D1429-13 – Standard Test Method Technical Guide

ASTM D1429-13 defines standardized procedures for the determination of specific gravity in water and brine, specifically excluding those containing separable oil. Specific gravity is a fundamental fluid property related to density and viscosity, allowing direct comparison of a fluid’s mass characteristics against a standard—typically pure water—at a defined temperature. To accommodate a broad spectrum of sample matrices, from pristine clear waters to dense brines and sludge, the standard outlines four distinct test methods: A (Pycnometer), B (Balance), C (Erlenmeyer Flask), and D (Hydrometer).

ℹ️ Scope and Applicability

The scope of D1429-13 is carefully delineated by sample condition. Test Methods A and B are designated for clear waters or those containing only a moderate amount of particulate matter. Test Method B is explicitly preferred for samples of sea water or brines, offering superior sensitivity over Test Method D, which generally applies to the same matrices. Test Method C is the chosen method for samples containing significant mud or sludge. It is the user’s responsibility to ensure the validity of these test methods for waters of untested matrices. Sampling must be conducted in