D3078 Pdf 2021 — Astm

To improve bubble visibility, the standard recommends using a wetting agent (surfactant) in the water. The 2021 update includes more specific instructions on surfactant concentration and water temperature to ensure repeatability across labs.

+--------------------------------------------------------+ | VACUUM PUMP CONTROL | +--------------------------------------------------------+ | v +------------------------+ | VACUUM CHAMBER CAP | +-------------+------------------------+-------------+ | | | | | | AIR HEADSPACE | | | | | | | +------------------------+ | | | :::::::::::::::::::: | | | | :: SUBMERSION FLUID ::| | | | :::::::::::::::::::: | | | | +-------+ | | | | | TEST | | | | | | ITEM | | | | | +-------+ | | | +------------------------+ | | | +----------------------------------------------------+ Core Objectives astm d3078 pdf 2021

A clear, rigid container (usually acrylic) that can withstand a vacuum. To improve bubble visibility, the standard recommends using

A vacuum is drawn, lowering the pressure inside the chamber. A vacuum is drawn, lowering the pressure inside the chamber