PVDF (Polyvinylidene fluoride)
Product Description
Our Advanced Biodiesel Venturi Injector is ideal for suction mixing of methoxide with veg oil feed. Advanced Biodiesel's PVDF venturi is impervious to biodiesel degradation. The twisting vanes give a rotary component of motion to an outer portion of the stream in the injection portion, and the straightening vanes remove at least some of it in the expanding portion, both to cause more pronounced vigorous mixing, and improved the solution of methoxide and oil feedstock. Twisting vanes are formed in the constricting portion, and straightening is formed in the expanding portion.
1) Special low flow rate design for optimum 15 to 1 mixing of feedstock and methoxide.
2) Low power consumption, long service life, easy installation and maintenance, and reliable performance
3) PVDF (Polyvinylidene fluoride) Material, resists the Biodiesel degradation.
4) Intersection check valve: nickel alloy-C spring, fluorine rubber sealing mat, TEFLON ball, KEI-F base, insures no backflow into the methoxide carboy.
Technical parameter:
Model: A25152
Length: 152 mm
flow amount: 1~3T(M3)/HR
Gas inlet connector dimension: 0.25"
inlet & outlet connector dimension: 0.75"
Material: PVDF
Unfortunately Mazzei venturies are made out of ABS plastic which melts in biodiesel, which is why we recommend the 25152 made out of PVDF and is impervious to biodiesel.
PVDF Detailed Properties
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The table below lists a generally accepted summary of properties that we believe to be reliable. Please note that many of these resins are produced in several varieties and property characteristics may vary. Therefore, determination of resin is dependent on the application and this table is only meant to serve as a general guideline. |
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Properties |
ASTM or Unit |
PVDF |
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MECHANICAL PROPERTIES |
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Specific Gravity |
D792 |
1.77 |
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Elongation% |
D638 |
300~450 |
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Tensile Strength (psi) |
D638 |
4500-6200 |
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Flexural Strength (psi) |
D790 |
8600-9500 |
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Compressive Strength |
D695 |
11,600 |
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Tensile Elastic Modulus |
D638 |
160,000 |
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Flexural Modulus |
D790 |
90,000~168,000 |
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Flex Life |
D2176 |
n.a |
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D636 |
D75~85 |
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Coefficient of Friction |
D1984 |
0.4 |
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Abrasion Resistance |
Taber |
5~15 |
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Impact Strength IZOD |
D256 |
4 |
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THERMAL PROPERTIES |
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Melting Point |
°C |
171 |
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Upper Service |
°C |
129 |
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Flame Rating** |
UL 94 |
V-0 |
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Thermal Conductivity |
BTU/hr/ft2/deg F in |
1.3 |
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cal/sec/cm2,ºC/cm |
3.0x10-4 |
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Linear Coefficient of Thermal Expansion |
D696 |
4.2 |
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Heat of Fusion |
BTU/LB |
n.a |
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Heat of Combustion |
BTU/LB |
n.a |
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Low Temperature Embrittlement |
°C |
-62 |
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ELECTRICAL PROPERTIES |
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Dielectric Constant |
D150/103Hz |
7.72 |
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D150/106Hz |
6.43 |
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Dielectric Strength |
D149 |
>1080 |
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Volume Resistivity |
D257 |
2 x 1014 |
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Surface Resistivity |
D257 |
5 x 1014 |
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GENERAL PROPERTIES |
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Chemical/Solvent |
D543 |
Very Good |
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Water Absorption, 24h,% |
D570 |
<0.04 |
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Refractive Index |
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1.42 |
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Limiting Oxygen Index % |
D2863 |
43 |
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Properties |
ASTM or Unit |
PVDF |
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Weight Gain (+/-0.1%) |
Dimension Change (+/-0.1%) |
Tensile Strength Change |
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Pure Diesel |
0.1% |
0.0% |
+7% |
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Blend (80% diesel + 20% biodiesel) |
0.0% |
0.0% |
+7% |
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Pure Biodiesel |
0.0% |
0.0% |
+7% |
Common plastic materials, such as polyethylene, will swell in the presence of gasoline and diesel. Long-term exposure then results in a loss of the mechanical resistance of these plastics.
Fluoropolymer resins do not absorb diesel and they retain their strength and physical properties in the presence of fuels. Moreover, because PVDF can crystallize with time, PVDF became stronger during the testing. The tensile strength increased by more than 7% over 8 weeks in this experiment.
