TAPPI T 1218 SP 2012

TAPPI T 1218 SP-12 provides a standardized procedure for calibrating reflectance standards for hemispherical geometry against a theoretically perfect reflecting diffuser. It covers the use of an integrating sphere and auxiliary sphere, preparation of coated spheres and flat plates, spectrophotometer measurements, reflectance calculations, reporting requirements, and factors affecting accuracy. The practice is intended for technical professionals working with optical measurements, paper industry testing, spectrophotometry, and reflectance standardization.

Application Scope: Calibration of instrument reflectance standards using diffuse-diffuse hemispherical geometry in paper, pulp, optical measurement, and related laboratory applications.