MATERIALS, ADHESIVES AND COATINGS
C-BOND 245 / C-BOND 255, epoxy and silicone adhesives for mounting radar absorbers (−55…+230 °C)
Country: · Model: C-BOND 245 / C-BOND 255
Two-component adhesives for mounting radar absorbing materials, also suitable for metals, plastics, glass and ceramics. C-BOND 245 is a flexible epoxy adhesive for the range from −55 to +120 °C, and C-BOND 255 is a transparent silicone for −55…+230 °C.
- C-BOND 245
- flexible cold-curing epoxy adhesive; A:B = 70:100 (flexible), 100:100 (semi-rigid, standard), 100:50 (rigid)
- C-BOND 245, temperature
- −55…+120 °C (−70…+250 °F)
- C-BOND 255
- two-component heat-curing silicone adhesive; A:B = 10:1 by weight; transparent
- C-BOND 255, curing
- 4 h at 120 °C or 2 h at 175 °C; pot life of the mixture ≥ 8 h
Technical specifications
| C-BOND 245 | flexible cold-curing epoxy adhesive; A:B = 70:100 (flexible), 100:100 (semi-rigid, standard), 100:50 (rigid) |
|---|---|
| C-BOND 245, temperature | −55…+120 °C (−70…+250 °F) |
| C-BOND 255 | two-component heat-curing silicone adhesive; A:B = 10:1 by weight; transparent |
| C-BOND 255, curing | 4 h at 120 °C or 2 h at 175 °C; pot life of the mixture ≥ 8 h |
| C-BOND 255, properties | −55…+230 °C; 50–60 Shore A; 25 kV/mm; 10¹⁴ Ω·cm; ε = 4, tan δ 0.02 (10²–10¹⁰ Hz) |
| Packaging | kits ≈ 0.46 / 0.91–0.95 / 3.6 kg |
| Storage | ≥ 6 months at room temperature |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The seam stiffness of C-BOND 245 is regulated by the amount of hardener. A ratio of 70 parts A to 100 parts B gives a flexible seam, 100 to 100 a semi-rigid one (this is how the components are supplied), and 100 to 50 a rigid one. The adhesive is designed for impact, shear and peel, cures at room temperature, and is used to bond urethane absorbers such as FLX-U-800. C-BOND 255 is an addition-cure silicone that needs neither air nor moisture. The components are mixed 10:1 by weight, and the mixture is vacuumed to remove air that expands on heating. Curing takes 4 hours at 120 °C or 2 hours at 175 °C, and the pot life of the mixture is not less than 8 hours. It is the standard adhesive for the silicone sheet absorbers FLX, GDSS, FGMM, FFS-125 and RGD-S, and the metal under it is coated with the C-PRIME 215 primer. After curing, the seam has 50–60 Shore A, a dielectric strength of 25 kV/mm, a volume resistivity of 10¹⁴ Ω·cm, a dielectric constant of 4 and a loss tangent of 0.02 in the range from 100 Hz to 10 GHz.
How to choose
The choice depends on temperature and absorber type. Up to +120 °C and for urethane absorbers take the epoxy C-BOND 245, and for silicone sheets and operation up to +230 °C the silicone C-BOND 255. Kits of parts A and B weigh about 0.46, 0.95 (245) or 0.91 (255) and 3.6 kg, and non-standard ratios and large packaging are supplied on request. The shelf life in closed packaging at room temperature is not less than 6 months.
Request a price and lead time
C-BOND 245 / C-BOND 255, epoxy and silicone adhesives for mounting radar absorbers (−55…+230 °C). We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
In what ratios is C-BOND 245 mixed?
70 to 100 gives a flexible seam, 100 to 100 a semi-rigid one, and 100 to 50 a rigid one. The standard supply is semi-rigid.
What is the curing schedule of C-BOND 255?
4 hours at 120 °C or 2 hours at 175 °C. The pot life of the mixture at room temperature is not less than 8 hours.
What temperature range do these adhesives have?
C-BOND 245 works from −55 to +120 °C, and C-BOND 255 from −55 to +230 °C.
Is a primer needed under C-BOND 255?
For joint durability the metal is first coated with the C-PRIME 215 silicone primer.
What dielectric parameters does C-BOND 255 have?
Dielectric strength 25 kV/mm, dielectric constant 4, loss tangent 0.02 in the range from 100 Hz to 10 GHz.
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