A high-resolution (0.002 cm-1) infrared absorption spectrum of methylene fluoride-d2 (CD2F2) of the lowest fundamental mode ν4 in the region from 460 to 610 cm-1 has been measured on a Bruker IFS 120-HR Fourier transform infrared spectrometer. More than 3500 transitions have been assigned in this B-type band centered at 521.9 cm-1. The data have been combined with upper state pure rotational measurements in a weighted least-squares fit to obtain molecular constants for the upper state resulting in an overall standard deviation of 0.00018 cm-1. Accurate value for the band origin (521.9578036 cm-1) has been obtained and inclusion of transitions with very high J (≤60) and Ka (≤34) values has resulted in improved precision for sextic centrifugal distortion constants,in particular DK, HKJ , and HK.