4U 1812–12 is a faint persistent and weakly variable neutron star X-ray binary .
It was observed by BeppoSAX between April 20th and 21st , 2000 in a hard spectral state with a bolometric luminosity of \sim 2 \times 10 ^ { 36 } ergs s ^ { -1 } .
Its broad band energy spectrum is characterized by the presence of a hard X-ray tail extending above \sim 100 keV .
It can be represented as the sum of a dominant hard Comptonized component ( electron temperature of \sim 36 keV and optical depth \sim 3 ) and a weak soft component .
The latter component which can be fitted with a blackbody of \sim 0.6 keV and equivalent radius of \sim 2 km is likely to originate from the neutron star surface .
We also report on the first measurement of the power density spectrum of the source rapid X-ray variability , as recorded during a simultaneous snapshot observation performed by the Rossi X-ray Timing Explorer .
As expected for a neutron star system in such hard spectral state , its power density spectrum is characterized by the presence of a \sim 0.7 Hz low frequency quasi-periodic oscillation together with three broad noise components , one of which extends above \sim 200 Hz .