PES (Polyethersulfone)  film possesses a combination of properties such as high resistance to heat and combustibility, low smoke emission and transparency. These coupled with light weight, high tear initiation and propagation strength, dimensional stability, chemical resistance and thermoformability make the film particularly useful in electrical, aerospace, automotive, and mass transit industries.

The following physical property information is based on typical values of the base Ultrason®E resin as well as results from actual film testing. 

Applications for  PES Film:   • Liquid Crystals Displays     • Radomes   • Magnet wire  insulation     • Hot melt adhesives   • Flex circuitry   • High temperature labels

Advantages of PES Film:   • High heat deflection & continuous    use temperature   • Excellent flexural and tensile   strength    • High dielectric strength   • Exceptional mechanical    properties    • Dimensionally stable at   varying temperatures    • Hydrolytically stable    • Transparency

Adhesive Bonding:

 

Adhesives recommended for bonding PES film include:  Epoxy resins, polyurethane, phenolic resins and silicone adhesives. In some cases, surfaces of material to be bonded must be chemically etched or mechanically roughened.  This allows the adhesive to gain a firm grip.  Clamping pressure should be sufficient to ensure good interface contacts but not so high that the parts are deformed or that solvent is forced from the joint.
 

Printing:  PES film can be successfully printed on by laser, silkscreen and pad-transfer techniques.  Pad-transfer printing offers economies resulting from high speed reproduction.

Thermoforming: Can be thermoformed on conventional vacuum or compressed air machines.  Recommended thermoforming temperatures are 518F to 536F.

Light Transmittance:  Where opacity and transparency of films are important, light transmission can be a determining factor for the proper film choice.  Light transmittance = 91%

Heating Sealing:  Dry at 302F prior to heat sealing.  This avoids vapor bubbling and poor bonding at the heated surfaces.  Sealing time is 8 seconds at 460F.

Data Sheet - PES Ultrason®E Film

Mechanical	Unit	ASTM Test	Result
Tensile Strength @yield	psi	D882	10,500
Elongation @break	%	D882	52
Tensile Modulus	psi	D882	-
Flexural Modulus	psi	D790	370,000
Tear Strength -prop,	g/mil	D1004	96
Thermal
Continuous Use Temp.-UL	°F	-	356
Heat Deflection Temperature @264 psi	°F	D648	383
Melt Temp.-DSC	°F	-
Glass Transition Temp.	°F	D3418	437
Flammability
UL Rating-UL94	-	-	-
L.0.1.	%	D2863	38
NBS Smoke	Dmax	E662	-
Electrical
Surface Resistivity	Ohms	D257	>101,
Dielectric Strength @.004"	V/mil	D149	4,600
Dielectric Constant	1 KHz	D150	3.5
Dissipation Factor	1 KHz	D150	0.011
Other
Specific Gravity	-	D792	1.37
Water Absorption	%/24 hr.	D570	0.7
Refractive Index	-	-	1.65
Haze	%	D1003	-
Area Factor	in2/Ib/mil	-	20,000