ECCOSORB Alternatives

Key Takeaways

What an ECCOSORB Alternative Must Replace

A search for an ECCOSORB alternative often starts with price, lead time, or the need for a second source. Those concerns matter, but the installed material’s job comes first. An absorber used to damp a cavity resonance cannot be replaced on the strength of a similar-looking datasheet or a broad frequency claim.

The ECCOSORB range covers near-field noise suppression, cavity damping, surface-current control, free-space reflection reduction, isolation, and transmission-line applications. Alternative product lines are available from several manufacturers, but no single product replaces the whole range.

Record the current part number, thickness, location, backing, operating environment, and RF problem before building a shortlist.

Start with the Exact ECCOSORB Product and Application

ECCOSORB is a portfolio, not one material. Laird’s published selection information divides its absorbers by function, form, and frequency.

A search based only on the ECCOSORB name mixes several unrelated requirements. The existing part may be a thin magnetic sheet, a tuned reflector, a lossy foam, or a machinable material inside a waveguide.

Reference: Laird RF Microwave Absorber Selection Guide [PDF]

ECCOSORB Alternative Suppliers and Product Lines

Independent RF absorber suppliers

The manufacturers below publish RF absorber families for applications that overlap parts of the ECCOSORB range. Their product lines provide a place to start, but each grade still has to be checked against the existing design.

A supplier page narrows the field. Qualification determines whether a particular grade can replace the material already used in the product.

Microwave Factory EC-SORB and its model-name change

Microwave Factory is a special case. Its current EC-SORB portfolio includes products that previously carried ECCOSORB model names.

In October 2025, Microwave Factory announced that affected products shipped from January 1, 2026, would use EC-SORB® in place of ECCOSORB®. The company stated that the specifications would remain unchanged. Examples included ECCOSORB® AN becoming EC-SORB® AN, ECCOSORB® LS becoming EC-SORB® LS, and ECCOSORB® MF becoming EC-SORB® MF.

The name change documents continuity within Microwave Factory’s product range. It does not document interchangeability with every product currently sold by Laird under the ECCOSORB name.

For a legacy part, compare the latest datasheets from both sources and note the manufacturer, model number, revision date, material, and test method. Microwave Factory should also confirm the current model corresponding to the old part number.

References: Microwave Factory EC-SORB Product List; Notification of Product Model Number Change

How to Compare RF Absorber Alternatives

1. Match the material to the RF problem

   Define the job before comparing product names. Common requirements include near-field suppression, cavity damping, surface-wave attenuation, antenna isolation, reflection reduction, and termination of a transmission path.

   A magnetically loaded elastomer used to lower cavity Q differs from carbon-loaded foam placed in a free-space path. Machinable epoxy in a waveguide termination is another category entirely. Shortlist products made for the same function as the current material.

2. Check the performance curve at the problem frequency

   A published operating range only shows where a supplier expects the material to be used. It does not state the loss at every frequency in that range.

   Review the complete attenuation, reflectivity, insertion-loss, permeability, or permittivity data. For a narrowband problem, the absorption peak must fall at the required frequency with the proposed thickness and mounting arrangement.

3. Account for thickness and physical form

   A thicker grade can improve absorption at lower frequencies, but the part still has to fit. Check clearance, compression, bend radius, sheet size, weight, and any required air gap or conductive backing.

   Available forms include solid sheet, foam, coating, castable compound, dispensable material, and machinable stock. Moving from one form to another changes the mounting method and often changes how the material interacts with the field.

4. Review the operating environment

   Depending on the project, the material may need documented temperature performance, flammability, low outgassing, moisture resistance, chemical resistance, or freedom from silicone.

   RoHS, REACH, UL, and similar declarations are grade-specific. They may also depend on the thickness, adhesive, or custom construction. Use documents for the exact configuration being purchased.

5. Include fabrication and supply in the evaluation

   Check sheet sizes, pressure-sensitive adhesive, die-cutting, waterjet cutting, machining, molding, and other processing requirements.

   Ask for current information on samples, minimum quantities, production lead times, lot traceability, and test reports. Catalogs and old distributor listings are unreliable sources for these commercial details.

Why a Frequency Range Is Not Enough

Manufacturers do not always define frequency ranges in the same way. One range may show where measurable loss occurs. Another may mark the band in which a specified reflectivity target is reached.

Compare curves measured under reasonably similar conditions. If matching data is unavailable, use the datasheet to select samples and test them. Do not use it as proof of equivalence.

How to Qualify a Replacement Before Changing the BOM

Once the published specifications look plausible, move to controlled testing.

1. Document the current material

   Record the full part number, thickness, backing, installed location, and purpose.

2. Define the performance target

   Identify the failing frequency or required result and document how it will be measured.

3. Select technically comparable samples

   Choose materials with the same basic function, a suitable physical form, and published data at the required frequency.

4. Use the intended production configuration

   Obtain samples in the thickness, adhesive, backing, and construction planned for production.

5. Test in the actual application

   Evaluate each candidate in the enclosure, antenna, cavity, or transmission structure where it will be installed.

6. Run mechanical and environmental checks

   Confirm fit, adhesion, temperature behavior, durability, and required compliance documentation.

7. Evaluate production consistency

   Test a production-representative lot before completing engineering and supply-chain approval.

Keep the existing material as the control. Otherwise, a change in placement, assembly, or measurement can look like a change in absorber performance.

Common Mistakes When Replacing ECCOSORB

• Selecting the lowest quote before checking RF performance and environmental limits
• Treating a wide catalog range as evidence of adequate loss at one frequency
• Comparing reflection loss directly with insertion loss or attenuation per unit length
• Replacing a magnetic sheet with foam because both products mention the same band
• Ignoring thickness, conductive backing, placement, or incidence angle
• Assuming EC-SORB and ECCOSORB products with similar names are interchangeable
• Comparing an archived datasheet with a current product specification
• Approving a production change from one small prototype test

Material price is only one part of the cost. Repeated EMC testing, new tooling, assembly changes, or another qualification cycle can erase the initial saving.

Frequently Asked Questions About ECCOSORB Alternatives