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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).
Use of Bestobell Asbestos Blanket and other materials for noise insulation, focusing on water absorption issues.

Identifier  ExFiles\Box 138\1\  scan0146
Date  26th March 1935
  
x634
Run

W/S.
To Cx.{Major Len W. Cox - Advertising Manager} from E.{Mr Elliott - Chief Engineer}
E.3/HP.26.3.35.

c. Sc. Hor. Hs.{Lord Ernest Hives - Chair} Ev.{Ivan Evernden - coachwork} Roy.{Sir Henry Royce} LV. Hs{Lord Ernest Hives - Chair}/WYM.{G. Harold Whyman - Experimental Manager}

re Bestobell Asbestos Blanket.

Thank you for Cx.{Major Len W. Cox - Advertising Manager}1/KW/26.3.35 and samples. I have seen these before, and I am passing them on to Hs{Lord Ernest Hives - Chair}/WYM.{G. Harold Whyman - Experimental Manager}

I think one of the difficulties we shall have to contend with in this noise insulation scheme will be the effect of moisture on the material used. We have found in the past that the use of felt in tool boxes placed on the running boards was most unsatisfactory. This was owing to water getting in, either from rain or washing, probably the latter and setting up an impossible state of mildew and rust.

In the case of panelling adjacent to lifting windows we have specified Silento, as previously mentioned, but this may not give the required effect. We might use a layer of felt covered with a thin layer of rubber in such places such as we are using under the foot mats, the rubber and felt being stuck together, and the combination being mounted adhesively on the panel, with the rubber on the outside. The Bestobell samples do not help us with this particular problem, but they may be applicable in the more protected parts of the lining.

This question of water absorption might be looked at in two ways, firstly, in the exposed places such as opening windows and sunshine roof shields, we want something which will not absorb water by direct contact. Secondly, for the general anti-noise lining we should prefer a material with a non-hygroscopic matrix which would thereby absorb less moisture and should not be liable to set up mildew and unpleasant odours. In this second category it is possible that rubber impregnated asbestos blanket may be superior to felt provided
  
  


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