Tying to identigy a chloroprene ( neoprene ) family member
Tying to identigy a chloroprene ( neoprene ) family member
(OP)
I have a project I am doing NOT for school I am in high school at the moment.
As the tittle suggest the project requires a sheet of an unknown family member of the chloroprene family.
I have narrowed it down to The G-type sub species. I am including 4 pictures of the rubber which needs to be I.D.
Properties of this member are good resilience, compression set, age resistance, vibration dampening. Lastly can anyone of these members be made into a foam as the pictures suggest?
Pictures
http://imgur.com/lv7fK,lDAMh,pnZA1,hkhp6#3
As the tittle suggest the project requires a sheet of an unknown family member of the chloroprene family.
I have narrowed it down to The G-type sub species. I am including 4 pictures of the rubber which needs to be I.D.
Properties of this member are good resilience, compression set, age resistance, vibration dampening. Lastly can anyone of these members be made into a foam as the pictures suggest?
Pictures
http://imgur.com/lv7fK,lDAMh,pnZA1,hkhp6#3





RE: Tying to identigy a chloroprene ( neoprene ) family member
Secondly, it is almost impossible to have good resilience AND vibration damping as these are more or less mutually exclusive (you can have both at the same time).
The chances are that it is a g-type simply because this family is more popular than the w-types. The website below will give you a great deal of information regarding Neoprene.
RE: Tying to identigy a chloroprene ( neoprene ) family member
The project I am working on is to replicate a commercial speaker. The album of pictures above is a speaker and the rubber is between the vibrating diaphragms. which family member you'd you choose for this application?
RE: Tying to identigy a chloroprene ( neoprene ) family member
http://www.dupontelastomers.com/literature/neopren...
http://www.dupontelastomers.com/products/neoprene/...
RE: Tying to identigy a chloroprene ( neoprene ) family member
RE: Tying to identigy a chloroprene ( neoprene ) family member
Why are you thinking about Chloropene and these grades?
The photos you sent are little difficult to see, but for me appears more to be a foam, than actually a sponge.
The density will be related not just to the material grade, but much more to the recipe itself. And if the part is actully a sponge, the density will not be probably 1.20.
The different between the CRs are much more related to the crystalization speed and resistance to cold.
I was to be to design the piece, without looking further on other properties, as stiffness, deflection, etc, I would go with "W" grades specially due the storage shelf life (the G is more scorchy --> starts to cure faster, increase the viscosity). Also the W family has better compression set resistance.
To differenciate between the familys, probably a GC could identify the presence of sulfur or mercaptan. But I don't thing easily you could do it among the same family...
Daniel Cortarelli
Polymer Materials'Engineer
RE: Tying to identigy a chloroprene ( neoprene ) family member
About the images being difficult to see did you try zooming in all the way?
I know for a fact the rubber in the images is a chloroprene family member, I got this information straight from the company who produces these speakers. I don't think DuPont released any more information such as the mechanical properties. So after all this and for the given application, as a surround for a speaker. The surround is meant to 1: allow motion 2: dampen the vibration of the diaphragm so the vibrations don't reverberate and 3: be light enough to not inhibit the movement of the diaphragm since. The best Dampener of the chloroprene family is W-types due to their high viscosity.