High - higher than standard in diploma or depth or amount; "a high temperature"; "a high value"; "the high place of his career"; "high hazards"; "has high hopes"; "the river is high"; "he provides a high opinion of himself" concluded that HPMC can be deemed Risk-free for human use.one Nevertheless, https://hpmc-for-tile-adhesive65297.birderswiki.com/1516768/not_known_facts_about_hpmc_for_tile_adhesive