Glass filled epoxies are excellent mounting compounds for protecting the specimen edges during grinding and polishing.
Glass filled resins can be expensive, so to reduce the cost per mount, it is recommended that the epoxy be used at the specimen interface and then layered with a lower cost mounting compound such as a phenolic. A common combination is red phenolic / glass filled epoxy.
'%3e%3cpath%20d='M30%205.625C36.4647%205.625%2042.6645%208.19307%2047.2357%2012.7643C51.8069%2017.3355%2054.375%2023.5353%2054.375%2030C54.375%2036.4647%2051.8069%2042.6645%2047.2357%2047.2357C42.6645%2051.8069%2036.4647%2054.375%2030%2054.375C23.5353%2054.375%2017.3355%2051.8069%2012.7643%2047.2357C8.19307%2042.6645%205.625%2036.4647%205.625%2030C5.625%2023.5353%208.19307%2017.3355%2012.7643%2012.7643C17.3355%208.19307%2023.5353%205.625%2030%205.625ZM30%2060C37.9565%2060%2045.5871%2056.8393%2051.2132%2051.2132C56.8393%2045.5871%2060%2037.9565%2060%2030C60%2022.0435%2056.8393%2014.4129%2051.2132%208.7868C45.5871%203.16071%2037.9565%200%2030%200C22.0435%200%2014.4129%203.16071%208.7868%208.7868C3.16071%2014.4129%200%2022.0435%200%2030C0%2037.9565%203.16071%2045.5871%208.7868%2051.2132C14.4129%2056.8393%2022.0435%2060%2030%2060ZM43.2422%2024.4922C44.3438%2023.3906%2044.3438%2021.6094%2043.2422%2020.5195C42.1406%2019.4297%2040.3594%2019.418%2039.2695%2020.5195L26.2617%2033.5273L20.7539%2028.0195C19.6523%2026.918%2017.8711%2026.918%2016.7812%2028.0195C15.6914%2029.1211%2015.6797%2030.9023%2016.7812%2031.9922L24.2812%2039.4922C25.3828%2040.5938%2027.1641%2040.5938%2028.2539%2039.4922L43.2422%2024.4922Z'%20fill='%2300A046'/%3e%3ccircle%20cx='30.5'%20cy='29.5'%20r='20.5'%20fill='white'/%3e%3cpath%20d='M21.8175%2037H18.7395L13.5915%2029.206V37H10.5135V24.364H13.5915L18.7395%2032.194V24.364H21.8175V37ZM27.1266%2026.83V29.386H31.2486V31.762H27.1266V34.534H31.7886V37H24.0486V24.364H31.7886V26.83H27.1266ZM51.1749%2024.364L47.8809%2037H44.1549L42.1389%2028.684L40.0509%2037H36.3249L33.1209%2024.364H36.4149L38.2329%2033.562L40.4829%2024.364H43.8669L46.0269%2033.562L47.8629%2024.364H51.1749Z'%20fill='%2300A046'/%3e%3c/g%3e%3cdefs%3e%3cclipPath%20id='clip0_10639_3631'%3e%3crect%20width='60'%20height='60'%20fill='white'/%3e%3c/clipPath%3e%3c/defs%3e%3c/svg%3e)
