C-25 NPS Heavy Duty Copper Foil / Polyester Film EMI-RFI Shielding Laminate
C-25 NPS is a heavy duty copper foil and polyester film laminate at a total thickness of 0.0025″, with a copper shield that is solderable if done with care. It provides signal attenuation of 115dB @ 100 MHz and a dielectric strength of 5,000 volts, with breaking strength of 70 lbs./inch of width and tensile strength of 23,000 P.S.I. at 29% elongation at break.
Key Properties
- Signal Attenuation: 115dB @ 100 MHz (ASTM D4935-99)
- Tensile Strength: 23,000 P.S.I. (ASTM-D-882)
- % Elongation at Break: 29% (ASTM-D-882)
- Dielectric Strength: 5,000 volts (ASTM D149)
- Total Thickness: 0.0025″ (PSTC-33)
- Breaking Strength: 70 lbs./Inch of Width (ASTM-D-1000)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Polyester Film Thickness | 0.00092″ | — |
| Copper Foil Thickness | 0.0014″ | — |
| Total Thickness | 0.0025″ | PSTC-33 |
| Color | Copper | — |
| Weight/Square Yard | 10 Oz./Sq.Yd. | — |
| Yield | 1.6 Sq.Yds./Lb. | — |
| Shelf Life | 1 year @ 70°F(21°C)/50% R.H. | — |
Mechanical Properties
| Property | Value | Test Method |
| Breaking Strength | 70 lbs./Inch of Width | ASTM-D-1000 |
| Tensile Strength | 23,000 P.S.I. | ASTM-D-882 |
| % Elongation at Break | 29% | ASTM-D-882 |
Electrical Properties
| Property | Value | Test Method |
| Signal Attenuation | 115dB @ 100 MHz | ASTM D4935-99 |
| Dielectric Strength | 5,000 volts | ASTM D149 |
- EMI/RFI shielding for electronic enclosures
- Cable shielding
- Solderable shielding connections
- Lamination into composite shielding assemblies
- High-attenuation shielding for sensitive electronics
Common industries: Electronics manufacturing, telecommunications, cable and wire harness fabrication, aerospace/defense electronics.
C-25 NPS is a heavy duty, unsupported copper foil and polyester film laminate developed for EMI and RFI shielding in cable and connector applications. Unlike the lighter-gauge grades in the line, its copper shield can be soldered if done with care, giving fabricators a direct method of terminating or bonding the shield without relying solely on mechanical or adhesive attachment.
At 0.0025″ total thickness, C-25 NPS carries a heavier weight of 10 Oz./Sq.Yd. (yield of 1.6 Sq.Yds./Lb.) than the thinner grades in the line, along with a breaking strength of 70 lbs./inch of width and 29% elongation at break — properties that support its use in cable jacketing and other converting operations that demand added durability. It is supplied in copper color with a one-year shelf life at 70°F (21°C)/50% R.H.
What differentiates C-25 NPS from other foil laminate grades in the line?
C-25 NPS delivers a higher 115dB signal attenuation at 100 MHz than the standard 105dB grades, and its copper shield is solderable if done with care — a heavier-duty combination (0.0025" total thickness, 70 lbs./inch breaking strength) intended for cable shielding applications that require both stronger attenuation and a solderable termination.
Why does tensile strength matter for C-25 NPS?
With 23,000 P.S.I. tensile strength, 70 lbs./inch breaking strength, and 29% elongation at break, C-25 NPS can withstand the mechanical stresses of cable jacketing, slitting, and lamination without tearing, which is important given its heavier-duty, cable-shielding intended use.
What is the storage range for C-25 NPS?
The manufacturer's TDS lists a shelf life of 1 year when stored at 70°F (21°C) and 50% relative humidity.
Is C-25 NPS suitable for FCC-regulated EMI/RFI shielding environments?
No compliance standard is specified on the manufacturer's TDS for this material; specifiers requiring FCC or other regulatory certification should confirm suitability independently.
How should C-25 NPS be specified?
Specify grade (C-25 NPS), thickness, color, compliance requirements, dimensional tolerances, and finished format.
