;
• Safety data sheet;
• Certificate of analysis;
• Compliance declarations;
• Batch inspection record;
• Packaging specification;
• Change-notification policy.

If a customer asks for ISO, RoHS, REACH, UL or flame-related evidence, state exactly which document is required. Company-level certification and product-level performance are different evidence types.

Foil tape RFQ checklist

How Tino Material should publish foil tape pages

Each page should show a “Specification at a glance” table above the long description. It should also include a downloadable technical data sheet, application photos, sample request form, related materials and a clear statement of which values are nominal, typical or guaranteed.

Suggested internal links:

• Copper foil tape
• Single-Conductive Copper Foil Tape
• Double-Conductive Copper Foil Tape
• Contact Tino Material

FAQ

What is the most important field in a foil-tape RFQ?

The intended function and construction are the starting point. A supplier cannot select the right adhesive, conductivity and thickness without knowing how the tape will be used.

Is total thickness the same as foil thickness?

No. Total thickness may include foil, PET film, adhesive and release liner. Each layer should be listed separately.

What does single-conductive mean?

It generally describes a tape with conductivity on one intended surface or through a defined construction. The supplier should define the exact structure and test method for the selected product.

Can foil tape be die-cut?

Many foil tape constructions can be converted or die-cut, but the result depends on foil thickness, adhesive, liner, geometry and equipment. Request a conversion sample.

How should foil tape be stored?

Follow the supplier's current storage specification. Keep rolls protected from humidity, contamination, direct floor contact and excessive heat, and confirm shelf life before use.