page_title: EPDM rubber
hierarchical_section_title: EPDM rubber
caption_attribution_description: English: A picture of a roll of Carlisle Co.-made EPDM-foil. This foil (used for waterproofing roofs) does not pollute any rainwater running off the foil (unlike other contemporary waterproof foils as bitumen). Having the runoff rainwater unpolluted allows the rainwater to be used by the house owners for their sanitary requirements (which is being done by the owners here). This is known as rainwater harvesting. Note the front and back, which are noticeably different, as well as the part of the foil which is sticky (to attach it unto the roof).
context_page_description: EPDM rubber is a type of synthetic rubber that is used in many applications.
  EPDM is an M-Class rubber under ASTM standard D-1418; the M class comprises elastomers having a saturated chain of the polyethylene type. EPDM is made from ethylene, propylene, and a diene comonomer that enables crosslinking via Sulfur vulcanization. The earlier relative of EPDM is EPR, ethylene-propylene rubber, that contains no diene units and can only be crosslinked using radical methods such as peroxides. Dienes used in the manufacture of EPDM rubbers are ethylidene norbornene, dicyclopentadiene, and vinyl norbornene.
  EPDM is derived from polyethylene into which 45-85 wt% of propylene have been copolymerised to reduce the formation of the typical polyethylene crystallinity. EPDM is a semi-crystalline material with ethylene-type crystal structures at higher ethylene contents, becoming essentially amorphous at ethylene contents that approach 50 wt%.
  Rubbers with saturated polymer backbones, such as EPDM, have much better resistance to heat, light and ozone than unsaturated rubbers such as natural rubber, SBR or polychloroprene.
context_section_description: EPDM rubber (ethylene propylene diene monomer rubber) is a type of synthetic rubber that is used in many applications.
  EPDM is an M-Class rubber under ASTM standard D-1418; the M class comprises elastomers having a saturated chain of the polyethylene type (the M deriving from the more correct term polymethylene).  EPDM is made from ethylene, propylene, and a diene comonomer that enables crosslinking via Sulfur vulcanization.  The earlier relative of EPDM is EPR, ethylene-propylene rubber, that contains no diene units and can only be crosslinked using radical methods such as peroxides.  Dienes used in the manufacture of EPDM rubbers are ethylidene norbornene (ENB), dicyclopentadiene (DCPD), and vinyl norbornene (VNB).
  EPDM is derived from polyethylene into which 45-85 wt% of propylene have been copolymerised to reduce the formation of the typical polyethylene crystallinity.  EPDM is a semi-crystalline material with ethylene-type crystal structures at higher ethylene contents, becoming essentially amorphous at ethylene contents that approach 50 wt%.
  Rubbers with saturated polymer backbones, such as EPDM, have much better resistance to heat, light and ozone than unsaturated rubbers such as natural rubber, SBR or polychloroprene (Neoprene).  As such, EPDM can be formulated to be resistant to temperatures as high as 150 °C, and, properly formulated, can be used outside for many years or decades without degradation.  EPDM has good low temperature properties, with elastic properties to temperatures as low as -40 °C depending on the grade and the formulation.  
  As with most rubbers, EPDM is always used compounded with fillers such as carbon black and calcium carbonate, with plasticisers such as paraffinic oils, and has useful rubbery properties only when crosslinked.  Crosslinking mostly takes place via vulcanisation with sulphur, but is also accomplished with peroxides (for better heat resistance) or with phenolic resins.  High energy radiation such as from electron beams is sometimes used for producing foams and wire and cable.
caption: A roll of EPDM flashing with fleece on the back, used for waterproofing roofs
exif: {"Image Make": "Canon", "Image Model": "Canon PowerShot A95", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image DateTime": "2008:07:01 15:34:42", "Image YCbCrPositioning": "Centered", "Image ExifOffset": "184", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "180", "Thumbnail YResolution": "180", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "2000", "Thumbnail JPEGInterchangeFormatLength": "5711", "EXIF ExposureTime": "1/60", "EXIF FNumber": "7/2", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2008:06:29 14:40:42", "EXIF DateTimeDigitized": "2008:06:29 14:40:42", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "3", "EXIF ShutterSpeedValue": "189/32", "EXIF ApertureValue": "29/8", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "107/32", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, auto mode", "EXIF FocalLength": "77/8", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "1766", "EXIF ExifImageLength": "2150", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "Interoperability RelatedImageWidth": "2592", "Interoperability RelatedImageLength": "1944", "EXIF InteroperabilityOffset": "1852", "EXIF FocalPlaneXResolution": "2592000/283", "EXIF FocalPlaneYResolution": "486000/53", "EXIF FocalPlaneResolutionUnit": "2", "EXIF SensingMethod": "One-chip color area", "EXIF FileSource": "Digital Camera", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF DigitalZoomRatio": "1", "EXIF SceneCaptureType": "Standard"}