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Old May 09, 2005, 04:43 PM
C-MIC is offline
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What is the CHEMICAL NAME of Dope..no one knows dope here...


My question is simply as the title says.
Because aeromodelling, especially homebrew models, is not a popular here in China (I work here), and ARTF is almost the ONLY way to go so that nobody know what dope is. The only hope to get it is to have its CHEMICAL name,..I check the chemical dictionary to translate in Chinese and try to see if it is available from some paint/ chemical shops here.
I have bought many ancient kits from ebays and rc universe. Many of them is not look like what it should be with plastic coverings.
Hope to hear more from you. Thanks in Advance.

David
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Old May 09, 2005, 05:06 PM
Andy W is offline
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You need to find a (full-scale) aircraft maintenance facility.. they'll be able to help you..
..a
Old May 09, 2005, 05:13 PM
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Dope is a solution of a cellulose ester, such as cellulose acetate or nitrate, or a cellulose ether, such as ethyl cellulose or benzyl cellulose, in a volatile solvent, such as acetone, amyl acetate, etc.

Does this help you?
Old May 09, 2005, 09:39 PM
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"volatile solvent, such as acetone, amyl acetate, etc"

most commonly Butyl Acetate these days....

Old May 09, 2005, 10:53 PM
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Dope MSDS


The file is to big to attach (371kb), but you can download the MSDS for AeroGloss dope from this site (and perhaps others):

http://www.msds.com/

Just do a search on "DOPE".

I think I can make my own now
Old May 09, 2005, 11:48 PM
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"nitrate dope" is nitrocellulose (aka gunpowder (but NOT "black powder")) disolved with
appropriate solvents, plasticizers, colorants, and so on. The exact formula is likely to
be somewhat secret, though you should be able to get pretty close. Nitrocellulose
laquers of one sort or another are widely used in industry because of their high gloss
and quick drying properties. The original use in the US was apparently as automotive
paint. "Nail polish" was derived from the auto-paint usage, and is probably still quite
similar in composition to "nitrate dope", although the available colors are likely to be
a bit skewed from what the average modeler would like to have :-)

That all said, I think most model 'dope' in the US is no longer "nitrate" based, probably
due to flamability issues...
Old May 10, 2005, 05:17 AM
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I believe that is what caught fire in the hindenburg arship disater - not the hydrogen itself - at first anyway.

Ethyl acetate springs to mind for some reason. as a dope constituent.

Solvents are not hugely important other than cost/flammability/carcinogenic properties.

I cannot believe that a suitable mixture does not exist in hong kong...

Butyrate is more common these days is it not? less shrink, less burnable.
Old May 10, 2005, 07:24 AM
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At my place of work, they use butyl-acetate as a thinner and cleaner for conductive silver paint used to "trim" precision potentiometers.... one stroll through the production area and your nose will tell you this is the solvent.... that is, if you remember what Ambroid glue and Perfect tanks are

Old May 10, 2005, 09:08 AM
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If you're looking for nitrate dope,it's often also sold(and labeled) as a wood grain filler(on a nitro cellulose basis).
Old May 11, 2005, 09:42 AM
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I live in Hong Kong and while not exactly "old school", I love the feel of dope on my fingers. ARF is the rage here and I spent countless hours looking for nitrate dope and it simply does not exist. I found some old SIG dope in a store but it was colored and a chance find. I smelt some "Giraffe" brand (don't laugh) floor sealer here and it smelt like dope so I bought some as well as a lot of thinner and it sort of worked but had very little tightening properties. An option (albeit expensive) is simply to mail order some from the States and as long as you are willing to pay the dangerous cargo premium, it will turn up on your door. As I said, there isn't much of a market here and while there is probably some industrial market for dope as we know it, the language barrier is simply impenetrable. You have to live here to understand!
Old May 12, 2005, 09:54 AM
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Quote:
Originally Posted by vintage1
Butyrate is more common these days is it not? less shrink, less burnable.
Nitrate is used to glue the fabric the frame.
Butyrate is used to both shrink the fabric and provide a fuel proof finish.

Neither is a viable substitute for the other.
Old May 12, 2005, 04:54 PM
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Partial MSDS for butyrate dope :

SECTION II- HAZARDOUS INGREDIENTS/ SARA
III INFORMATION


OCCUPATIONAL VAPOR
REPORTABLE COMPONENTS EXPOSURE LIMITS WT. %
PRESSURE TOXICITY DATA

Methyl Ethyl Ketone.*(CAS# 78-93-3) 200 PPM
31.45 70mmHg .@200C Narcotic by inhalation

Ethyl Acetate.*(CAS# 141-78-6) 400 PPM
37.16 75mmHg @200C Mod.Inhalation.

Butyl Acetate.*(CAS# 123-86-4) 150 PPM
13.29 10mmHg @200C Mod.Skin irritant.

Diacetone Alcohol.*(CAS# 123-42-2) 50 PPM
10.18 .81mmHg @200C Mod.Skin irritant.
Old May 13, 2005, 06:35 AM
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AeroGloss Dope MSDS ingredients


Made a jpg of the Adobe file.
Old May 16, 2005, 11:26 PM
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You can buy it by the quart (US) or Gallon(US) from aircraft-spruce.com
Old May 17, 2005, 05:32 AM
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"I have bought many ancient kits from ebays and rc universe. Many of them is not look like what it should be with plastic coverings."

Use modern films like:
http://www.modelresearchlabs.com/usi...materials1.htm
http://www.modelresearchlabs.com/mylarcovering.htm
http://www.modelresearchlabs.com/polyspan.htm

Use automotive spray paint (thin) other than dope.


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