Volume 4 - Loctite.ph

Styrene-Acrylonitrile (SAN)ThermoplasticTrade Names Manufacturer• LuranBASF• LustranBayer Corporation• StyvexFerro Corporation• SuprelVista Chemical Company• TyrilDow ChemicalTypical Properties of Styrene-Acrylonitrile (SAN)American EngineeringSIProcessing Temperature 415°F to 515°F 213°C to 268°CLinear Mold Shrinkage 0.001 to 0.005 in./in. 0.001 to 0.005 cm/cmMelting Point 212°F to 480°F 100°C to 249°CGeneral DescriptionSAN is a high performance polymer of the styrene family, which isformed via the copolymerization of styrene and acrylonitrile monomers.The general properties of SAN are similar to polystyrene, but the additionof the polar acrylonitrile group adds superior chemical resistance, hightemperature performance, and toughness. Typical of copolymers, theproperties of SAN can be varied by changing the molecular weight andcomposition. An increase in the acrylonitrile content will improve theresin’s physical properties but will make processing more difficult anddecrease its transparency. SAN can be used as a color carrier for otherthermoplastics and as an additive to improve the flow characteristics ofABS, PVC, and some other resins. Specialty grades available includethose with UV stabilizers, elastomers, glass fibers, and flow aids. In2004, the price ranged approximately from $1.09 to $1.45 per poundat truckload quantities.General PropertiesThe major benefits of SAN are its stiffness, strength, and clarity.However, like polystyrene, SAN has a low impact strength, typically0.3 to 1.2 ft.-lb./in. The use of reinforcing fillers, such as glass fiber,can be used to increase its impact strength, as well as the heatresistance, hardness, and modulus of SAN. The continuous servicetemperature of SAN is dependent on the load and specific chemicalenvironment which it will be exposed to, normally varying between120°F (49°C) and 180°F (82°C). SAN plastics are chemically resistantto aliphatic hydrocarbons, battery acids, bases, and most detergents.However, they are attacked by aromatic and chlorinatedhydrocarbons, ketones, and esters.Density 65.6 to 87.4 lb./ft. 3 1.05 to 1.40 g/cm 3Tensile Strength, Yield 9.3 to 17.0 lb./in. 2 x 10 3 6.5 to 12.0 kg/cm 2 x 10 2Tensile Strength, Break 8.3 to 17.6 lb./in. 2 x 10 3 5.8 to 12.4 kg/cm 2 x 10 2Elongation, Break 0.9 to 3.1% 0.9 to 3.1%Tensile Modulus 4.5 to 15.1 lb./in. 2 x 10 5 3.2 to 10.6 kg/cm 2 x 10 4Flexural Strength, Yield 12.9 to 22.8 lb./in. 2 x 10 3 9.1 to 16.0 kg/cm 2 x 10 2Flexural Modulus 4.5 to 15.0 lb./in. 2 x 10 5 3.2 to 10.5 kg/cm 2 x 10 4Compressive Strength 12.5 to 23.2 lb./in. 2 x 10 3 8.8 to 16.3 kg/cm 2 x 10 2Izod Notched, R.T. 0.3 to 1.2 ft.-lb./in. 1.6 to 6.5 kg cm/cmHardness M80 - M98 Rockwell M80 - M98 RockwellThermal Conductivity 1.4 to 2.2 BTU-in./hr.-ft. 2 -°F 0.20 to 0.32 W/m-°KLinear ThermalExpansionDeflection Temperature@ 264 psiDeflection Temperature@ 66 psiContinuousService Temperature1.5 to 3.8 in./in.-°F x 10 -5 2.7 to 6.8 cm/cm-°C x10 -5185°F to 226°F 85°C to 108°C210°F to 235°F 99°C to 113°C120°F to 180°F 49°C to 82°CDielectric Strength 490 to 520 V/10 -3 in. 1.9 to 2.0 V/mm x 10 4Dielectric Constant@ 1 MHzDissipation Factor@ 1 MHzWater Absorption,24 hr.2.7 to 3.7 2.7 to 3.70.008 to 0.010 0.008 to 0.0100.08 to 0.26% 0.08 to 0.26%Typical Applications• Appliances – Knobs, refrigerator compartments,blender and mixer bowls• Electronics – Cassette cases, meter lenses, tape windows• Medical – Syringe components, blood aspirators, dialyzer housings• Packaging – Cosmetic containers, closures, bottles, jars• Miscellaneous – Safety glazing, battery cases,typewriter keys, pen and pencil barrels70The Loctite ® Design Guide for Bonding Plastics, Volume 4