eFunda Polymers: Properties of Acetal {homopolymer, impact modified}
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Acetal		  
List of Suppliers
State: homopolymer
Additives: impact modified
Material Properties
 Mechanical Properties Conditions
State 1 State 2 ASTM
Elastic Modulus (MPa)   1311 - 2415  tensile   D638
Flexural Modulus (MPa)   1035 - 2415   23 ºC   D790
  345 - 690   94 ºC   D790
  228 - 414  122 ºC   D790
Tensile Strength (MPa)   45 - 58 at break   D638
  38 - 55 at yield   D638
Compressive Strength (MPa)
at yield or break		   53 - 83  at 10% strain   D695
Flexural Strength (MPa)
at yield or break		   41 - 69     D790
Elongation at break (%)   60 - 200     D638
Hardness   58 - 79  Rockwell M   D638
Izod Impact (J/cm of notch)
1/8" thick specimen unless noted		   1.1 - 9.0     D256A

 Thermal Properties Conditions
Pressure State ASTM
Coef of Thermal Expansion (10-6/ºC)   92 - 117     D696
Deflection Temperature (ºC)  145 - 169   0.46 MPa   D648
  65 - 85   1.82 MPa   D648

 Physical & Electrical Properties Conditions
State ASTM
Specific Gravity  1.32 - 1.39   D792
Water Absorption (% weight increase)  0.3 - 0.44  after 24 hrs D570
 0.75 - 0.85  saturated D570
Dielectric Strength (V/mil);
1/8" thick specimen unless noted		   400 - 480  90 mil thick D149

 Processing Properties Conditions
Type ASTM
Melt Flow (gm/10 min)  0.5 - 7   D1238
Melting Temperature (ºC)  175  Tm, crystalline  
Processing Temperature (ºC)  194 - 216  injection molding  
Molding Pressure (MPa)   42 - 83    
Linear Mold Shrinkage (cm/cm)  0.012 - 0.019   D955

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Suppliers
Ashley Polymers Brooklyn, NY   
DuPont Co., Polymers Wilmington, DE  800-438-7225

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