eFunda Polymers: Properties of Acetal {copolymer}
engineering fundamentals Polymer Material Properties
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Acetal
 
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State: copolymer
Material Properties
 Mechanical Properties Conditions
State 1 State 2 ASTM
Elastic Modulus (MPa)   3105  compressive   D638
  2601 - 3202  tensile   D638
Flexural Modulus (MPa)   2553 - 3105   23 ºC   D790
Tensile Strength (MPa)   57 - 72 at yield   D638
Compressive Strength (MPa)
at yield or break
 110  at 10% strain   D695
Flexural Strength (MPa)
at yield or break
  90     D790
Elongation at break (%)   15 - 75     D638
Hardness   75 - 90  Rockwell M   D638
Izod Impact (J/cm of notch)
1/8" thick specimen unless noted
  0.4 - 0.8     D256A

 Thermal Properties Conditions
Pressure State ASTM
Coef of Thermal Expansion (10-6/ºC)   61 - 110     D696
Deflection Temperature (ºC)  155 - 166   0.46 MPa   D648
  85 - 121   1.82 MPa   D648
Thermal Conductivity (W/m-ºC)  0.230     C177

 Physical & Electrical Properties Conditions
State ASTM
Specific Gravity  1.4   D792
Water Absorption (% weight increase)  0.2 - 0.22  after 24 hrs D570
 0.65 - 0.8  saturated D570
Dielectric Strength (V/mil);
1/8" thick specimen unless noted
  500  90 mil thick D149

 Processing Properties Conditions
Type ASTM
Melt Flow (gm/10 min)  1 - 90   D1238
Melting Temperature (ºC)  160 - 175  Tm, crystalline  
Processing Temperature (ºC)  171 - 204  compression molding  
 182 - 232  injection molding  
Molding Pressure (MPa)   55 - 138    
Compression Ratio  3 - 4.5    
Linear Mold Shrinkage (cm/cm)  0.02  average value D955

Suppliers
American Polymers, Inc. Worcester, MA   
Ashley Polymers Brooklyn, NY   
BASF Corp. Mount Olive, NJ  800-BC-RESIN
LG Chemical America, Inc. Englewood Cliffs, NJ   
M.A. Hanna Engineered Materials Norcross, GA   
Network Polymers, Inc. Akron, OH  888-437-4674
RTP Co. Winona, MN  800-433-4787
Ticona Summit, NJ  800-526-4960
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