I propose to study the far infrared spectrum of a number of bright planetary nebulae in the LMC. SWS will be used to measure line fluxes of several emission lines. The continuum underneath the line will be determined with PHOT-S. The data will be used to determine improved abundances for especially neon, which is an important tracer for stellar dredge up. Models for the nebulae will be constructed to reproduce both the observed optical and IR spectra and the dust spectral energy distribution. I will test why LMC PN appear to have hotter dust than Galactic PN. For one object, which in the past few years has suffered a helium flash, dust formation in the hydrogen-poor wind will be studied. This object gives a unique opportunity to study the effect of a rare late helium flash, as it is only the second time such a flash has occured in an observable star this century.