This part of ISO 10414 provides standard procedures for determining the following characteristics of water-based drilling fluids: a) drilling fluid density (mud weight); b) viscosity and gel strength; c) filtration; d) water, oil and solids contents; e) sand content; f) methylene blue capacity; g) pH; h) alkalinity and lime content; i) chloride content; j) total hardness as calcium. Annexes A through K provide additional test methods which may be used for ? chemical analysis for calcium, magnesium, calcium sulfate, sulfide, carbonate and potassium; ? determination of shear strength; ? determination of resistivity; ? removal of air; ? drill-pipe corrosion monitoring; ? sampling, inspection and rejection; ? rig-site sampling; ? calibration and verification of glassware, thermometers, viscometers, retort-kit cup and drilling-fluid balances; ? permeability-plugging testing at high temperature and high pressure for two types of equipment; ? example of a report form for water-based drilling fluid.