If the try to smear the ashes and they are very smooth, it probably is EPDM. If the ashes are dry and hard you might have SBR or other types of rubber. If there is contact with glass, you might want to test contact staining. Thanks very much Metten for your response. There is no contact with glass. The EPDM parts will be in contact with galvalume sheet of 0.
Are there any safety concerns when burning the rubber? Just cut a very small strip: few centimeters long, few millimeters thick. Burn that for seconds and extinguish. You should have enough ashes to drop on a paper without the paper catching fire.
By the time someone alerts your safety personel, you can get rid of the paper and open a window, only the sooted finger is left as evidence. There are more elaborated tests to distinguish the different types CR, NBR etc, but it sometimes requires to inhale the fumes and I don't encourage that. We have safety masks in the factory and a lab with a chimney and an fume extractor. Burning the samples might just be okay.
EPDM peroxide: often distinct smell not burnt! The smells might need an experienced nose. I just burn the mini samples behind my desk. I wait for my colleague, the safety coordinator, to leave the room so that he doesn't have the burning smell. Open a window after burning. I burn less then half a gram of rubber. Please, please, please, both of you, be very careful when burning NBR rubber because the combustion products will contain carbon dioxide, carbon monoxide, and more especially hydrogen cyanide.
I forgot to mention in my previous post that any Neoprene CR based compound will self-extinguish after a few seconds usually when the heat source is removed. EDPM does a great job of withstanding steam and low and high temperatures, though silicone can take on even higher temperatures.
You should also never use EPDM with oils, greases, hydrocarbon fuels, concentrated acids or halogenated solvents.
Finally, EPDM has a shorter life span than Silicone, so depending on the application, it will need replacing more often. Silicone is food safe. Consequently, it offers vast possibilities. Most manufacturers list its water resistance as excellent, but its water swell resistance is generally poor.
Silicone can be modified to stand up to water, as seen by such products as silicone sealants. The U. While Silicone has good tensile strength, its abrasion resistance is generally poor. Note — it can be formulated to improve its tear resistance, however. Grommets that isolate vibrations while providing an airtight dust and watertight seal.
Sealing gaskets are used on metal sheets, providing an extra seal while isolating vibrations and keeping enclosures free of dust and water. Open hole grommet that turn metal into smooth openings for cables to pass through. Flexible top bubble gasket can be pressed by hand or automation. Tight seal of Easy pull masking caps prevents paint ingress. Quick to apply and remove. Single flipper gaskets create a weather seal around vents, doors and other openings.
Flexible profiles can be applied by hand. Protects against vibrations. Silicone properties include elongation, good thermal conductivity, and high resistance to very high temperatures make it a versatile material.
This type of rubber is only sensitive to fats and mineral oils. Technical data for our EPDM rubber sheets can be found here. Nitrile butadiene rubber NBR is characterised by a very high resistance to lubricating oils, however resistance to fuels can only be achieved by special admixtures. NBR is only partially resistant to polar solvents, such as acids and alkalis. Therefore, NBR is usually used when the material is in constant contact with oil and other mineral oil-based greases.
The cold resistance of this elastomer can be influenced by certain additives, but the weather and ozone resistance of NBR is comparatively low. Take a look at our complete range of industrial rubber and rubber sheets. Rubber Sheets made of styrene butadiene rubber SBR are easy to get hold of and an inexpensive alternative to EPDM sheets, which are ideal for indoor use.
The weather and ozone resistance of SBR sheets is significantly poorer when compared directly with EPDM rubber, however the temperature resistance is similar, but keep in mind that SBR has a very low flame resistance. Take a look at our range of industrial rubber sheets.
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