From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Schedule of uses, tests, and suitable types of untreated electrical insulating papers.
| Identifier | ExFiles\Box 24\2\ Scan246 | |
| Date | 30th January 1923 guessed | |
| ELECTRICAL INSULATING PAPERS (UNTREATED). 667 IV. SCHEDULE OF USES, TESTS AND PAPERS. A cross indicates that the test as described in the Specification shall be carried out. Uses Tests GENERAL TESTS Determination of Thickness Determination of Density Tensile Strength and Extension Ageing Tearing Strength Porosity Moisture Loss on Drying CHEMICAL TESTS Acidity and Alkalinity Mineral Ash Sizing Chemical Test for Metallic Particles Flash Test for Conducting Particles Microscopical Examination Description of Suitable Papers in General Use 1. PAPERS USED AS INSULATION: Manufacture of tubes and sheets Tests: X X X X X X X X X X X — X Paper Type: Chemical Wood-pulp Between layers of windings and similar purposes Tests: X X X X X X X X X X X X X Paper Type: Chemical Wood-pulp, Manilla, Jute, Rag Bond, Best Rag Tissue Insulating wrappings .. .. Tests: X X X X X X X X X X X X X Paper Type: Chemical Wood-pulp, Manilla, Jute Between punchings .. .. Tests: X — — — — — — — — — — — X Paper Type: Chemical Wood-pulp, Mechanical Wood-pulp Condensers .. .. .. .. Tests: X X X X X X X X X X X X X Paper Type: Condenser or Electrical Tissue 2. PAPERS USED AS INSULATION AND AS MECHANICAL PROTECTION: Slot insulation .. .. .. Tests: X X X — X — — X X — X — X Paper Type: Manilla (Red), Red Rope, Jute, Leather Wrapping core bolts.. .. Tests: X X X — X — — X X — X — X Paper Type: Manilla (Red), Red Rope, Jute, Leather Bobbin flanges and other parts where high insulation is not required Tests: X — X — X — — X X — — — X Paper Type: Manilla (Red), Red Rope, Jute, Leather 3. PAPER USED AS A MECHANICAL SUPPORT IN BUILDING UP INSULATING MATERIALS: Backing for mica-folium, mica tape or micanite Tests: X — X — X — — — X — — — X Paper Type: Chemical Wood-pulp, Manilla, Japanese Kodzu Tissue, Japanese Dental Tissue, Sulphite Imitation Japanese Tissue Covering for micanite .. Tests: X — — — — — — X — — — — X Paper Type: Sulphite Tissue | ||