C-RAM SFC-HC / HC / CB-HC / CF honeycomb and cellular-glass high-power absorbers (up to 80 W/inch² with airflow, CF up to +343 °C)

C-RAM SFC-HC / HC / CB-HC / CF honeycomb and cellular-glass high-power absorbers (up to 80 W/inch² with airflow, CF up to +343 °C)

Country: · Model: C-RAM SFC-HC / HC / CB-HC / CF

C-RAM SFC-HC, HC, CB-HC and CF are absorbers on a rigid frame of phenolic honeycomb and cellular glass for powers up to 80 W/inch² with airflow. CF bricks work up to +343 °C. The materials do not melt and let cooling air through.

SFC-HC: pyramids of phenolic honeycomb; heights 3¼–24 inches (82–610 mm), 48–72 inches on request; 24×24 inch panel
SFC-HC power: 10 W/inch² without airflow; 20/40/60/80 W/inch² at an air speed of 200/300/400/600 ft/min (10 GHz)
SFC-HC range: from 500 MHz
HC (flat sheets): Nomex/phenolic or glass/phenolic honeycomb; sheets 12×12 or 24×24 inches, thickness 0.5–4.0 inches; cell 3/16 inch

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Technical specifications

SFC-HC	pyramids of phenolic honeycomb; heights 3¼–24 inches (82–610 mm), 48–72 inches on request; 24×24 inch panel
SFC-HC power	10 W/inch² without airflow; 20/40/60/80 W/inch² at an air speed of 200/300/400/600 ft/min (10 GHz)
SFC-HC range	from 500 MHz
HC (flat sheets)	Nomex/phenolic or glass/phenolic honeycomb; sheets 12×12 or 24×24 inches, thickness 0.5–4.0 inches; cell 3/16 inch
HCGR	graded sheets: 0.5 inch — −15 dB at 10–18 GHz; 0.75 — at 8–18 GHz; 1.0 — at 6–18 GHz
HCGI / HCUI	sheets with specified insertion loss up to 20 / 30 dB/inch
CF	cellular glass bricks 12×18 inches, 2 or 3 inches; −70…+650 °F (−57…+343 °C); 10 W/inch² (25 W/inch² at 100 ft/min); CF-2: 14 dB at 1–2.5 GHz, 17 dB at 3.5–14 GHz
Operating temperature HC/SFC-HC	up to 400 °F (204 °C)

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

Description

SFC-HC are phenolic honeycomb pyramids 3¼–24 inches (82–610 mm) high on a 24-inch panel, and for 48 and 72 inches they are assembled from sections. Without airflow they dissipate 10 W/inch², and at air speeds of 200, 300, 400 and 600 ft/min the permissible power rises to 20, 40, 60 and 80 W/inch² (tested at 10 GHz). Flat HC sheets made of Nomex/phenolic honeycomb measure 12×12 or 24×24 inches, are 0.5–4.0 inches thick and have a 3/16 inch cell. HCGR with graded impregnation gives at least −15 dB: the 0.5 inch sheet at 10–18 GHz, 0.75 at 8–18 GHz, 1.0 at 6–18 GHz. HCGI and HCUI are made with insertion loss up to 20 and 30 dB/inch. CF are cellular glass bricks of 12×18 inches, 2 or 3 inches thick, which work from −70 to +650 °F (−57 to +343 °C) and dissipate 10 W/inch², or 25 W/inch² with 100 ft/min airflow. CF-2 gives 14 dB at 1–2.5 GHz and 17 dB at 3.5–14 GHz.

How to choose

SFC-HC pyramids are used for chambers and test stands with high RF power, flat HC sheets for radomes and covers, and CF where the highest temperature is needed. For foam versions, ventilated and all-weather, there are C-RAM EVA, SFC-MP, ODP and CFC. The corner of the chamber is filled with CB-HC blocks.

Request a price and lead time

C-RAM SFC-HC / HC / CB-HC / CF honeycomb and cellular-glass high-power absorbers (up to 80 W/inch² with airflow, CF up to +343 °C). We reply within one business day.