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  Parylene Properties & Characteristics

     
 


Parylene coatings are completely conformal, of uniform thickness and pinhole free. This is achieved by a unique vapor deposition polymerization process. The advantage of this process is that the coating forms from a gaseous monomer without an intermediate liquid stage.  As a result, component configurations with sharp edges, points, flat surfaces, crevices or exposed internal surfaces are coated uniformly without voids.

 


  Properties

     
 
  • High reliability - Suitable for military or commercial applications
  • Light weight - Compared to other coatings
  • Stress-free coatings - Sensitive circuitry unchanged by coating
  • Low coefficient of friction - Use as a dry film lubricant
  • Transparency - Thin films can be of optical quality
  • Out-gassing - Virtually none
  • Outstanding barrier - Very low permeability to moisture and gases
  • Fungus and bacteria resistance - Excellent
  • Mechanical - High tensile and yield strength
  • Truly conformal - Uniform thickness on all surfaces
  • Wide temperature range - From -200oC to +200oC
  • Radiation resistance - Suitable for space applications
  • Bio-compatible - Inertness invaluable for medical applications
  • Particle retention - Upgrades electronic and mechanical devices
  • Solvent resistance - Insoluble in common solvents
  • Acid and base resistance - Resists attack from exposure
  • Electrical breakdown - Extremely high dielectric strength
     
   

Typical Properties of GALXYL Films

Data recorded following appropriate ASTM methods.

GALXYL Parylene N

GALXYL Parylene C

GALXYL Parylene D

Typical Physical & Mechanical Properties

Tensile strength, psi

65,000

10,000

11,000

Tensile strength, MPa

45

69

76

Yield strength, psi

6,300

8,000

9,000

Yield strength, MPa

2,400

3,200

2,800

Elongation at break, %

40

200

10

Density, g/cm3

1.110

1.289

1.418

Coefficient of friction: static

0.25

0.29

0.33

                                 dynamic

0.25

0.29

0.31

Water absorption, % (24 hr)

0.01 (0.019")

0.06 (0.029")

 

Index of refraction, nD23

1.661

1.639

1.669

Typical Electrical Properties

Dielectric strength, short time (Volts/mil at 1 mil)

7,000

6,800

5,500

Volume resistivity, 23C, 50% RH (Ohm-cm), see chart below

1x1017

6x1016

2x1016

Surface resistivity, 23C, 50% RH (Ohm-cm)

1015

1015

5x1016

Dielectric constant: 60 Hz

2.65

3.15

2.84

1,000 Hz see chart below

2.65

3.10

2.82

1,000,000 Hz

2.65

2.95

2.80

Dissipation factor: 60Hz

0.0002

0.020

0.004

1,000 Hz see chart below

0.0002

0.019

0.003

1,000,000 Hz

0.0006

0.013

0.002

Typical Barrier Properties

 

 

 

Gas Permeability *

 

 

 

Nitrogen

7.7

0.95

4.5

Oxygen

30

7.1

32

Carbon dioxide

214

7.7

13

Hydrogen sulfide

795

13

1.45

Sulphur dioxide

1,890

11

4.75

Chlorine

74

0.35

0.55

Moisture Vapor Transmission**

1.50

0.14

0.25

* cm3-mil/100 in2-24hr-atm (23C)

** g-mil/100 in2-24hr, 37C, 90% RH  1 mil = 1/1000 in = 25.4 microns

Typical Thermal Properties

7.7

0.95

4.5

Melting Temperature, (C)

410

290

380

Linear coefficient of expansion, (10-5 / C)

6.9

3.5

 

Thermal conductivity, 10-4 (cal/sec)/(cm2 C/cm)

3

2

 

 
   

    

 

 
 

Parylene is a vacuum deposited plastic film used to coat many types of substrates.  These coatings provide excellent corrosion resistance, barrier properties and exhibit superior dielectric protection.  Some items already benefiting from Parylene conformal coating include:

 
   
Accelerometers

Bobbins

Capacitors

Catheters

Circuit boards

Coils

Ferrite Cores

Disk Drive Components

Fiber Optic Components

Heat Exchangers

Hybrids

Keypads

Flow Meter Components

Magnets

Pacemakers

Wire

Probes

Photoelectric Cells

P.I.N.D. rejects

Relays

Semiconductors

Sensors

Transformers

Thermistors

Elastomerics

 

 

         

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