ASTM E471-22

Annotation of standard text ASTM E471-22 :

This test method covers the determination of the char density profile of a charred ablator. The total thickness of the char and degradation zone must be larger than the machining thicknesses required. Density variation throughout a charred ablator material is determined by successively measuring, machining, and weighing a sample of known size to obtain the density of the material removed by machining. The apparatus required for this method includes a laboratory balance capable of measuring to the nearest ten thousandth gram, and a machining technique capable of removing material in increments as small as a thousandth mm.


Keywords:
ablation, char density, density profile ,, ICS Number Code 49.025.40 (Rubber and plastics)