| ACETAL (Click for Properties & Specs) Back to the Materials Group main page. Acetal, within the boundaries of thermoplastic chemistry, is a virtually faultless material. As an engineering thermoplastic, it is dependable across the properties spectrum. It exhibits few performance compromises. Parts machined from Acetal offer a combination of properties not available with metals and other materials of construction. Resulting benefits can include lower part costs, longer service life, improved performance and greater design latitudes. Acetal is manufacturered from two types of resin. Delrin, which is an acetal homopolymer, and BASF Ultraform, which is an acetal copolymer formed by polymerization of two monomers. Properties of these two products vary because of their chemical make-up. Acetal shapes are produced using state-of-the-art equipment and premium resins. Material properties are strictly maintained through carefully controlled processing and meticulously observed quality control standards. Users of Acetals are always assured of excellent materials that perform to design expectations. General Purpose Acetal A natural Acetal material, has a high degree of crystallinity. It is a tough, stable thermoplastic offering a unique combination of properties. Key property advantages of general purpose acetal include a high modulus of elasticity, high strength, rigidity, and dimensional stability. The material also exhibits a high natural lubricity, a wide useful temperature range and good electricals. It also exhibits excellent resistance to moisture, gasolines, solvents and many other neutral chemicals. Other characteristics include low coefficient of friction, good bearing properties and a high resistance to repeated impacts and makes it ideal for close tolerance parts and electrical insulators requiring high structural strength at above normal temperatures, or in high moisture environments. As an engineering plastic, acetal has many applications where it out-performs metals. Uses: bearings gears
electrical components fuel system parts pulleys
anti-friction parts and many more!
Key Properties high mechanical strength
high modulus of elasticity high natural lubricity
excellent dimensional stability low moisture absorption
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Glass Filled Acetal (High Strength) Glass-fiber filled Acetal combines high strength with basic acetal properties. Overall mechanical properties and dimensional stability are enhanced in this tough material. Specific property advantages include increased stiffness, better creep resistance and a higher dimensional stability. Parts designed using glass-filled acetal will exhibit high fatigue endurance, low deformation under load and good impact resistance. Uses: gears bearings bushings
requiring high load strength close tolerance, precision parts parts requiring greater stiffness
and many more...
Properties: high tensile strength improved creep resistance
greater stiffness greater dimensional stability light weight
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| NOTE: All values are average test results from typical production material. No warranty is implied or guaranteed and testing is recommended for each application. |
ASTM Property Tested Test Units Acetal Acetal Glass filled Delrin
Test (Homopolymer) (Copolymer) Acetal
Method
PHYSICAL
D638 Tensile Strength p.s.i. 10,000 9,000 12,000 7,600
D638 Elongation (Break) %@73°F. 75 60 -- 22
D1822 Tensile Impact ft.lbs./sq.in. 170 90 -- 50
D695 Compressive Strength p.s.i. (at yield) 18,000 16,000 16,500 13,000
D790 Flexural Strength p.s.i. 14,300 13,000 20,000 10,500
D256 Impact Strength ft.lbs./in@73°F 2.3 1.5 .8-1.0 1.2
(Notched IZOD)
D785 Hardness Rockwell R-M R120 M80 M79 R118
D621 Deformation Under %(122°F, 2000 0.5 -- 0.5 0.6
Load p.s.i. 24 hrs.)
THERMAL
D696 Thermal Conductivity B.T.U./hr./sq.ft./of 2.6 -- -- --
D648 Thermal Expansion in. 5.8 x 10 4.7 x 10 -- 5.8 x 10
D789 Heat Deflection in./in.°F 342 320 326 334
Melting Point °F@ 66 p.s.i. 277 230 292 244
°F@ 264 p.s.i. 347 329 331 347
ELECTRICAL
D149 Dielectric Strength Volts/mil 500 500 -- 400
D257 Volume Resistivity OHMS/cm. 10 -- 1.2x10 3x10
D150 Dielectric Constant
100 HZ 3.7 3.8 3.8 3.1
10 HZ 3.7 3.8 3.8 3.1
D150 Dissipation (Power Factor)
100 HZ -- 0.0010 0.0021 --
10 HZ -- 0.0010 0.0020 --
10 HZ Seconds 0.005 0.0005 0.0061 0.009
Arc Resistance 220 -- 200 183
Chemical
D543 Chemical Resistance
@ 73°F Weak Acids Resistant Resistant Resistant Resistant
to Some to Some to Some to Some
Strong Acids Attacked Attacked Attacked Attacked
Weak Alkalies Resistant Resistant Resistant Resistant
to Some to Some to Some to Some
Strong Alkalies Attacked Attacked Attacked Attacked
Miscellaneous
D792 Specific Gravity Grams/C.C. 1.42 1.41 1.58 1.54
D570 Water Absorption %(24 hrs.) 0.25 0.22 0.25 0.20
D635 Burning Rate Slow Slow Slow Slow
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