Corrosion? Abrasion? About KF Polymer. KF Polymer coating powder provides a corrosion resistant protective coating of from .015 to .050 inches in thickness, impervious to a wide variety of corrosive environments up to 300 º F, and in addition has excellent mechanical properties, such as impact resistance.

KF Polymer-treated objectKF Polymer is a flourocarbon thermoplastic resin (PVF2, polyvinylidene flouride). It is available in fluid bed grade and electrostatic grade for application with conventional techniques.

Performance Characteristics

Chemical Resistance

KF Polymer has outstanding resistance to most in organic acids, alkalies, aliphatic and aromatic hydrocarbons, organic acids, alcohols, halogenated solvents, halogens and strong oxidizing agents.

Spool piece tests of over 11,000 hours in 36% Hydrochloric acid, 93.6% Sulfuric acid and 40% Nitric acid at a temperature of 71 º C (160 º F), at 150 psi pressure, showed no permeation or degradation of KF Polymer. A similar test of 9,000 hours in 36% Hydrochloric acid at a temperature of 104 º C (220 º F) also showed no permeation or degradation.

KF Polymer provides an excellent pin-hole free permeation barrier to small molecules. Access to a KF Polymer coated substrate by corrosives is effectively prevented. Water permeability of polyvinylidene flouride according to ASTM E-96 (gram) (mil) (100in²) (24h) (atm) at 25 º C (77 º F) is 1.56.

Hot fuming Sulfuric acid, some strong basic amines, hot concentrated alkalies and alkaline metals can cause degradation. Slight swelling may occur with use in highly polar solvents, such as acetone and ethyl acetate.

For more detailed information see Technical Data Sheet "KF Polymer--Chemical Resistance".

Physical Properties

KF Polymer has excellent bonding between molecules and shows good mechanical properties in elongation, flexure, tension, compression and impact.

The tensile yield strength is 575kg/cm² (8000 psi), the highest of any of the flourinated polymers. See graph below.

KF Polymer has a high heat distortion temperature. Creep resistance is good. At a stress of 140 kg/cm² and a temperature of 25 º C, the creep rate is 1.5%.

The use temperatures where KF Polymer can be used range from -20 º C (-4 º F) to 150 º C (302 º F). Thermal treatment, such as post-curing, can extend these limits from -60 º C (-76 º F) to 170 º C (338 º F).

Fire Resistance

In actual ASTM D 635 Tests, KF Polymer does not burn freely and self-extinguishes on removal of the flame. It has an oxygen index of 43 (minimum quantity of oxygen, expressed in %, in an atmosphere in which burning could occur), meaning KF will not burn in a normal atmosphere.

UV and Gamma Radiation Stability

Weathering and aging resistance are excellent. KF Polymer shows good gloss holding capacity against ultra-violet radiation. Weatherometer tests indicate no decrease in tensile strangth after exposure to ultraviolet radiation for 3,000 hours.

After exposure to 100 megarads of electromagnetic radiation, KF Polymer showed no decrease in tensile strength.

KF Polymer's stability under ulltraviolet and gamma radiation is unsurpassed by other plastics.

For more specific information on the Physical Properties of KF, see Table 1.

Food Processing Use

FDA. KF Polymer resin conforms to FDA requirements and may be safely used as articles or components of articles intended for use in contact with food. Use environments involving food acids and caustic cleaning at elevated temperatures can be handled. Requirements for food use may be found in the code of Federal Regulations, 21, Food and Drugs, Part 177.2510.

USDA. KF Polymer is chemically acceptable for application to surfaces where there is apossibility of incidental contact with meat or poultry food products prepared under Federal inspection.

It is also acceptable for use on those areas of equipment permitted to be coated in the standard for equipment design and construction published in "Accepted Meat and Poultry Equipment, MPI²".

Caution

KF Polymer is non-toxic in the polymeric state, however, its principal thermal decomposition product, hydrogen flouride, is toxic. Precautions should be taken to prevent inhalation and physical contact should inadvertent decomposition of KF Polymer occur. Waste KF Polymer or coated parts should not be incinerated without adequate fume disposal facilities.

TABLE 1. SUMMARY OF PHYSICAL PROPERTIES
PROPERTY
CONDITION
UNIT
METHOD (ASTM)
KUREHA KF POLYMER
Mechanical
        
Tensile strength
23 C
kg/cm2
D638
500 600
 
100 C
kg/cm2
D638
200 300
Elongation
100 C
%
D638
200 300
Compressive Strength
kg/cm2
D695
900 1000
Flexual Strength
kg/cm2
D790
Tensile Modulus
103 kg/cm2
D638
12 14
Compressive Modulus
103 kg/cm2
D695
10 14
Flexural Modulus
103 kg/cm2
D790
16 18
Izod Impact Strength
Notched, ½" x ½"
Ft. lb in of notch
D256
1.8 2.2
Rockwell Hardness
D785
R 110
Abrasion-Tabor Test Method
Abrasion Disk CS-17, Load 1kg
mg/1000 cycles
9.3
Thermal
        
Thermal Conductivity
10-4 cal/sec/cm2/1(ºC/cm)
C177
3.0
Specific Heat
Room Temp
cal/ºC
0.33
Thermal Coefficient of Linear Expansion
10-5/ºC
D696
12
Head Distortion Temp
4.6kg/cm2
ºC
D648
150
 
18.5kg/cm2
ºC
D648
98
Electrical
        
Volume Resistivity
50%RH/23ºC
ohm-cm
D257
3~6x1014
Dielectric Strength
Short Time, 3.18mm
KV/mm
D149
10
Dielectric Constant
60Hz
D150
9.8
 
103Hz
9.5
 
106Hz
7.5
Dissipation Factor
60Hz
D150
0.05
 
103Hz
0.018
 
106Hz
0.16
Other Properties
       
Specific Gravity
D792
1.76 1.77
Water Absorption
24hrs, 3.18mm
%
D570
0.03
Melting Point
ºC
185
Decomposition Temperature
ºC
350
Crystallization Temperature
ºC
140
Flammability
D635
Self-extinguishing