AbstractThe prolonged exposure of palm kernels to 81% R.H. and above at 25°c. IS conducive to mould growth. A satisfactory steriliention technique involving the use of methyl bromide was developed and shown to be without prejudice to determination8 of relative humidity‐moisture regain‐ relationships.Hygroscopic equilibria between the gas and solid phases were measured at 25°c. over the range 0 to 100% R. H. (with particular reference to the range 50% to 100%) for samples of paln kernels, of jute sacking contaminated with palm kernel fat, and of uncontaminated sacking of a similar type. The sterilisation procedure was utilised at and above 81% R. H.