A-25 90-68 Aluminum Foil / Polyester Film EMI-RFI Shielding Tape
A-25 90-68 is an aluminum foil and polyester film laminate tape engineered for EMI and RFI shielding of electronic components, providing signal attenuation of 95 dB @ 100 MHz from a 0.0040″ +/- 10% construction built with a 0.00035″ aluminum foil, 0.002″ polyester film, and 0.0015″ acrylic pressure-sensitive adhesive. It delivers a peel strength greater than 32 oz./inch of width initial and a dielectric strength of 8,800 volts, with a tensile strength of 14,500 P.S.I. and 90% elongation at break. The tape is supplied with a 90 lb. release liner.
Key Properties
- Peel Strength: >32 oz/inch of width initial (ASTM-D-1000)
- Signal Attenuation: 95 dB @ 100 MHz (ASTM D4935-99)
- Tensile Strength: 14,500 P.S.I. (ASTM-D-882)
- Dielectric Strength: 8,800 volts (ASTM D149)
- Total Thickness: 0.0040″ +/- 10% (PSTC-33)
- Elongation at Break: 90% (ASTM-D-882)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Aluminum Foil Thickness | 0.00035″ | — |
| Polyester Film Thickness | 0.002″ | — |
| Adhesive Thickness | 0.0015″ | — |
| Release Liner | 90 lb. | — |
| Total Thickness | 0.0040″ +/- 10% | PSTC-33 |
| Color | Silver | — |
| Shelf Life | 1 year @ 70°F(21°C)/50% R.H. | — |
Mechanical Properties
| Property | Value | Test Method |
| Peel Strength | >32 oz/inch of width initial | ASTM-D-1000 |
| 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 | 95 dB @ 100 MHz | ASTM D4935-99 |
| Dielectric Strength | 8,800 volts | ASTM D149 |
- EMI/RFI shielding for electronic enclosures
- Cable and connector shielding
- Grounding and static drain applications
- Shielding for PCB and component assemblies
- High-attenuation shielding for sensitive electronics
Common industries: Electronics manufacturing, telecommunications, industrial equipment, high-reliability electronics.
A-25 90-68 is a pressure-sensitive laminate built from a 0.00035″ aluminum foil, a 0.002″ polyester film carrier, and a 0.0015″ acrylic adhesive system, delivering 95 dB of signal attenuation at 100 MHz within a 0.0040″ +/- 10% total construction. The tape is intended for EMI and RFI shielding of electronic enclosures, cables, connectors, and PCB assemblies, and its 8,800-volt dielectric rating provides a notable electrical insulation margin relative to thinner grades in the line.
Its 90% elongation at break and 14,500 P.S.I. tensile strength support conformability and durability during converting and application to contoured or high-density assemblies. The tape is finished in silver, supplied with a 90 lb. release liner for clean unwind and precision die-cutting, and carries a one-year shelf life when stored at 70°F (21°C) and 50% relative humidity.
What differentiates A-25 90-68 from other tape grades in the line?
A-25 90-68 combines 95 dB signal attenuation @ 100 MHz with a notably high 8,800-volt dielectric strength and 14,500 P.S.I. tensile strength, exceeding the dielectric performance of the thinner A-10 and A-16 grades. Its 90% elongation at break and 0.0040" total thickness make it well suited to applications requiring both electrical insulation margin and mechanical durability during converting.
Why is peel adhesion important for A-25 90-68?
Peel adhesion determines how well A-25 90-68 anchors to the enclosure, cable, or component surface once applied. A peel strength greater than 32 oz/inch of width initial helps the tape resist edge lift and maintain a continuous shielding path through handling, converting, and long-term service.
What is the storage range for A-25 90-68?
The TDS specifies a shelf life of 1 year when stored at 70°F (21°C) and 50% relative humidity; no separate operating temperature range is stated on the manufacturer's TDS.
Is A-25 90-68 suitable for FCC-regulated EMI/RFI shielding environments?
No compliance standard is stated on the A-25 90-68 TDS, so suitability for FCC-regulated EMI/RFI shielding environments cannot be confirmed from the manufacturer's documentation for this specific grade.
How should A-25 90-68 be specified?
Specify grade (A-25 90-68), thickness, color, adhesive type, liner type, compliance requirements, dimensional tolerances, and finished format.
