C-RAM RGD / KR / KRS / KFS / VHP rigid and cast iron-epoxy and iron-silicone absorbers, radar-absorbing paints

Country: · Model: C-RAM RGD / KR / KRS / KFS / VHP

C-RAM RGD, KR, KRS, KFS and the HP and VHP paints are iron-filled absorbers with high magnetic losses. They are used to make matched loads, attenuators and parts for damping resonances in microwave modules. The RGD and KR range is 800 MHz to 18 GHz.

RGD: iron-filled epoxy; sheets 305×305 mm, 3.2–76 mm; rods and bars up to 3 inches; non-corroding grade RGD-IS-115
RGD properties: up to 180 °C (350 °F); tensile strength 560 kg/cm² (8000 psi); 85 Shore D; water absorption < 0.1 % in 24 h; > 10¹¹ Ω·cm
KR: two-part iron-epoxy casting resin, grades -110…-124 (density 2.1–4.5); mixing 1:1; cure 2 h at 149 °C (KR-…-RT cures at room temperature)
KRS / KFS: iron-silicone RTV (properties as RGD-S) and magnetic silicone for VHF/UHF; up to 204 °C

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Technical specifications

RGD	iron-filled epoxy; sheets 305×305 mm, 3.2–76 mm; rods and bars up to 3 inches; non-corroding grade RGD-IS-115
RGD properties	up to 180 °C (350 °F); tensile strength 560 kg/cm² (8000 psi); 85 Shore D; water absorption < 0.1 % in 24 h; > 10¹¹ Ω·cm
KR	two-part iron-epoxy casting resin, grades -110…-124 (density 2.1–4.5); mixing 1:1; cure 2 h at 149 °C (KR-…-RT cures at room temperature)
KRS / KFS	iron-silicone RTV (properties as RGD-S) and magnetic silicone for VHF/UHF; up to 204 °C
Resin packaging	kits of 1.35 / 2.7 / 11.3 kg; shelf life KR ≥ 6 months, KRS ≥ 12 months
HP / VHP paints	magnetic coatings on a urethane, silicone or epoxy binder, cured at room temperature; silicone −62…+204 °C, 60–70 Shore A
Range	RGD/KR 800 MHz – 18 GHz (KR-117/-124 below 20–30 GHz), KFS 800 MHz – 5 GHz

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

Description

The RGD sheet is made of epoxy resin with carbonyl iron. The standard size is 305×305 mm, thickness from 3.2 to 76 mm, with rods and bars up to 3 inches, and grade RGD-IS-115 does not rust. The material withstands 180 °C and has a tensile strength of 560 kg/cm², a hardness of 85 Shore D, water absorption below 0.1 % per day and a volume resistivity above 10¹¹ Ω·cm. It can be cut with carbide tools, and the dust produced during machining must not be exposed to sparks. KR is the two-part casting version in grades KR-110…KR-124 with a density of 2.1–4.5. The parts are mixed 1:1 and cure for 2 hours at 149 °C, or 4 hours for large castings. KR-…-RT grades cure at room temperature, and below 20–30 GHz KR-117 and KR-124 are preferred.

How to choose

The type is chosen by the shape of the part. Sheets and rods are made of RGD, KR is cast into the housing, flexible heat-resistant gaskets are cast from KRS up to 204 °C, and KFS is available for UHF and the lower microwave range up to 5 GHz. HP and VHP paints on a silicone binder work from −62 to +204 °C. The resins are supplied in kits of 1.35, 2.7 and 11.3 kg; KR keeps for at least 6 months and KRS for 12 months.