Fluoroplastic manufacturers

Fluoroplastics are a range of very unusual and uncommon plastics, here is a simple guide.

Fluoroplastics is a technical word given to a group of plastics where the molecules contain carbon and fluorine. The plastic polythene is a molecule consisting of a carbon chain with hydrogen atoms attached.

Polytetrafluoroethylene - 'PTFE' is much the same but with the hydrogen atoms replaced by fluorine atoms. The replacement of the hydrogen atoms with fluorine atoms dramatically changes the properties of the material, and fluoroplastics therefore tend to have special properties:-

Very high working temperatures. Non-stick characteristics. Very high resistance to chemical and solvents. Very high electrical resistance.

The information below is very general and at Adtech we are very keen to discuss the properties of these materials and to select the best one for your application. There are many subtle differences in these plastics, which if chosen carefully, can give great price/performance benefits.

The more common members of the fluoroplastics family, with which we work, are:-

Chemical Resistance & Technical Data

These materials, known as the noble plastics, are some of the most inert materials known to man. They are unaffected by virtually all chemicals, and certainly most chemicals in industrial use. The few chemicals that are known to have an effect are:

Sodium metal, potassium metal in liquid form, or as reactive complexes which are, in effect, liquid solutions of these metals.

Fluorine and related oxidising compounds such as chlorine trifluoride at elevated temperatures.

There is no known solvent for PTFE, FEP & PFA.

Material

Polymer name
PTFE

Polytetrafluoro-ethylene
FEP

Fluorinated Ethylene Propylene
PFA Perfluoralkoxy ETFE (Tefzel)

Ethylene tetrafluoroethylene
Tensile strength kp/cm³ 250 210 280 450
Elongation % 350 300 300 200
Flexural modulus kp/cm2 6800 6800 1400 1400
Hardness D55 D55 D55 D75
Melting point °C 327 279 305 270
Max. service temp. °C +260 +200 +260 +150
Low service temp. °C -200 -200 -200 -200
Non flammability Rated 94 VO Rated 94 VO Rated 94 VO Rated 94 VO
Water absorption 20°C, % <0.01 <0.01 <0.01 0.01
Weather resistance Excellent Excellent Excellent Excellent
Density g/cm³ 2.1 2.1 2.1 1.7
Dielectric constant 1MHz 2.1 2.1 2.1 2.6
Dissipation factor 0.0002 0.0002 0.0002 0.0008
Resistance against organic solvents Excellent Excellent Excellent Excellent
Resistance against acids and alkalies Excellent Excellent Excellent Excellent
Flexibility Excellent Good Good Good
Radiation resistance, rad. 10-5 10-6 10-6 10-8
Specific Heat cal/g/°C 0.3 0.28 0.29 n/a
Thermal conduct. cal.sec.sq cm/°C/cm 5 x 10-4 5 x 10-4 5 x 10-4 n/a
Coef. of Linear expansion cm/cm/°C 10- 4 9 x 10-5 14 x 10-5 9 x 10-5
Coefficient of Friction (Dynamic to steel) 0.1 0.2 0.2

0.3

IMPORTANT NOTE: This data is intended as a guide and is taken from resin manufacturers' data. Adtech cannot take responsibility for the accuracy of the data, and customers must evaluate the material under the relevant conditions if the properties are critical to their applications.