Product Information
Dec 2018
Ultradur® B 2550 FC
Polybutylene Terephthalate (PBT)

Product Description
Ultradur B 2550 FC is an unfilled, easy flow PBT offering good heat resistance. This grade is a food contact grade.

Applications include monofilament, bristles and heat-resistant coatings on paper and board used for packaging frozen foods and oven-ready meals. Also for injection molding applications that call for high flowability.

PHYSICAL ISO Test Method Property Value
Density, g/cm³ 1183 1.30
Viscosity Number, cm³/g 1628 107
RHEOLOGICAL ISO Test Method Property Value
Melt Volume Rate (250 C/2.16 Kg), cc/10min. 1133 40
MECHANICAL ISO Test Method Property Value
Tensile Modulus, MPa 527  
    23C 2,500
Tensile stress at yield, MPa 527  
    23C 57
Tensile strain at yield, % 527  
    23C 3.7
Nominal strain at break, % 527  
    23C 35
Ball Indentation, MPa 2039-1 130
Tensile Creep Modulus (1000h), MPa 899 1,100
IMPACT ISO Test Method Property Value
Charpy Notched, kJ/m2 179  
    23C 6
Charpy Unnotched, kJ/m2 179  
    23C 250
THERMAL ISO Test Method Property Value
Melting Point, C 3146 223
HDT A, C 75 65
HDT B, C 75 165
ELECTRICAL ISO Test Method Property Value
Comparative Tracking Index IEC 60112 500
Volume Resistivity (Ohm-m) IEC 60093 1E14
Surface Resistivity (Ohm) IEC 60093 1E13
Dielectric Constant (100 Hz) IEC 60250 3.3
Dielectric Constant (1 MHz) IEC 60250 3.3
Dissipation Factor (100 Hz), E-4 IEC 60250 13
Dissipation Factor (1 MHz), E-4 IEC 60250 200
UL RATINGS UL Test Method Property Value
Flammability Rating, 1.5mm UL94 HB

Processing Guidelines
Material Handling
Max. Water content: 0.04%
To ensure optimum part performance, this product must be dried prior to molding and maintained at a moisture level of less than 0.04%. Dehumidifying or desiccant dryers operating at 100-120C (212-248F) at 4 hours drying time is recommended. Further information concerning safe handling procedures can be obtained from the Safety Data Sheet. Alternatively, please contact your BASF representative.

Typical Profile
Melt Temperature 260-270C (500-518F)

Typical Temperature Profile:
Zone 1: 260-265C (500-509F)
Zone 2: 265-275C (509-527F)
Zone 3: 260-270C (500-518F)
Zone 4: 255-265C (491-509F)
Head: 260-270C (500-518F)
Pump: 260-270C (500-518F)
Die Zones: 260-270C (500-518F)

Recommended Screw:
Three section screw: 6D/7D/9D + 3D
Compression Ratio: 3.5:1 to 4:1
L/D Ratio: 25:1 minimum

Water Bath Temperature: 45-60C (113-140F)

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: