Published: June 17, 2026

Alternate Source for 3M™ DS/FS Series EMI Shielding Sleeve

PROBLEM:

A medical device manufacturer utilized 3M™ High Flex-Life EMI Shield Sleeve (specifically FS-30) to provide electromagnetic interference protection on flat cable assemblies within their equipment. The shielding sleeve was necessary to prevent electrical noise from affecting sensitive circuitry and signal integrity. When the manufacturer could no longer source the qualified FS-30 material, they faced a potential shortage that threatened production of their devices.

REQUIREMENTS:

To avoid process changes or a redesign of the customer's assembly, the replacement material needed to:

Meet or exceed the shielding effectiveness requirement

Maintain Flexibility

Utilize a similar conductive shielding construction

Install using the same general assembly process

Be available immediately to prevent interruption of production

SOLUTION:

Zippertubing® Flex Shield EMI shielding sleeve

Zippertubing's Flex Shield is a highly flexible, lightweight braided shielding sleeve constructed from Nomex threads wrapped with tin-plated copper foil. It maintains the same fundamental shielding approach as the previous FS-30 sleeve — a tin-plated copper foil conductive shield — and offers improved shielding effectiveness.

Flex Shield is also UL Recognized, has a VW-1 flammability rating, and operates across a temperature range of -40°F to 302°F. It is available in multiple diameters ranging from 1/8" to 1-1/2", including a size compatible with the customer's cable.

Flexible Braided Component Structure Roll

CONCLUSION:

By implementing Zippertubing's Flex Shield as an alternate braided shielding sleeve, the customer maintained the same style of conductive tin-plated copper shielding while preserving their existing assembly process. With material readily available in a suitable size, the manufacturer avoided production delays and continued building their medical devices without interruption. Zippertubing was also able to provide Flex Shield in exact-length pieces, removing a production step during harness assembly. Flex Shield provided a reliable long-term solution for flexible EMI shielding and avoided substantial engineering and production efforts that often accompany replacing a qualified component.

FAQ

1. What is similar about Zippertubing® Flex Shield and 3M™ FS Series shielding sleeves?

Both Flex Shield and 3M™ DS & FS Series sleeves use a conductive shielding construction built around tin-plated copper foil, rather than relying only on standard metallic braid. This allows both products to provide EMI shielding in a lightweight, highly flexible sleeve format intended for cable protection and noise suppression.

2. What makes Flex-Shield and 3M™ DS and FS Series shielding sleeves different from standard metal braid?

Flex-Shield and 3M™ DS and FS Series shielding sleeves use a wrapped foil construction rather than a traditional metal braid alone. This design provides significantly greater flexibility and a much longer flex life in dynamic applications. While standard metal braid may withstand only thousands of flex cycles, Flex-Shield and 3M™ shield sleeves are designed to achieve flex life in the millions of cycles.

3. Does Flex-Shield come in sizes comparable to 3M™ DS and FS Series shielding sleeves?

Yes. Flex-Shield is available in sizes comparable to the current 3M™ DS and FS Series shielding sleeve options, including DS-5, DS-7, DS-10, DS-14, FS-30, and FS-37. This allows Flex-Shield to serve as a practical cross-reference option for applications currently using those 3M sleeve sizes.

4. Can Zippertubing help me find alternate solutions for shielding sleeves that are obsolete or difficult to source?

Yes. Zippertubing regularly helps customers find alternate shielding products when existing materials become obsolete, constrained, or difficult to obtain. By evaluating the original sleeve’s shielding construction, flexibility, size, and application requirements, Zippertubing can often recommend a comparable replacement that supports continued production without unnecessary redesign.