Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Are powders hygroscopic?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Pro2A" data-source="post: 1980860" data-attributes="member: 17889"><p>Although I have extensive background in packaging container design and materials, I am not familiar with the specific formulations of powder containers. Plastic containers are not impervious to moisture transmission. There is a Moisture Transmission Rating for each plastic formulation. Polyethylene containers (PE).....ala milk jugs....are pretty much like plastic sieves on the MTR scale......kinda like the Gore-Tex of the plastic world....don't leak, but pass water vapor like a sieve. Even in PE there are many different formulations and moleculear weights with varying characteristics. Newer multi-layer co-formulation containers have much higher MTR. Storing in controlled conditions.......ala 70F; 50% relative humidity.....will greatly contribute to the container contents maintaining characteristics. Stable....non-varying...conditions are very important as well. Containers of 20 years ago are primitive compared to today's specialty formulations. But, PE is still PE. Bottom line......it depends on how they were stored.</p></blockquote><p></p>
[QUOTE="Pro2A, post: 1980860, member: 17889"] Although I have extensive background in packaging container design and materials, I am not familiar with the specific formulations of powder containers. Plastic containers are not impervious to moisture transmission. There is a Moisture Transmission Rating for each plastic formulation. Polyethylene containers (PE).....ala milk jugs....are pretty much like plastic sieves on the MTR scale......kinda like the Gore-Tex of the plastic world....don't leak, but pass water vapor like a sieve. Even in PE there are many different formulations and moleculear weights with varying characteristics. Newer multi-layer co-formulation containers have much higher MTR. Storing in controlled conditions.......ala 70F; 50% relative humidity.....will greatly contribute to the container contents maintaining characteristics. Stable....non-varying...conditions are very important as well. Containers of 20 years ago are primitive compared to today's specialty formulations. But, PE is still PE. Bottom line......it depends on how they were stored. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Are powders hygroscopic?
Top