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).
Letter from General Plastics regarding the use of Durez 1606 liquid resin for impregnating asbestos linings.
| Identifier | ExFiles\Box 120\2\ scan0182 | |
| Date | 23th July 1937 | |
| MARTINDALE GENERAL PLASTICS INCORPORATED NORTH TONAWANDA, NEW YORK 1029 DUREZ TRADE MARK REGISTERED July 23, 1937 File Rolls-Royce Ltd. Derby, England Attention: MR. A.{Mr Adams} K.{Mr Kilner} Martindale Gentlemen: We were pleased to receive your letter of July 12th and in reply are sending you under separate cover a 1 gallon sample, free of charge, of our 1606 Liquid Resin which has been used very extensively in this country for impregnating the woven type of asbestos linings. The 1606 is a semi-thermosetting type of resin furnished in extremely heavy liquid form. It is miscible with drying, semi-drying and non-drying oils and is soluble in coal tar solvents, hydro carbons and mineral spirits. At 90°C. it is possible to cut with equal weight of D.M.&C.Naphtha, and cooled to 0°C. with no precipitation, showing that the cheaper grades of solvents are satisfactory. However, toluol is the best solvent for the resin and it may be necessary to use some toluol along with the grade of naphtha you have available in your country. In using the 1606 resin for impregnating asbestos linings, it is usually diluted with from 30-40% of raw China Wood Oil and then dissolved in a suitable hydro carbon solvent. The degree of dilution will depend upon the amount of resin you wish to incorporate in the asbestos fabric, but in general it is diluted to a point that will give between 10 and 15% of resin in the finished lining. The asbestos fabric is pulled through a dipping tank which contains the resin solution and the tank is so designed to give whatever time is necessary to insure thorough impregnation. After impregnation, the lining is then pre-dried at a temperature between 175 and 200°F.{Mr Friese} to eliminate the solvents and then baked for between 4 and 14 hours at 275-300°F.{Mr Friese} to cure the resin. The time of cure will depend upon the thickness of the lining made. It may be that you will obtain better results by not using any additional China Wood Oil with the resin, although this can be used if desired. Raw China Wood Oil would be preferable to polymerized oil, as it will dry quicker in the baking operation. DUREZ PHENOLIC PLASTICS | ||