Technical adhesive tapes and films

Polyester (PET)/ CMC 10xxx/12xxx

Manufacturer and trade name	UL file	CTI	Flammability (also DIN 60454)	Thermal class/ Insulation class
Du Pont, Mylar® A	E93687	1	UL 94 VTM-2 / HWI= 5	B
Mitsubishi, Hostaphan® RN	E53895	1*	not measured at 23µm/ 50µm UL 94 VTM-2	B

Polycarbonat (PC)

Manufacturer and trade name	UL file	CTI	Flammability (also DIN 60454)	Thermal class/ Insulation class
Covestro, Makrofol® EN	E168120	3**	UL 94 VTM-2	B

Polyethylene naphthalate (PEN) / CMC 61xxx = PEN

Manufacturer and trade name	UL file	CTI	Flammability (also DIN 60454)	Thermal class/ Insulation class
Toyobo Film Solutions Limited™ (formerly of Teijin), Teonex®.	E51743	3*	UL 94 VTM-2	F

Polyetherimid (PEI)

Manufacturer and trade name	UL file	CTI	Flammability (also DIN 60454)	Thermal class/ Insulation class
Sabic, Ultem®	E103380	4	UL 94-V0 (from 50µm)	F

Perflourethylene propylene (FEP)

Manufacturer and trade name	UL file	CTI	Flammability (also DIN 60454)	Thermal class/ Insulation class
Saint Gobain, Norton FEP	E311412	1*	UL 94-V0 **	F

Polyaramid-Papier / CMC 65xxx = Nomex 

Manufacturer and trade name	UL file	CTI	Flammability (also DIN 60454)	Thermal class/ Insulation class
Du Pont, Nomex® 410, 411, E 56A	E34739	-	UL 94-V0/ HWI=0	H

Polyimide (PI) / CMC 70xxx = Kapton

Manufacturer and trade name	UL file	CTI	Flammability (also DIN 60454)	Thermal class/ Insulation class
Du Pont, Kapton® HN, MT	E39505	4	UL 94-V0/ HWI=0	H

Polyetrafluoroethylene (PTFE) / CMC 75xxx = PTFE

Manufacturer and trade name	UL file	CTI	Flammability (also DIN 60454)	Thermal class/ Insulation class
Du Pont, Teflon®		1		H

Polyetheretherketone (PEEK)

Manufacturer and trade name	UL file	CTI	Flammability (also DIN 60454)	Thermal class/ Insulation class
Victrex, Aptiv™	E161131	4	UL 94 V1 (from 50µm)	H

Polyphenylene sulfide (PPS)

Manufacturer and trade name	UL file	CTI	Flammability (also DIN 60454)	Thermal class/ Insulation class
Toray, Torelina®	E86423	3	UL 94 V0	H

*): CTI value not specified in UL file or not tested by UL

(**): Values apply to the raw material, no specification in UL file

Explanation: Polyester films are usually listed at 105°C (generic value) - Class B for adhesive tapes results from the corresponding tests for adhesive tapes. All films can withstand higher temperatures in the short term (e.g. polyester up to approx. 200°C for hours). The insulating material class specifications refer to long-term application as insulating film in electrical engineering

CTI = tracking resistance 0= >600V (only CMC 278xx, Formex) 1= >400V-600V (e.g. polyester film like Hostaphan or Mylar, Teonex, Kapton FN). 2= >250V-400V 3= >175V-250V (e.g. Aptiv Peek, Nomex) 4= >100V-175V (e.g. Kapton HN)

HAI = High Arc Ignition ; UL 746C = Number of arc ignitions until Ignition of the insulation material 0= >120 1= 60-120 2= 30-60 3= 15-30 4= 0-15

HWI = Hot Wire Ignition, glow wire test; UL 746C Time to ignition in sec. 0= >120 1= 60-120 2= 30-60 3= 15-30 4= 7-15 5= 0-7

Features	Test method	Unit	PEN	PI	PEI	PPS	PET
Tensile strength
Elongation at break
Continuous operating temperature (mech. acc. to UL Yellow Card)	UL-746B	°C	160	200	170	180	105
Continuous operating temperature (electr. acc. to UL Yellow Card)	UL-746B	°C	180	240	180	180	105
Glass transition temperature (film)	TDFJ method by DMA	°C	155	-	212	90	110
Melting point	DSC	°C	269	-	-	2855	258
Breakdown voltage	JIS C-2318	kv/mm	300	280	140	320	280
Dielectric constant	JIS C-2318	-	2,9	3,3	3,2	28	3,1
Water intake	TDFJ method	%	0,3	1,3	0,3	0,02	0,4
Density	JIS C-2151	g/cm³	1,36	1,43	1,27	1,35	1,40
Flammability	UL-94		VTM-2	V-0	V-0	VTM-0	VTM-2

The dielectric strength of polymers changes with frequency, since the increasingly rapid repolarization effects lead to losses in the material. As an example, the change is shown here using the example of polyester film with 12µm and 75µm. With a 12µm thick PET film, the breakdown voltage is reduced by a factor of 8 compared with "normal" 50/60Hz operation. However, these values cannot simply be transferred to other plastics.

For applications requiring particularly high corona resistance, there is Nomex 418 and Kapton CR. Both products achieve highest resistance by adding inorganic insulation materials. Please inquire if you need these films self-adhesive. Due to the small difference of the εr of PTFE and FEP compared to air, these films are especially suitable for partial discharge sensitive assemblies. In addition, the temperature resistance is very good, resulting in a lower temperature influence on the PD insertion voltage.

Nomex 410	60 Hz / 100 kHZ	1.6 (50µm, 80µm) / 1.8
Teonex (PEN)	60 Hz	3,24
Kapton (PI)	1 kHZ	3,9
PTFE and FEP	Frequency independent	2,1
Polyester (PET)	50 Hz / 1 MHz	3,3 / 3,0
Polycarbonate (PC)	50 Hz	3,0
Polypropylene (PP)	50 Hz	2,4
Polyethylene (PE)	50 Hz	2,1
FR4	50 Hz	4,3 - 5,4
Kapton MT	60 Hz	4,2

In many cases, the permeability to water vapor depends on parameters such as film thickness, difference in humidity and temperature. However, some engineering plastics are more suitable as vapor barriers than others. The graph represents a rough guide in terms of water vapor permeability per square meter per day in grams of water.

Material	Glass transition temperature	Melting point	Modulus of elasticity	Density	Thermal conductivity
Polyphenylene sulfides (PPS)	85 to 95 °C	285 to 290 °C	3700 MPa	1.34 to 1.36 g/cm³	(na) W /(m-K)
Polysulfones (PSU)	185 to 190 °C		2500 to 2700 MPa	1.24 to 1.25 g/cm³	0.15 W / (m-K)
Polyetrafluoroethylene (PTFE)	125 to 130 °C	325 to 330 °C	400 to 750 MPa	2.13 to 2.23 g/cm³	0.23 to 0.25 W / (m-K)
Polyvinylidene fluoride (PVDF)	40 °C	170 to 175 °C	2000 to 2900 MPa	1.76 to 1.78 g/cm³	0.19 W / (m-K)
Tetrafluoroethylene / hexafluoropropylene copolymer (FEP)	(na) °C	253 to 282 °C	350 MPa	2.12 to 2.17 g/cm³	0.25 W / (m-K)
Ethylene-tetrafluoroethylene (ETFE)	(na) °C	225 to 275 °C	1100 MPa	1.7 g/cm3	0.23 W / (m-K)
Polyvinyl fluoride (PVF)	-20 to +40 °C	195 to 200 °C	2100 to 2600 MPa	1.37 to 1.39 g/cm³	(na) W / (m-K)
Polyamide 6-3-T (PA6-3T)	149 to 153 °C		2000 MPa	1.12 g/cm³	0.23 W / (m-K)
Polyamide 6/6T (PA6/6T)	60 to 100 °C	250 to 300 °C	3500 to 3600 MPa	1.18 g/cm³	(na) W / (m-K)
Polyetherimides (PEI)	215 to 230 °C		2900 to 3000 MPa	1.27 g/cm³	0.22 W / (m-K)
Polyethersulfones (PES)	225 to 230 °C		2600 to 2800 MPa	1.37 g/cm³	0.18 W / (m-K)
Polyetheretherketones (PEEK)	145 °C	335 °C	3700 MPa	1.32 (semi-cr) 1.27 (am) g/cm³	0.25 W / (m-K)
Polyacryletherketoneetherketoneketones (PEKEKK)	165 to 175 °C	380 to 390 °C	4300 MPa	1.3 g/cm³	0.29 W / (m-K)
Perfluoroalkoxy (PFA)	(na) °C	302 to 306 °C	800 MPa	2.14 to 2.16 g/cm³	(na) W / (m-K)

Impregnating agents from Du Pont Performance Coatings / Wuppertal were tested.
The following resins were tested: vinyl toluene-based (e.g. Voltatex 4130), acrylate-based (e.g. Voltatex 4200), styrene-based (e.g. Voltatex 4001).

CMC adhesive tape	Result
CMC 10260	Very good compatibility
CMC 65100	Very good compatibility
CMC 65120	Very good compatibility
CMC 17719	Very good compatibility
CMC 16701	Very good compatibility*
CMC 16100	Very good compatibility*
CMC 10966 (yellow, colorless)	Very good compatibility

The test was performed as follows:

The adhesive tape was applied to a metal sheet a.) with the adhesive facing the metal sheet and b.) with the adhesive side facing outward. Dipping time in test resin 10 minutes and dripping time 10 minutes.

Visual inspection of the adhesive tape sample and the impregnating agent (e.g. discoloration and swelling).

Then curing of the specimen at 150°C/60 min.

Subsequently, adhesion and tackiness of the two test specimens were evaluated. A general slight to strong tackiness *) was found (adhesive to the outside) when using acrylate-based resins, but this did not affect the function per se.

The influence of the gelling properties after 480 hours was consistently very positive and hardly measurable