Acetal

Acetal homopoly­mer, poly­oxymeth­yl­ene, or POM [Cel­con®, Del­rin®, Uni­tal® H]

Prop­er­ties

  • Crys­talline plas­tic with prop­er­ties some­where between a metal and a plastic
  • Sheets and rods have high ten­sile strength, creep resis­tance and fatigue endurance
  • Harder and stiffer than acetal copolymers
  • Low mois­ture absorption
  • Resis­tant to hydro­car­bons, sol­vents and neu­tral chemicals
  • Avail­able in nat­ural and black grades (nat­ural is FDA-, NSF– and USDA-compliant)

Com­mon uses

  • Indus­trial applications
  • Gears
  • Con­vey­ors
  • Doors
  • Fuel sys­tems

Acetal copoly­mer [Tecaform®, Tecaform® HPV 13, Del­rin® AF blend alter­na­tive, Uni­tal® LF-13]

Prop­er­ties

  • Strong semi-crystalline ther­mo­plas­tic with stiff­ness, tough­ness and good wear resistance.
  • Resis­tant to hot water, hydro­car­bons and solvents
  • Avail­able in nat­ural and black grades (nat­ural is FDA-, NSF– and USDA– and 3A-compliant; black is FDA-compliant). Med­ical grades avail­able in colors.

Com­mon uses

  • Bush­ings
  • Rollers
  • Wear strips
Natural and black acetal

Nat­ural and black acetal

Acetal Rod

Acetal Rod

Typ­i­cal prop­er­ties of acetals (homopoly­mer and copolymer)

ASTM or UL test Prop­erty Homopoly­mer Copoly­mer Uni­tal LF-13
Phys­i­cal
D792 Spe­cific grav­ity (g/cm3) 1.42 1.41 1.48
D570 Water absorp­tion, 24 hrs (%) 0.25 0.20 0.23
Mechan­i­cal
D638 Ten­sile strength @yield (psi) 9,000 8,800 8,000–8,500
D638 Ten­sile mod­u­lus (psi) 350,000 380,000 600,000
D638 Ten­sile elon­ga­tion @break 25 25 15–30
D790 Flex­ural strength @yield (psi) 11,500 11,000 13,500
D790 Flex­ural mod­u­lus (psi) 420,000 360,000 410,000
D785 Hard­ness, Rockwell M94 M86 M89
D256 Izod impact strength, notched (ft•lbs/in) 1.5 1.0 0.8
Ther­mal
D696 Coef­fi­cient of lin­ear ther­mal expan­sion (x 10–5 in/in/°F/°C) 6.8 x 10–5 4.7 x 10–5 5.2 x 10–5
D648 Heat deflec­tion temp (F°) @ 264 psi 336 316 235
D3418 Melt­ing temp (F) 347 329 347
- Max oper­at­ing temp (°F) - - 185
C177 Ther­mal con­duc­tiv­ity (BTU-in/ft2–h-°F) - - -
UL94 Flam­ma­bil­ity rating H-B H-B H-B
Elec­tri­cal
D149 Dielec­tric strength (V/mil) - 500 400
D150 Dielec­tric con­stant @ 1 KHz - 3.7 3.1
D150 Dis­si­pa­tion fac­tor @ 60 Hz - 0.001 0.009
D257 Vol­ume resis­tiv­ity (ohm/cm)@50% RH - 1.0 x 1014 1015

These are typ­i­cal val­ues for ref­er­ence and com­par­i­son only. They should not be used as a basis for design spec­i­fi­ca­tions or qual­ity con­trol. Con­tact us for the man­u­fac­tur­ers’ com­plete mate­r­ial prop­erty datasheets. All val­ues were taken at 73°F (23°C) unless oth­er­wise noted.

Don’t see what you’re look­ing for? Call us at 800–423-2769 or email us at tom@crownplasticsinc.com.

*Tecaform® is a reg­is­tered trade­mark of Ensinger.