Adhesives-Cyanoacrylates.

[wonwinglo]

Since we last spoke about this adhesive some new facts have emerged worth noting here for reference-

Whilst this 'miracle' adhesive of our time has changed our model building there have been considerable improvements in the chemical properties of this range of adhesives,for the aeromodeller its main attraction is the weight saving properties it carries due to the miniscule amount needed,the very thin variety needs special care as it has very deep searching properties,in fact controlling it is the biggest problem.

A good use for cyno as we now call it for short is the practise of 'liquid pinning' this entails using ordinary conventional adhesive but spot glue between with cyno to really grab the joint and thus hold the joints while you carry on building.

Sadly the so called odourless varieties are distinctly lacking in adhesive qualities thus making it counter productive in use,perhaps the chemists are working on this to combine a lack of odour with adhesion for the future ?

Alongside the adhesives come a range of rocket accelerators and fillers,for the latter ordinary baking powder will do the trick nicely,just add the powder to the joint for extra powerful joints,this is of particular use when repairing models sometimes where a joint has become oil soaked and requires a bit of persuasion.

The spray on accelerators are handy for when holding an awkward joint is required and above all difficult to hold into place.

[Guest]

Barry,

Ref your article covering Cyno and clearing the tip with heat. Cyno plus heat gives off a gas called cyinide, very toxic so watch what you are doing with that stuff.

[Guest]

Agreed George ,good point. In normal use the gas given off is also a health hazard. Gives the symptoms of a cold, stuffy nose,runny eyes etc but a cyanide component in the stuff may have further serious consequences. Anybody with medical knowledge? Well ventilated work space etc,of course, but we all tend to ignore warnings until it is too late. How many of us have an extractor fan ? Balsa dust IS another item we forget about too easily.....says he, on 60 fags a day!:hammer:

[wonwinglo]

Barry,Ref your article covering Cyno and clearing the tip with heat. Cyno plus heat gives off a gas called cyinide, very toxic so watch what you are doing with that stuff.

*** Valid point George,due to this it is not recommended to clear the needle with heat,better to just change the needles,much safer so be safe and take note of what George has told us,thanks again.

[wonwinglo]

Tutorial has been ammended accordingly.

[wonwinglo]

Agreed George ' date='good point. In normal use the gas given off is also a health hazard. Gives the symptoms of a cold, stuffy nose,runny eyes etc but a cyanide component in the stuff may have further serious consequences. Anybody with medical knowledge? Well ventilated work space etc,of course, but we all tend to ignore warnings until it is too late. How many of us have an extractor fan ? Balsa dust IS another item we forget about too easily.....says he, on 60 fags a day!:hammer:[/quote']*** Interesting thing that about balsa dust,wonder what the long term effects of balsa dust inhalation are ? without being alarmist it makes one wonder ? the old Solarbo advertisements used to tell us about the by-products of balsa,one was that the dust was used in cattle fodder !! no doubt the reclaimed board specialists use all sorts of things including balsa dust,not much goes to waste these days.

I believe the older plastic woods (pre acrylic formulae that is ) used balsa dust as a constituent and wartime magazines advertise a 'plastic balsa' filler once available in tubes.

But does anyone know about the dangers of balsa dust and is there any written notes on this ? with todays risk analysis surely there must be something ?

[Guest]

I would imagine ANY dust in the lungs would lead to resperatory problems. Balsa dust will affect asthmatics. Paint, most types, or "coatings" as they are now called, give off particles in suspension (fumes) and epoxy spraying is considered a grade one hazard in industry. We dice with death in the "ordinary" thing we use in modelling never mind the razor blades,whirling props,crashing planes. Our fuel (methanol) is an absorbsion poison and we casualy wipe it off our hands with a rag ! Geez...wish I could give up smoking, makes me so depressed/depressing. Oh well back to the building board .:dontknow:

[wonwinglo]

Thanks Duncan,as someone once said to me you just dont know what you breathe in these days from industrial waste polluting the air,I can vouch for the methanol as after years of contact I now have a bad skin complaint on my hands which will just not go away,my power models are grounded and hangar bound until it clears,I can only fly electric at the moment due to this but I am still keeping my fingers crossed that one day I can get them flying again.

I suppose if we worried about these things then we would not get any modelling done at all ? I still think we do not know the full effects on the world from the Chenobyl accident,they are only telling us half the story,so keep on modelling everyone but do take care with these volatile products we use.

[Guest]

But Guys, If we were to obey all the health warnings that are now put onto everything then we would be sitting in an airtight vacuum breathing oxygen from a cylinder and going nuts. The nanny staet has got a hell of a lot to answer for. Let common sense prevail and still enjoy what we do for a hobby

Nil Illigitum Carborundum

[Guest]

No such thing as "common sense" George. Common sense told the Victorians that man would never fly, before that witches should be burned at the stake etc etc. I`m for taking a bit of a risk as long as the odds are in my favour but as the saying goes "the more we know, the more we know how little we know". I blame the ambulance chasers and lawyers for a lot of the mambee-pambee rules. A lot of it isnt for your good,it is to cover their bums if you sue. Have you seen the "product liability" labels on American goods. Who said "when I come to power,I`m going to kill all the lawyers" ? Well I suppose I`ll be hearing from my lawyer in the morning if he reads this. On the Nuke issue, if it was so safe why was the experimental reactor put at Thurso and the Windscale complex put in Cumbria. Surely the Isle of Dogs or Buckinghamshire would have saved erection all those unsightly pylons stretching the length of the country. The Irish and Scandinavian countries are not pleased. End of rant, must be the weather ! Havent flown since Thursday.:ranting2: