- For general laboratory work.- Made of super-refined cellulose and linters. Very low ash contents of £ 0.1 % and an a-Cellulose content of above 95 %. A high quality control guarantees constant properties of the grades and therefore reproducible analyti - For general laboratory work.- Made of super-refined cellulose and linters. Very low ash contents of £ 0.1 % and an a-Cellulose content of above 95 %. A high quality control guarantees constant properties of the grades and therefore reproducible analyti