C-RAM SFC / SFC Wedge / SFC-EM / SFC Walkway / Corner Block pyramidal and wedge absorbers for anechoic chambers, from 70–100 MHz

C-RAM SFC / SFC Wedge / SFC-EM / SFC Walkway / Corner Block pyramidal and wedge absorbers for anechoic chambers, from 70–100 MHz

Country: · Model: C-RAM SFC / SFC Wedge / SFC-EM / SFC Walkway / Corner Block

C-RAM SFC are broadband pyramidal and wedge absorbers for anechoic chambers, from 70–100 MHz. Heights are from 3 to 96 inches on a 24×24 inch (610×610 mm) base, and the reflectivity of SFC-24 at 3–18 GHz is from −55 to −60 dB.

Material: low-density polyurethane foam with carbon impregnation, painted blue (unpainted on request)
SFC heights: from 3 to 96 inches (76 mm – 2.4 m); up to SFC-72 classic pyramids, SFC-72/96 are twisted
SFC base: 24×24 inch (610×610 mm) panel
SFC reflectivity: SFC-12: −38…−60 dB at 0.3–10 GHz; SFC-24: −20 dB at 0.3 GHz, −55…−60 dB at 3–18 GHz

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Technical specifications

Material	low-density polyurethane foam with carbon impregnation, painted blue (unpainted on request)
SFC heights	from 3 to 96 inches (76 mm – 2.4 m); up to SFC-72 classic pyramids, SFC-72/96 are twisted
SFC base	24×24 inch (610×610 mm) panel
SFC reflectivity	SFC-12: −38…−60 dB at 0.3–10 GHz; SFC-24: −20 dB at 0.3 GHz, −55…−60 dB at 3–18 GHz
Power	up to 1.0–1.25 W/inch² (1.55–2 kW/m²) without forced airflow
SFC Wedge	wedges 3–36 inches, base 24×48 inches, weight 4–30 lb; up to −45…−50 dB
SFC-EM	truncated pyramids 20/31/42 inches (510/760/1067 mm); from 70–80 MHz; SFC-24EM — MIL-STD-461/462D, EN 1000-4-3
Walkway	based on SFC up to SFC-24; panels 24×48 or 24×24 inches; at 10 GHz reflectivity is limited to ≈ −25 dB
Flame resistance	NRL 8093 tests 1–3, MS-8-21 tests 1–3, T.I. 2693066, ASTM E-84-97a class A, UL94 HF-1
Mounting	neoprene contact adhesive, Velcro (up to SFC-24), clip & rail system

Specifications are taken from the manufacturer’s technical documentation. Updated 11/06/2026.

Description

The material, low-density polyurethane foam with carbon impregnation, is painted blue on the outside. Classic pyramids are made up to SFC-72, and SFC-72 and SFC-96 are also available in a twisted version. SFC-12 gives from −38 dB at 300 MHz to −60 dB at 3–10 GHz, and SFC-24 about −20 dB at 300 MHz. The permissible power is 1.0–1.25 W/inch² (1.55–2 kW/m²) without airflow. SFC Wedge are wedges of 3–36 inches on a 24×48 inch base for tapered chambers and are sensitive to polarization. The SFC-EM truncated pyramids of 20, 31 and 42 inches are intended for EMC chambers, SFC-24EM complies with MIL-STD-461/462D, and the pair SFC-24EM and SFC-36EM is suitable for testing to EN 1000-4-3. The SFC Walkway has a 13 mm skin, and at 10 GHz its reflectivity is limited to about −25 dB. The range complies with NRL 8093, MS-8-21, T.I. 2693066, ASTM E-84-97a class A and UL94 HF-1.

How to choose

The pyramid height is chosen by the lowest operating frequency of the chamber, and the lower it is, the taller the absorber. SFC Wedge is used for tapered chambers and the side walls of long chambers, and SFC-EM for EMC chambers. Mounting is with neoprene contact adhesive, Velcro tape for grades up to SFC-24, or a clip & rail system. If the power exceeds 1.25 W/inch², look at SFC-MP with 2.0 W/inch² without airflow.

Request a price and lead time

C-RAM SFC / SFC Wedge / SFC-EM / SFC Walkway / Corner Block pyramidal and wedge absorbers for anechoic chambers, from 70–100 MHz. We reply within one business day.