eFunda Polymers: Properties of Acetal {copolymer, 2 - 20% PTFE filled}
engineering fundamentals Polymer Material Properties
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Acetal
 
List of Suppliers
State: copolymer
Additives: 2 - 20% PTFE filled
Material Properties
 Mechanical Properties Conditions
State 1 State 2 ASTM
Elastic Modulus (MPa)   1725 - 1932  tensile   D638
Flexural Modulus (MPa)   2139 - 2484   23 ºC   D790
Tensile Strength (MPa)   57 at break   D638
  57 at yield   D638
Compressive Strength (MPa)
at yield or break
  76 - 87     D695
Flexural Strength (MPa)
at yield or break
  79     D790
Elongation at break (%)   30     D638
Hardness   79  Rockwell M   D638
Izod Impact (J/cm of notch)
1/8" thick specimen unless noted
  0.3 - 0.5     D256A

 Thermal Properties Conditions
Pressure State ASTM
Coef of Thermal Expansion (10-6/ºC)   52 - 68     D696
Deflection Temperature (ºC)  138 - 163   0.46 MPa   D648
  92 - 107   1.82 MPa   D648
Thermal Conductivity (W/m-ºC)  0.196     C177

 Physical & Electrical Properties Conditions
State ASTM
Specific Gravity  1.4   D792
Water Absorption (% weight increase)  0.15 - 0.26  after 24 hrs D570
 0.5  saturated D570
Dielectric Strength (V/mil);
1/8" thick specimen unless noted
  400 - 410   D149

 Processing Properties Conditions
Type ASTM
Melting Temperature (ºC)  160 - 175  Tm, crystalline  
Processing Temperature (ºC)  163 - 260  injection molding  
 177 - 229  injection molding  
 182 - 260  extrusion  
Molding Pressure (MPa)   55 - 138    
Compression Ratio  3 - 4.5    
Linear Mold Shrinkage (cm/cm)  0.018 - 0.029   D955

Suppliers
ComAlloy International Co. Nashville, TN   
DSM Engineering Plastic Products, Inc. Reading, PA  800-729-0101
Ferro Corp. Cleveland, OH   
LG Chemical America, Inc. Englewood Cliffs, NJ   
LNP Engineering Plastics, Inc. Exton, PA  800-854-8774
M.A. Hanna Engineered Materials Norcross, GA   
RTP Co. Winona, MN  800-433-4787
Ticona Summit, NJ  800-526-4960
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