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Rifles, Reloading, Optics, Equipment
Gunsmithing
Best Bedding Material
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<blockquote data-quote="Hugnot" data-source="post: 2349698" data-attributes="member: 115658"><p>Not all epoxies exhibit equal temperature tolerance ranges - for example Brownell's Acraglas Gel contains nylon particles ("Nylon Derivatives") to increase viscosity (less drippy) and nylon has a limited working temp not to exceed that of boiling water - not usually seen from normal shooting but what if a heat source was used next to the Acraglas Gel for some purpose and temps exceeded 212F*, how would the Acraglas Gel react? Many quick set epoxies have inadequate strength and limited working time for bedding applications.</p><p></p><p>An explanation from <em>Wikipedia</em> of how the epoxies stick to stuff like to wood & steel:</p><p></p><p><em>"As adhesives, epoxies bond in three ways: a) Mechanically, because the bonding surfaces are roughened; b) by proximity, because the cured resins are physically so close to the bonding surfaces that they are hard to separate; c) ionically, because the epoxy resins form ionic bonds at an atomic level with the bonding surfaces. This last is substantially the strongest of the three.<sup><a href="https://en.wikipedia.org/wiki/Epoxy#cite_note-22" target="_blank">[22]</a></sup> By contrast, polyester resins can only bond using the first two of these, which greatly reduces their utility as adhesives and in marine repair."</em></p></blockquote><p></p>
[QUOTE="Hugnot, post: 2349698, member: 115658"] Not all epoxies exhibit equal temperature tolerance ranges - for example Brownell's Acraglas Gel contains nylon particles ("Nylon Derivatives") to increase viscosity (less drippy) and nylon has a limited working temp not to exceed that of boiling water - not usually seen from normal shooting but what if a heat source was used next to the Acraglas Gel for some purpose and temps exceeded 212F*, how would the Acraglas Gel react? Many quick set epoxies have inadequate strength and limited working time for bedding applications. An explanation from [I]Wikipedia[/I] of how the epoxies stick to stuff like to wood & steel: [I]"As adhesives, epoxies bond in three ways: a) Mechanically, because the bonding surfaces are roughened; b) by proximity, because the cured resins are physically so close to the bonding surfaces that they are hard to separate; c) ionically, because the epoxy resins form ionic bonds at an atomic level with the bonding surfaces. This last is substantially the strongest of the three.[SUP][URL='https://en.wikipedia.org/wiki/Epoxy#cite_note-22'][22][/URL][/SUP] By contrast, polyester resins can only bond using the first two of these, which greatly reduces their utility as adhesives and in marine repair."[/I] [/QUOTE]
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