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 British Belting & Asbestos Ltd concerning the frictional properties and performance of 'Mintex' and 'Halo' brake linings.
| Identifier | ExFiles\Box 120\2\ scan0086 | |
| Date | 8th October 1936 | |
| X1029 Martindale BRITISH BELTING & ASBESTOS LTD. TELEPHONE: HOP 0192 (4 LINES). TELEGRAMS: INDUSTRIAL DEPT. SCANDINAVIA BOROH LONDON AUTO DEPT. SCANDINAVIA BOROH LONDON ASBESTOS DEPT. AMIANTE BOROH LONDON EXPORT DEPT. SCANDILEX LONDON ALL CODES. 59 SOUTHWARK STREET LONDON S.E.1 WORKS: CLECKHEATON, YORKS. TELEPHONE 318. TELEGRAMS: BELTING, CLECKHEATON. Messrs. Rolls-Royce Ltd., Nightingale Road, DERBY. For the attention of Mr. Robotham. YOUR REF. OUR REF. RH{R. Hollingworth}/NB/AUTOS. 8th October. 1936. Dear Sirs, The frictional variations in brake lining are a matter of serious concern to both manufacturers and users of motor vehicles. Our "Mintex" range of brake linings enjoy the reputation of being reliable under all conditions. Not so the "Halo" range which when originally produced was deservedly popular on account of its very high friction value and for its remarkable "sweetness" of action which has never been equalled. The original "Halo", in common with other linings having a synthetic resin content, was rather prone to fade at high temperatures, but where these do not occur it still reigns supreme. No less than 95% of British aeroplane brakes are fitted with "Halo". It is also extensively used for friction materials working in oil. It replaces the bronze washers on steering swivels, etc., where it affords light damping whilst maintaining a uniform condition of lubrication over considerable periods. We now make a "Halo" Lining which maintains a stable friction throughout its life and over the extreme temperature range encountered in modern automobile designs. The friction value of this improved form of "Halo" is .36 - .38. This represents a reduction in the value of the original product but is in accord with the enhanced efficiency of modern actuation systems and gives quieter and smoother performance than do higher friction materials. It is appreciably less affected by water than competitive types of brake lining having equal friction values and is free from objectionable fumes or smell at high temperatures. Its wearing qualities place it in /CONTINUED. | ||