Polytetrafluoroethylene preparation , 60wt%dispersing solution , 9002-84-0

Synonym(s):
PTFE;Fluoropolymer;PTFE dispersion;Sampling dippers;Stopcocks

CAS NO.：9002-84-0

Empirical Formula: (C2F4)n

Molecular Weight: 0

MDL number: MFCD00084455

EINECS: 618-337-2

PRODUCT Properties

• Melting point: 327 °C
• Boiling point: 400 °C
• Density: 2.15 g/mL at 25 °C
• refractive index: 1.35
• storage temp.: Store at -20°C
• solubility: Solubility in water:
• form: powder
• Specific Gravity: 2
• color: white
• Odor: at 100.00?%. odorless
• Water Solubility: Insoluble in water. Soluble in perfluoro kerosene.
• Merck: 14,7562
• Dielectric constant: 2.0（Ambient）
• Stability: Stable - unreactive with most materials. Incompatible with molten alkali metals, fluorine and other halogens, strong oxidizing agents.
• IARC: 3 (Vol. 19, Sup 7) 1987
• NIST Chemistry Reference: Polytetrafluoroethylene, annealed(9002-84-0)
• EPA Substance Registry System: Polytetrafluoroethylene (9002-84-0)

Description and Uses

Tetrafl uoroethylene (TFE), also known as perfl uoroethylene, is a colorless, fl ammable, toxic gas. It is the monomer used for polytetrafl uoroethylene (PTFE), which is sold under the DuPont tradename of Tefl on. TFE is co-polymerized with other compounds to produce a variety of Tefl ons. TFE is produced by heating chlorodifl uoromethane (CHClF2, Freon-22) or trifl uoromethane (CHF3, Freon-23). TFE is used almost exclusively as a monomer in the production of PTFE. PTFE is a vinyl polymer, which means it is made from a monomer with carbon-carbon double bonds. PTFE is made from TFE by free radical polymerization.
PTFE’s unique physical properties are due to its chemical structure. PTFE consists of long chains of carbon atoms surrounded by fluorine atoms. The fluorine atoms act as a protective barrier that shields the carbon-carbon bond from chemical attack. The fluorine atoms repel other atoms, making it diffi cult for anything to stick to PTFE. PTFE resins have very low coeffi cients of friction (< 0.1). The strong fluorine-to-carbon bonds and high electronegativity of fluorine make PTFE very stable. The long chains of PTFE pack closely together to give a dense crystalline solid. The packing, which can be compared to stacking boards, produces little cross-linking.

Inert lubricant.

Safety

• Symbol(GHS): GHS05
• Signal word: Danger
• Hazard statements: H318
• Precautionary statements: P280-P305+P351+P338
• Hazard Codes: Xi,T,Xn
• Risk Statements: 41-36/38-45-48/20
• Safety Statements: 26-39-24/25-45-22-53-23
• WGK Germany: 3
• RTECS: KX4025000
• Hazard Note: Irritant
• TSCA: Yes
• HS Code: 39046100
• Hazardous Substances Data: 9002-84-0(Hazardous Substances Data)