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    • Polytetrafluoroethylene

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    Catalog Number
    ACM9002840-10
    CAS Number
    9002-84-0
    Product Name
    Polytetrafluoroethylene
    Structure
    Category
    Polymers
    Synonyms
    TETRAFLUOROETHYLENE OLIGOMER;TETRAFLUOROETHYLENE RESIN;TEFLON;TEFLON 7A;TEFLON(TM) 30B;TEFLON(TM) 6;TEFLON(TM) 7A;POLYTETRAFLUOROETHYLENE
    Description
    (PTFE), powder, mean particle size 20micron, weight 500 g
    IUPAC Name
    1,1,2,2-tetrafluoroethene
    Molecular Weight
    100.01g/mol
    Molecular Formula
    (CF2CF2)n
    Canonical SMILES
    C(=C(F)F)(F)F
    InChI
    InChI=1S/C2F4/c3-1(4)2(5)6
    InChI Key
    BFKJFAAPBSQJPD-UHFFFAOYSA-N
    Boiling Point
    -105.3 °F at 760 mm Hg (NTP, 1992);-75.9 °C;-19.9 °C;-75.9 °C;-75.9 °C;-105.3°F
    Melting Point
    -224.5 °F (NTP, 1992);-142.5 °C;-89.0 °C;Melts to an extremely viscous gel at 327 °C;-131.15 °C;-131.2 °C;-224.5°F
    Flash Point
    <32 °F (<0 °C) (closed cup) /Tetrafluoroethylene, inhibited/
    Density
    1.519 at -105 °F (NTP, 1992);2.2 g/cu cm;1.519 g/cu cm at -76 °C;Density (at -76 °C): 1.5 g/cm³;1.519 at -105°F
    Solubility
    Insoluble (NTP, 1992);0.00 M;No substance has been found which will dissolve the polymer at moderate temperatures;In water, 1.59X10+2 mg/L at 25 °C;Solubility in water, mg/l at 25 °C: 159 (very slightly soluble)
    Color/Form
    White translucent to opaque solid;Soft, waxy, milk-white solid;White solid;Colorless gas
    Complexity
    55.6
    Covalently-Bonded Unit Count
    1
    EC Number
    204-126-9;618-337-2
    Exact Mass
    99.993613g/mol
    Form
    powder
    Formal Charge
    0
    Heavy Atom Count
    6
    ICSC Number
    1779
    Log P
    log Kow = 1.21 (est);1.21 (estimated)
    MeSH Entry Terms
    tetrafluoroethene;tetrafluoroethylene;tetrafluoroethylene, ion(1+);tetrafluoroethylene, ion(1-)
    Monoisotopic Mass
    99.993613g/mol
    Odor
    Odorless
    Other Experimental
    Not wetted by water; subject to cold flow at high pressure;Useful temp range cryogenic to +260 °C; Reverts to gaseous monomer at temperatures above 400 °C; Shore hardness 55-56; Tensile strength 3500-4500 psi; Flexural modulus about 80,000-90,000 psi at room temperature; Brittle point below -80 °C; Dielectric constant: 2.0-2.05 at 60 to 3X10+9 cycles;Waxy, slippery feel;A highly stable theromplastic tetrafluoroethylene homopolymer. Composed of at least 20,000 CF2 monomer units linked into very long unbranched chains. Not affected by water, aqua regia, chlorosulfonic acid, acetyl chloride, boron fluoride, hot nitric acid, boiling solutions of sodium hydroxide and organic solvents.;Low coefficient of friction; upon heating, weight loss varies from 0.001%/hr at 290 °C to 4%/hr at 450 °C;Only alkali metals and fluorine under pressure attack Teflon below 300 °C;Spun in molten state; density of threads about 2.3; breaking stress can reach 40 kg/sq mm with approx 30% elongation;Does not carbonize in air at 700 °C; at 400 °C = 0.0002% weight loss/hr, at 500 °C = 0.0002% weight loss/hr; at 600 °C = 0.0002% weight loss/hr; at 680 °C = 0.001% weight loss/hr; at 734 °C = 0.006% weight loss/hr; at 788 °C = 0.09% weight loss/hr;Melts to an extremely viscous gel at 327 °C and reverts to the gaseous monomer at temperatures above 400 °C;ODORLESS OR FAINT ODOR; CRITICAL TEMP: 92 °F= 33 °C= 306 DEG K; HEAT OF POLYMERIZATION: -450 BTU/LB= 250 CAL/G= -10.5X10+5 JOULES/KG; CRITICAL PRESSURE: 573 PSIA= 38.9 ATM= 3.95 MN/SQ M; HEAT OF COMBUSTION: -4,000 BTU/LB= -2,000 CAL/G= -90X10+5 JOULES/KG /INHIBITED/;Much heavier than air;Critical density = 0.58 g/cu cm; Heat of evaporation = 16,821 J/mol at -75.6 °C;Henry's Law constant = 0.629 atm-cu m/mol at 25 °C (est);Hydroxyl radical reaction rate constant = 1.13X10-11 cu cm/molec-sec at 298 K;Ozone reaction rate constant = 4.80X10-21 cu cm/molec-sec at 298 K;Nitrate radical reaction rate constant = <3X10-15 cu cm/molec-sec at 298 K
    Rotatable Bond Count
    0
    Stability
    Stable under recommended storage conditions.;The finished polymerized compound is inert under ordinary conditions.
    UNII
    OMW63Z518S
    UN Number
    1081;1081;1081;1081
    Vapor Density
    3.87 (NTP, 1992) (Relative to Air);3.87 (Air = 1);Relative vapor density (air = 1): 3.9;3.87
    Vapor Pressure
    22800 mm Hg at 70 °F (NTP, 1992);2.45e+04 mmHg;2.45X10+4 mm Hg at 25 °C /extrapolated/;Vapor pressure, kPa at 20 °C: 2947;22800 mmHg at 70°F
    XLogP3
    1.3
    MSDS
    Download MSDS
    COA
    Download COA
    Spec Sheet
    Download Spec Sheet
    Case Study

    Free Radical Trapping Behavior of Polytetrafluoroethylene Powder Under Electron Beam Irradiation

    Oshima, Akihiro, et al. Scientific reports, 2021, 11, 1, 10907.

    The effect of irradiation temperature on the radiation-induced fracture reaction of PTFE was discussed from the perspective of free radical trapping behavior.
    · The higher the irradiation temperature, the higher the chain scission efficiency based on C-C bonds.
    · When PTFE is irradiated in an oxygen-free atmosphere, DEA induces the generation of fluoroalkyl radicals.
    · The main chain scission, which is induced by fluoroalkyl radicals, occurs with the β-scission producing Rf -CF3, Rf -CF = CF2 and an end-chain radical.
    · The free radicals captured in PTFE are mainly medium-chain peroxide radicals captured in the crystalline region and quasicrystalline region, or at the interface and interchain region of PTFE.
    · End-chain radicals generated by β-cleavage after dissociative electron attachment (DEA) induce a chain reaction of backbone defluorination, which is enhanced by synergistic thermal and radiation effects.

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