C-RAM FT-10 and HFP ferrite tiles and hybrid absorbers for EMC chambers, 20–30 MHz … 40 GHz

Country: · Model: C-RAM FT-10 / HFP

C-RAM FT-10 is a thin 100×100×6.3 mm tile of sintered ferrite ceramic for lining EMC chambers. The tile alone works in the 20 MHz – 1.5 GHz range, and with HFP hybrid absorbers the range reaches 40 GHz. It is used where foam pyramids would be too tall.

FT-10 material: sintered ferrite ceramic, no outgassing (suitable for vacuum)
Tile dimensions: 100×100×6.3 mm, central hole 10 mm; 300×300 mm panels on plywood with metal facing
Weight: 324 g per tile = 32.4 kg/m²
FT-10 reflectivity: −18 dB 30 MHz; −25 dB 100 MHz; −30 dB 200 MHz; −25 dB 400 MHz; −20 dB 600 MHz; −12 dB 1 GHz; −9 dB 1.5 GHz

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Technical specifications

FT-10 material	sintered ferrite ceramic, no outgassing (suitable for vacuum)
Tile dimensions	100×100×6.3 mm, central hole 10 mm; 300×300 mm panels on plywood with metal facing
Weight	324 g per tile = 32.4 kg/m²
FT-10 reflectivity	−18 dB 30 MHz; −25 dB 100 MHz; −30 dB 200 MHz; −25 dB 400 MHz; −20 dB 600 MHz; −12 dB 1 GHz; −9 dB 1.5 GHz
Operating range	FT: 20 MHz – 1.5 GHz (TDS: 30 MHz – 2 GHz); HFP: 20/26 MHz – 40 GHz
Temperature	up to the Curie point 203 °F (95 °C)
HFP	hollow matched hybrid absorbers 12–48 inches high on top of the FT tile
Application standards	ANSI C63.4 (radiated emissions), IEC 1000-4-3 (immunity)

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

Description

The tile has a central hole of 10 mm and a weight of 324 g, that is 32.4 kg per square meter of lining. According to bulletin 390-5, the reflectivity is −18 dB at 30 MHz, −25 dB at 100 MHz, −30 dB at 200 MHz, −25 dB at 400 MHz, −20 dB at 600 MHz, −12 dB at 1 GHz and −9 dB at 1.5 GHz. It is mounted only on a conductive surface, with epoxy or silicone adhesive or with self-tapping screws and plastic washers through the hole. For large areas there are 300×300 mm panels on plywood with metal facing. The ceramic does not outgas and works up to the Curie point of 203 °F (95 °C), but it is hard to cut, so gaps are left in the corners. HFP are hollow matched polyurethane foam pyramids from 12 to 48 inches high, and the combination of FT and HFP covers the range from 20–26 MHz to 40 GHz. The application complies with ANSI C63.4 and IEC 1000-4-3, and the tile is used in pre-scan, 3 m and 10 m chambers.

How to choose

FT-10 tiles are used in the lower part of the range up to 1.5 GHz, and above that HFP 12 to 48 inches high are added. The HFP height is chosen by the lowest frequency at which reflectivity is needed. The 300×300 mm panels are convenient for large areas because the tiles are already glued to the plywood. The dimensions are metric, so projects in feet are recalculated.