rcaddict Posted February 22, 2018 Share Posted February 22, 2018 why is aliphatic pva glue yellow , is it dyed ? Quote Link to comment Share on other sites More sharing options...
The Wright Stuff Posted February 22, 2018 Share Posted February 22, 2018 Yes, apparently. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted February 22, 2018 Share Posted February 22, 2018 Straight answer is yes. But that is not to say they are the same. Poly vinyl acetate, PVA, is good glue, but with draw backs (sanding, water resistance.) In the aliphatic resin is another glue mixed in as an emulsion, that undergoes a polymerisation in the drying process. Hence better water resistance, and better sanding performance because it dries hard, whereby PVA is a rubbery substance. Aliphatic is a marketing word. In organic chemistry every thing is aliphatic if it is made of carbon chains. If it is made of rings, it isn't aliphatic. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted February 22, 2018 Share Posted February 22, 2018 Yea Wright Stuff, that bloke sounds like he knows glues. I am happier that I have devoted the hours to studying whiskey Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted February 22, 2018 Share Posted February 22, 2018 Look how suitable it is , quote Aliphatic Resin. Famous "yellow" wood glue used in aeromodelling and professional applocations where hard woods are used; dries crispier than PVA giving better sanding specially with balsawood. Will not pull joints as it sets, resulting in better dimensional stability important for airframe construction. Also sets in low temperature and is water resistant making it ideal for model boats. Edited By Denis Watkins on 22/02/2018 15:15:59 Quote Link to comment Share on other sites More sharing options...
Don Fry Posted February 22, 2018 Share Posted February 22, 2018 As is well known, if you use white PVA glue, it sticks stuff to airframes like Balsaloc. Except, balsaloc works over a number of heat cycles, and the sort of PVA I use works over one heat cycle. BEB has expounded on this forum that he suspects there is little difference between PVA and Balsaloc. I would suggest he may be right, Balsaloc could be a straight PVA, no additives, and being a thermoplastic melts and remelts. My "PVA" is a bit more of a mixture, which undergoes changes when heated Quote Link to comment Share on other sites More sharing options...
Mowerman Posted February 25, 2018 Share Posted February 25, 2018 De-lux models aliphatic resin is white ! Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted February 25, 2018 Share Posted February 25, 2018 A very useful dodge with aliphatic resin glues. With thin sheet such as leading edge sheet if you cover both surfaces with it and leave top dry (NOTE only apply in the area of contact on the LE sheet) you can then iron the sheet down. It takes quite a plot of heat to get through the LE sheet and you can get brown stains on the wood. By laying the seer over the wet glue on the wing you mark where to apply the glue to the sheet. The ironing down polymerises the glue. NOTE this is a once only operation,you can't reheat the assembly Quote Link to comment Share on other sites More sharing options...
Former Member Posted February 25, 2018 Share Posted February 25, 2018 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Don Fry Posted February 25, 2018 Share Posted February 25, 2018 Thank you Peter. Quote Link to comment Share on other sites More sharing options...
NormB Posted February 25, 2018 Share Posted February 25, 2018 Here's an interesting link about heat re-activating PVA / aliphatic glues. It's a loudspeaker building post but it gives re-activation times for FRANKLIN's Titebond glues (available in UK, I use them ) **LINK** This seems to reinforce the ideas that Balsaloc etc are ordinary PVAs (with maybe some additive - they smell a bit different.) Norm Quote Link to comment Share on other sites More sharing options...
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