Reducing Epoxy Outgassing Rates
3. The authors tested various surface treatments on epoxy samples to reduce the outgassing rate , including an aquadag coating, vacuum evaporated aluminum coating, and cladding with aluminum or stainless steel foil, and found reductions by factors of 5 to 20.
In the context of cured epoxy resins, outgassing in a vacuum is primarily due to the release of residual volatile components from the resin and hardener, as well as absorbed atmospheric gases like water vapor. The rate of outgassing is dependent on the material's formulation, cure schedule, and the temperature and pressure of the environment.
PDF Degassing of vacuum materials and its reduction
How effective are coatings in reducing outgassing and permeation rate ? In materials made of several layers the total permeability depends on the permeability and thickness of each layer through the equation:
This document summarizes research on the outgassing of epoxy resins in a vacuum . Three plastic materials were tested - two glass-fiber filled epoxies and an unfilled epoxy . The materials were exposed to vacuum between 10^-7 to 10^-10 torr at 24°C and weight loss over 100 hours was measured. Weight loss decreased over time, indicating absorbed or adsorbed gases were released. Qualitative ...
PDF Outgassing
Permeation — this is the movement of molecules from the external atmosphere through the bulk to the vacuum surface The extent to which each of these afects outgassing depends on the composition of both the gas and the surface material (and its history). Outgassing rates are a sum of these contributions.
This technical guide provides an in-depth analysis of the outgassing properties of G907 epoxy in vacuum environments. The following sections detail quantitative outgassing data, the standardized experimental protocol used for its measurement, and a visual representation of the testing workflow. This information is critical for applications where minimal outgassing is required to prevent ...
PDF Four Ways to Reduce Outgassing in Vacuum Systems
There are four main ways you can reduce outgassing in your vacuum system. These are: cleaning and handling (bakeout), surface treatment, passivation, and purging and backfilling. In this Application note, we will take a closer look at each of these methods.
It was found that outgassing rate can be reduced by an aquadag coating (by a factor of 5), by a vacuum evaporated aluminium coating (by a factor of 10) or by cladding with aluminium or stainless steel foils (by a factor of 20). However, these surface treatments would obviously affect the surface dependent electrical properties of the epoxy .
(PDF) A Review of Outgassing and Methods for its Reduction
This article aims to review the outgassing process, outgassing rates , measurement methods and techniques that can be used to reduce the outgassing of a system.
The right choice of materials and treatments is compulsory in the design of vacuum systems (especially those for accelerators). In this respect the measurement of outgassing rate is an essential activity for an ultra-high vacuum expert.