Product Information
Jun 2020
Ultraform® H 4320 UNC Q600
Polyoxymethylene (POM)

Product Description
Ultraform H 4320 UNC Q600 is an extrusion POM high molecular weight grade. This grade enables high extrusion rates with thick-walled product. It also exhibits high thermal stability and a low tendency to discolor.

Typical applications include pipe and semi-finished parts for gear wheels, bearings and other mechanical elements.

PHYSICAL ISO Test Method Property Value
Density, g/cm³ 1183 1.39
Mold Shrinkage, parallel, % 294-4 2.2
Mold Shrinkage, normal, % 294-4 2.1
Moisture, % 62  
    (50% RH) 0.2
    (Saturation) 0.8
RHEOLOGICAL ISO Test Method Property Value
Melt Volume Rate (190 C/2.16 Kg), cc/10min. 1133 2.2
MECHANICAL ISO Test Method Property Value
Tensile Modulus, MPa 527  
    23C 2,600
Tensile stress at yield, MPa 527  
    -40C 93
    23C 63
    80C 32
Tensile strain at yield, % 527  
    23C 10
Nominal strain at break, % 527  
    23C 31
Flexural Modulus, MPa 178  
    23C 2,700
Tensile Creep Modulus (1000h), MPa 899 1,300
IMPACT ISO Test Method Property Value
Izod Notched Impact, kJ/m2 180  
    -40C 4
    23C 5
Charpy Notched, kJ/m2 179  
    -30C 5.5
    23C 6
Charpy Unnotched, kJ/m2 179  
   -30C 180
    23C 250
THERMAL ISO Test Method Property Value
Melting Point, C 3146 166
HDT A, C 75 95
HDT B, C 75 156
Coef. of Linear Thermal Expansion, Parallel, mm/mm C 1.1 X10-4
ELECTRICAL ISO Test Method Property Value
Comparative Tracking Index IEC 60112 600
Volume Resistivity (Ohm-m) IEC 60093 1E13
Surface Resistivity (Ohm) IEC 60093 1E13
Dielectric Constant (100 Hz) IEC 60250 3.8
Dielectric Constant (1 MHz) IEC 60250 3.8
Dissipation Factor (100 Hz), E-4 IEC 60250 10
Dissipation Factor (1 MHz), E-4 IEC 60250 50
Dielectric Strength, KV/mm IEC 60243-1 40

Processing Guidelines
Material Handling
Max. Water content: 0.15%
Product is supplied in polyethylene bags and drying prior to molding is not required. However, after relatively long storage or when handling material from previously opened containers, preliminary drying is recommended in order to remove any moisture which has been absorbed. If drying is required, a dehumidifying or desiccant dryer operating at 80 - 110C (176 - 230F) is recommended. Drying time is dependent on moisture level, however 2-4 hours is generally sufficient. Further information concerning safe handling procedures can be obtained from the Safety Data Sheet. Alternatively, please contact your BASF representative.

Typical Profile
Melt Temperature 175-200C (347-392F)

Typical Barrel Profile (C):

Rear 170C (338F)
Middle 180C (356F)
Front 200C (392F)

Adaptor 175C (347F)
Die 175C (347F)

Screw Parameters
Metering Section 40% 
Transition Section 3 to 5 flights 
Feed Section balance of screw length 
Compression Ratio 3:1 
L/D Ratio 20:1 to 25:1 

Tooling & Sizing
Die to Finished Tube dia. 2.0-4.0:1

Selection of pin and die size will be dependent on the material viscosity. In general, the ratio of die size to finished tube diameter is about 2.0-4.0:1. The mandrel (pin) size is determined the same way in relation to the inner tube diameter.

Although all statements and information in this publication are believed to be accurate and reliable, they are presented gratis and for guidance only, and risks and liability for results obtained by use of the products or application of the suggestions described are assumed by the user. NO WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE MADE REGARDING PRODUCTS DESCRIBED OR DESIGNS, DATA OR INFORMATION SET FORTH. Statements or suggestions concerning possible use of the products are made without representation or warranty that any such use is free of patent infringement and are not recommendations to infringe any patent. The user should not assume that toxicity data and safety measures are indicated or that other measures may not be required.

  BASF Corporation
Engineering Plastics
1609 Biddle Avenue
Wyandotte, MI 48192
General Information: 800-BC-RESIN
Technical Assistance: 800-527-TECH (734-324-5150)
Web address: