Tuesday, January 06, 2009
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Resistance of Plastics to Gamma Irradiation

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Ratings

++++       Excellent
+++ Good
++ Satisfactory
+ Weak
- Unsatisfactory
Material
Type Stability Dose
Polyurethane rubber ++++ 100-200
Natural rubber +++ 100
SBR (Styrene Butadiene Rubber) +++
Nitrile rubber +++ 200
NBR (Nitrile Butadiene Rubber) ++
Polybutadiene +++
Acrinolitrile butadiene copolymer +++
Silicone rubber ++/+++ 50 to 100
Neoprene rubber (polychloroprene) ++/+++
Isobuthylene-isoprene copolymer ++
Polyisoprene +++
EPR (Ethylene Propylene Rubber) +++
Vinylidene fluoride / hexafluoro propylene rubber ++
Trifluoro chloro ethylene +++
Butadiene-vinylpiridine copolymer +++
Chloroprene rubber +++
Chlorosulfonated polyethylene +++
Polysulphide rubber +++
EVA rubber (Ethyl Vinyl Acetate) +++
Ethyl acrylate rubber ++
TPO (Olefinic Thermoplastic Elastomer 'Santoprene'  nbsp;     ++
Polyester TPE (thermoplastic elastomer) +++
Styrenic TPE (thermoplastic elastomer) +++
Urethane TPE (thermoplastic elastomer) +++
Butyl rubber -/+ 20-50
Chloro butyl rubber -Bromo -
butyl rubber ++
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Thermoplastics
Type Stability Dose
Polysulfone ++++ >1000
PES (polyestersulfone) +++
PS (polystyrene) ++++ >1000
SAN (styrene acrylonitrile +++ 1000
Poly-alpha-methyl styrene +++
ABS (acrylonitrile butadiene styrene) +++ 1000
PS/polybutadiene blend ++++
Alkene fumarate styrene copolymer ++++
Styrene maleic anhydride copolymer ++++
Styrene acrylonitrile copolymer ++++
LDPE (low density polyethylene) +++/++++ 500
LLDPE (linear low density polyethylene) +++ 500
MDPE (medium density polyethylene) +++ 500
HDPE (high density polyethylene) ++++
XLPE (crosslinked polyethylene) ++++
PP (polypropylene, homopolymer) + <50
PP (polypropylene, copolymer) ++ <60
Poly (alkylene sulphide) ++
PA (polyamide) "Nylon 6" +++
PA (polyamide) "Nylon 12" +++
PI (poly imide) ++++ 100000
PAI (polyamide imide) ++++ 100000
PEI (poly ether imide) ++++
PEEK (poly ether ether keton) ++++ 10000
PAEK (Ultrapek) ++++
PVC (poly vinyl chloride) and copolymers ++/+++ 50
PVC polyol (plasticised PVC) +++
PVDC (polyvinylidene chloride) +/++ 50
PVDF (polyvinylidene fluoride) +++ 1000
PVOH (poly vinyl alcohol) ++
Poly vinyl formal +++
Poly vinyl butyral ++++
PVAc (poly vinyl acetate) ++++
Poly vinyl methyl ether +++
Poly (vinyl carbazole) ++++
Perfluoropropylene-vinylidene fluoride copolymer -
PTFE (poly tetra fluor ethylene) Teflon or Fluon - 5
FEP (fluorised ethylene propylene) ++ 50
EFTE (ethylene tetrafluor ethylene copolymer) ++ 1000
PCFTE (poly choro trifluor ethylene) + 200
Poly (chloromethyloxacyclobutane) -
PC (polycarbonate) +/++ 1000
Polyallyl diethylene glycol carbonate ++++
Poly (bis-hydroxy phenyl propane carbonate) +++
PC ABS Alloy ++
PC acrylic alloy ++ 25
Polyphtalate carbonate ++
Polyester carbonate +++ 50-100
Polyester (Mylar or Melinex) +++
Polyester copolymer ++++
Cellulose esters-acetate and nitrate ++
Polydimethyl siloxane ++
Poly (methyl vinyl siloxane) ++
Poly (methyl phenyl siloxane) ++
EVA (ethyl vinyl acetate copolymer) ++ 30
EVOH (ethyl vinyl alcohol) +++
PMMA (polymethylmethacrylate) -/+ 100
PMMA-PS copolymer +++
AMMA acrylonitrile methylmethacrylate copolymer ++
Cyano acrylate -
Polyethyl acrylate ++++
Acrylonitrile copolymer ++
Acrylonitrile ethyl acrylate copolymer ++
Acrylonitrile butyl acrylate copolymer ++
Poly (dihydroperfluorobutyl acrylate) ++
RTPU (rigid thermoplastic polyurethane) ++++
PETP (polyethylterepftalate) +++
PETG (polyethylene terelphtate glycol) ++++ 1000
PBT (polybutyleen terephtalate) +++ 1000
PPO (poly phenyl oxide) +++
Polyphenyl sulphide ++++
POM (polyacetal) (Delrin) - 15
Polyacetal-polyformaldehyde and copolymers -
Polyformaldehyde +
LCP (liquid crystal polymer) ++++
Poly (4-methylpentene) +
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Thermosets
Type Stability Dose
Epoxy resins ++++
Phenol formaldehyde (Bakelite) +++ >1000
Phenol formaldehyde resin filled with asbestos, ++++
graphite or mineral flour -
Urea formaldehyde UF resins ++/+++ >1000
Aniline formaldehyde resin ++++
Phenolic aniline resin ++++
Melamine formaldehyde ++/+++ >1000
Casein formaldehyde resin ++++
Furan resin ++++
Silicone resin with glass fibre -
Polyphenylene sulphide resin ++++
Polyimide ++++ 100000
PUR poly urethane ++++
Polyether urethane ++++
Polyester resin filled ++++
Polyester styreen modified +++
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Textiles
Type Stability Dose
Polyester-Terylene or Dracon ++
Cellulose acetate "Dricel" and "Tricel" ++
Cellulose propionate ++
Cellulose nitrate ++
Cellulose acetobutyrate +++ 100
Ethyl cellulose ++
Cellulose (viscose rayon) ++
Acrylic yarn-Orlon, Acrilan and Courtelle ++
Wool ++
Silk +
Nylon 6 and 6:6 ++
Cotton +
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Adhesives
Type Stability Dose
Araldite (epoxy based) +++
Vinyl type e.g.: polyvinylacetate ++
Pressure sensitive adhesive +
PUR-adhesive +++
EVA-copolymer ++
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Oils and greases
Type Stability Dose
Mineral oils and diesters +++
Silicone oils ++
Natural oils +
Commercial Greases ++
Metals ++++
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