A-41 NPS Aluminum Foil / Polyester Film EMI-RFI Shielding Laminate
A-41 NPS is an aluminum foil and polyester film laminate engineered for EMI and RFI shielding, providing signal attenuation of 112 dB at 100 MHz. Supplied without adhesive or liner, the laminate delivers a dielectric strength of 10,200 volts, tensile strength of 14,500 P.S.I., and elongation at break of 90%. Its unsupported construction makes it well suited for applications where a self-contained shielding layer is required rather than a pressure-sensitive tape.
Key Properties
- Signal Attenuation: 112 dB @ 100 MHz (ASTM D4935-99)
- Tensile Strength: 14,500 P.S.I. (ASTM-D-882)
- Elongation at Break: 90% (ASTM-D-882)
- Dielectric Strength: 10,200 volts (ASTM D149)
- Total Thickness: 0.0041″ +/- 5% (ASTM-D-3652)
- Aluminum Foil Thickness: 0.001″
We want to help!
Enter your information and we'll get you in touch with our knowledgable staff. We know how important to the right product for your project.
Request a Consultation
- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Aluminum Foil Thickness | 0.001″ | — |
| Polyester Film Thickness | 0.003″ | — |
| Total Thickness | 0.0041″ +/- 5% | ASTM-D-3652 |
| Color | Silver | — |
| Shelf Life | 1 year @ 70°F(21°C)/50% R.H. | — |
Mechanical Properties
| Property | Value | Test Method |
| Tensile Strength | 14,500 P.S.I. | ASTM-D-882 |
| Elongation at Break | 90% | ASTM-D-882 |
Electrical Properties
| Property | Value | Test Method |
| Signal Attenuation | 112 dB @ 100 MHz | ASTM D4935-99 |
| Dielectric Strength | 10,200 volts | ASTM D149 |
- EMI/RFI shielding for electronic enclosures
- Shielding of cable and connector assemblies
- Lamination into composite shielding constructions
- Shielding of PCB and component assemblies
- High-attenuation shielding for sensitive electronic assemblies
Common industries: Electronics manufacturing, telecommunications, industrial equipment, and defense/military systems.
A-41 NPS is an unsupported aluminum foil and polyester film laminate that combines a heavier 0.001″ aluminum foil layer with 112 dB of signal attenuation at 100 MHz, matching the high-attenuation performance of A-31 NPS while carrying a heavier 0.0041″ total thickness and a higher 10,200-volt dielectric strength. This makes it suited to shielding applications requiring both strong RF attenuation and increased insulation resistance.
The laminate is supplied in silver and carries a manufacturer-rated shelf life of one year when stored at 70°F (21°C) and 50% relative humidity. A tensile strength of 14,500 P.S.I. and elongation at break of 90% support slitting, die-cutting, and lamination into finished shielding assemblies without foil cracking or film delamination.
What differentiates A-41 NPS from other foil laminate grades in the A-Series line?
A-41 NPS matches A-31 NPS's high 112 dB @ 100 MHz signal attenuation but adds a heavier 0.0041" total thickness and a higher 10,200-volt dielectric strength, giving it more insulation margin than A-31 NPS at the same high-attenuation performance level — though unlike A-31 NPS, its TDS does not state an FCC compliance statement.
Why does tensile strength matter for A-41 NPS?
As an unsupported foil/film laminate with no adhesive backing, A-41 NPS relies on its 14,500 P.S.I. tensile strength and 90% elongation at break to withstand slitting, die-cutting, and lamination into finished assemblies without tearing the foil or delaminating the film.
What is the storage range for A-41 NPS?
The manufacturer's TDS rates shelf life at 1 year when stored at 70°F (21°C) and 50% relative humidity. No separate operating temperature range is specified on the TDS.
Is A-41 NPS suitable for FCC-regulated EMI/RFI shielding environments?
No — the manufacturer's TDS for A-41 NPS does not state an FCC or any other compliance standard, so suitability for FCC-regulated programs would need to be independently verified.
How should A-41 NPS be specified?
Specify grade (A-41 NPS), thickness, color, compliance requirements, dimensional tolerances, and finished format.
