Volume 4 - Loctite.ph

Cellulose Acetate Propionate (CAP)ThermoplasticTrade Names• TeniteManufacturerEastman Chemical ProductsGeneral DescriptionCellulose is a naturally occurring polymer derived from wood pulp andcotton which is chemically modified to form a cellulosic plastic. The threemajor families of cellulose are ethyl cellulose, cellulose nitrate, andcellulose esters. The four most commonly used cellulose esters arecellulose acetate (CA), cellulose acetate butyrate (CAB), cellulose acetatepropionate (CAP), and cellulose triacetate. Cellulose acetate propionate,one of the most commonly used cellulosic polymers, is manufactured byreacting cellulose with propionic acid and propionic anhydride. Cellulosicsare tough, abrasion resistant plastics that have found use in a variety ofapplications such as films, dice, and eyeglasses. Specialty gradesavailable include plasticized, UV stabilized, flame retardant, and colored.In 2004, the price of CAP ranged approximately from $1.75 to $2.00 perpound at truckload quantities.Typical Properties of Cellulose Acetate Propionate (CAP)American EngineeringProcessing Temperature 446°F to 464°F 230°C to 240°CLinear Mold Shrinkage 0.002 to 0.006 in./in. 0.002 to 0.006 cm/cmMelting Point 300°F to 400°F 149°C to 204°CDensity 74.9 to 81.2 lb./ft. 3 1.20 to 1.30 g/cm 3Tensile Strength, Yield 3.6 to 6.1 lb./in. 2 x 10 3 2.5 to 4.3 kg/cm 2 x 10 2Tensile Strength, Break 4.5 to 7.1 lb./in. 2 x 10 3 3.2 to 5.0 kg/cm 2 x 10 2Elongation, Break 34.0 to 50.0% 34.0 to 50.0%Tensile Modulus – –Flexural Strength, Yield 4.4 to 8.2 lb./in. 2 x 10 3 3.1 to 5.8 kg/cm 2 x 10 2Flexural Modulus 1.9 to 3.2 lb./in. 2 x 10 5 1.3 to 2.2 kg/cm 2 x 10 4SIGeneral PropertiesThe main benefits offered by cellulosics are clarity, toughness at lowtemperatures, abrasion resistance, glossy appearance, resistance tostress cracking, and good electrical insulating properties. Other benefitsof cellulosics include a warm, pleasant feel to the touch (due to their lowthermal conductivity and specific heat), the availability of formulationswhich can be used in contact with food, and the ability to be processedby most thermoplastic methods. Generally, plasticizers are added tolower the melt temperature and modify the physical properties. Asplasticizer is added, the hardness, stiffness and tensile strengthdecrease, while the impact strength increases. The solvent resistance ofcellulosics varies with type. In general, they are resistant to attack byaliphatic hydrocarbons, bleach, ethylene glycol, salt solutions, andvegetable and mineral oils. However, cellulosics are known to beattacked by alkaline materials and fungus. Cellulosics are further limitedby their flammability, low continuous use temperatures, and poorresistance to weathering, although UV resistant grades are available.Compressive Strength 4.4 to 8.1 lb./in. 2 x 10 3 3.1 to 5.8 kg/cm 2 x 10 2Izod Notched, R.T. 1.2 to 8.3 ft.-lb./in. 6.5 to 44.8 kg cm/cmHardness R75 - R130 Rockwell R75 - R130 RockwellThermal Conductivity 1.73 to 1.74 BTU-in./hr.-ft. 2 -°F 0.246 to 0.251 W/m-°KLinear ThermalExpansionDeflection Temperature@ 264 psiDeflection Temperature@ 66 psiContinuousService Temperature– –120°F to 200°F 49°C to 93°C140°F to 230°F 60°C to 110°C– –Dielectric Strength – –Dielectric Constant@ 1 MHzDissipation Factor@ 1 MHzWater Absorption,24 hr.3.5 to 3.6 3.5 to 3.60.020 to 0.030 0.020 to 0.0301.3 to 2.4% 1.3 to 2.4%Typical Applications• Films – Photographic film, audio tape, visual aids,greeting cards, photo albums• Miscellaneous – Lacquer and cement base, explosives, fashionaccessories, flashlight cases, fire extinguisher components, toys,tool handles, electrical appliance housings, eyeglass framesand lenses, lighting fixtures, brush handles24The Loctite ® Design Guide for Bonding Plastics, Volume 4