Shrink-N-Shield® (4:1)


A heat-shrink tubing that provides exceptional shielding from EMI, RFI and EMF, and has a 4:1 shrink ratio.
  • This product provide an easy, one-step installation and provides a lower total installed cost
  • Shrink-N-Shield (4:1) EMI shielding material offers better shielding effectiveness of 65 db from 10MHz to 10GHz
  • Excellent anti abrasive, environmental, chemical, and electrical properties with resistance to most oils and fluids, mild acids, and alkalis

Shrink-N-Shield® (4:1) has a 4:1 shrink ratio for components with diameters from 0.75” to 2”.

Shrink-N-Shield® (4:1) is an EMI shielding heat-shrink tubing that can be cut to length for versatile application uses. The flame-retardant and self-extinguishing polyolefin sleeve can withstand temperatures up to 275°F (135°C). Additionally, the jacketing has excellent abrasion, chemical, fluid and fungus resistance.

Shrink-N-Shield® (4:1) comes standard with the Z-3250-CN shielding cloth. However, other EMI-shielding cloths are available upon request.

The Z-3250-CN shielding cloth is made of a taffeta fabric plated with copper and nickel for excellent corrosion protection. The lightweight, flexible shielding cloth will not flake or deteriorate over time, so you can be confident your components will have long-lasting protection against EMI, RFI, and EMF.

Shrink-N-Shield® (4:1) is offered in diameters from 0.75” to 2” with custom sizes available upon request, and has an operational temperature range of -67°F to 275°F (-55°C to 135°C).

If you require a 2:1 or 3:1 shrink ratio, Zippertubing® offers Shrink-N-Shield (2:1) and Shrink-N-Shield (3:1), and if you have components with diameters as small as 0.015”, Shrink-N-Shield (Nano) is also available for your EMI shielding heat-shrink needs.

If your application is more suited to a wrap-around heat shrink for ease of installation, PRT® (S-3250) and PRT® (S-7200) are the solutions. Both standard products offer EMI shielding and can easily wrap around your wires or cables, rather than having to pull them through. If required, other EMI-shielding fabrics are available for PRT® upon request.

*Class III polyolefin heat-shrink tubing is available upon request.


  • 4:1 shrink ratio allows for versatile application
  • Shields wires from EMI, RFI, and EMF
  • Flame-retardant and self-extinguishing jacketing


  • 0.75” and 1” diameters in 1 foot sticks are available on Amazon
  • Can be used as secondary jacketing for protection of wires or cables
  • Operational temperature range of -67°F to 275°F (-55°C to 135°C)
  WARNING: Cancer and Reproductive Harm  |


RoHS Compliant
Shelf Life 60 months
Minimum Operating Temperature -67 ° F (-55 ° C )
Maximum Operating Temperature 275 ° F (135 ° C )

Available Attributes

Shape of Installation Round
Exterior Material Polyolefin Heat Shrink
Shielding Z-3250-CN
Diameter Before Shrinkage 0.75"
Shrink Ratio 4:1
Unit Length 1 ft. Stick
4 ft. Sticks
Material Color Black
Minimum Shrinkage Diameter 0.1875"
Shield Bonding Nitrile Adhesive


Specific Gravity 1.35 (max.)
Flammability UL224, VW-1, Self-extinguishing
Dielectric Strength 500v/mil (after shrink)
Fluid Resistance Best
Mil-Spec SAE-AMS-DTL-23053/5
Fungicide No Growth
Longitudinal Shrinkage +/-5% (after heat recovery)
RoHS Compliant
Abrasion Resistance Best
Elongation 200% (after shrink)
Material Thickness 0.035" - 0.055"
Minimum Operating Temperature -67 ° F (-55 ° C )
Maximum Operating Temperature 275 ° F (135 ° C )
Tensile Strength 1500 psi. (after shrink)
Flexibility Better

Coating Nickel Over Copper
Base Fabric Polyester Taffeta Fabric
Surface Resistivity <0.1 ohms/sq
RoHS Compliant
Shelf Life 60 months
Elongation 27%
Material Thickness 0.004"
Shielding Effectiveness Better
Durability Better
Minimum Operating Temperature -40 ° F (-40 ° C )
Maximum Operating Temperature 250 ° F (121 ° C )
Tensile Strength 74-79 lbs/in

Attenuation data was obtained using MIL-STD-285 (modified). Testing was performed by accredited, third-party EMI laboratories.