[RTP Company]

Product Data Sheet &
General Processing Conditions

VLF 81007
Polybutylene Terephthalate (PBT)
Long Glass Fiber


English SI Metric ASTM
Primary Additive40 % 40 %  
Specific Gravity1.63 1.63  D 792
Molding Shrinkage 
    1/8 in (3.2 mm) section0.0010 - 0.0030 in/in 0.10 - 0.30 %  D 955

Impact Strength, Izod 
    notched 1/8 in (3.2 mm) section4.5 ft-lbs/in 240 J/m  D 256
    unnotched 1/8 in (3.2 mm) section19.0 ft-lbs/in 1014 J/m  D 4812
Tensile Strength24500 psi 169 MPa  D 638
Tensile Elongation2.0 - 3.0 % 2.0 - 3.0 %  D 638
Tensile Modulus1.90 x 10^6 psi 13100 MPa  D 638
Flexural Strength36500 psi 252 MPa  D 790
Flexural Modulus1.80 x 10^6 psi 12411 MPa  D 790

Deflection Temperature 
    @ 264 psi (1820 kPa)400 °F 204 °C  D 648
Ignition Resistance* 
    Flammability**HB @ 1/16 in  HB @ 1.5 mm  D 635
Data herein is typical and not to be construed as specifications.
Unless otherwise specified, all data listed is for natural or black colored materials. Pigments can affect properties.
* This rating is not intended to reflect hazards of this or any other material under actual fire conditions.
** Values per RTP Company testing.

 English SI Metric  
Injection Pressure10000 - 18000 psi 69 - 124 MPa  
Melt Temperature460 - 520 °F 238 - 271 °C  
Mold Temperature150 - 250 °F 66 - 121 °C  
Drying4 hrs @ 250 °F 4 hrs @ 121 °C  
Moisture Content0.02 % 0.02 %  
Dew Point-20 °F -29 °C  

Use a reverse barrel profile. To maximize fiber length, the following injection barrel, screw, and tip designs should be followed. L/D ratio 16/1 - 22/1, Compression ratio 2:1, Flight depth 0.200 in (5 mm) minimum, in feed section, Screw diameter 0.65 - 0.80 in (16.5 - 20 mm) minimum, Compression section length 12 - 13 diameters, Check ring valve assembly - free flow type no restrictions, Nozzle orifice 0.250 in (6 mm) diameter. Feed throat from hopper to machine must have sufficient opening to prevent bridging of long pellet composition.
Desiccant Type Dryer Required.

28 Mar 2005 KMH

This information is intended to be used only as a guideline for designers and processors of modified thermoplastics. Because design and processing is complex, a set solution will not solve all problems. Observation on a “trial and error” basis may be required to achieve desired results.

Data are obtained from specimens molded under carefully controlled conditions from representative samples of the compound described herein. Properties may be materially affected by molding techniques applied and by the size and shape of the item molded. No assurance can be implied that all molded articles will have the same properties as those listed.

No information supplied by RTP Company constitutes a warranty regarding product performance or use. Any information regarding performance or use is only offered as suggestion for investigation for use, based upon RTP Company or other customer experience. RTP Company makes no warranties, expressed or implied, concerning the suitability or fitness of any of its products for any particular purpose. It is the responsibility of the customer to determine that the product is safe, lawful and technically suitable for the intended use. The disclosure of information herein is not a license to operate under, or a recommendation to infringe any patents.

RTP COMPANY • 580 EAST FRONT STREET • WINONA, MN 55987 • 507-454-6900