Dielectric Strength

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Table 296. DIELECTRIC STRENGTH OF POLYMERS

(SHEET 1 OF 12)

		Dielectric Strength
		(Short Time, ASTM D149)
Class	Polymer	(V / mil)


ABS Resins; Molded, Extruded	Medium impact	385
	High impact	350—440
	Very high impact	300—375
	Low temperature impact	300—415
	Heat resistant	360—400
Acrylics; Cast, Molded, Extruded	Cast Resin Sheets, Rods:
	General purpose, type I	450—530
	General purpose, type II	450—500
	Moldings:
	Grades 5, 6, 8	400
	High impact grade	400—500

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 296. DIELECTRIC STRENGTH OF POLYMERS

(SHEET 2 OF 12)

		Dielectric Strength
		(Short Time, ASTM D149)
Class	Polymer	(V / mil)


Cellulose Acetate; Molded, Extruded	ASTM Grade:
	H6—1	250—600
	H4—1	250—600
	H2—1	250—600
	MH—1, MH—2	250—600
	MS—1, MS—2	250—600
	S2—1	250—600
Cellulose Acetate Butyrate; Molded, Extruded	ASTM Grade:
	H4	250—400
	MH	250—400
	S2	250—400
Cellusose Acetate Propionate; Molded, Extruded	ASTM Grade:
	1	300—450
	3	300—450
	6	300—450

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 296. DIELECTRIC STRENGTH OF POLYMERS

(SHEET 3 OF 12)

		Dielectric Strength
		(Short Time, ASTM D149)
Class	Polymer	(V / mil)


Chlorinated Polymers	Chlorinated polyether	400
	Chlorinated polyvinyl chloride	1,250—1,550
Polycarbonates	Polycarbonate	400
	Polycarbonate (40% glass ﬁber reinforced)	475
Diallyl Phthalates; Molded	Orlon ﬁlled	400 (dry)
		375 (wet)
	Dacron ﬁlled	376—400 (dry)
		360—391 (wet)
	Asbestos ﬁlled	350—450 (dry)
		300—400 (wet)
	Glass ﬁber ﬁlled	350—430 (dry)
		300—420 (wet)

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 296. DIELECTRIC STRENGTH OF POLYMERS

(SHEET 4 OF 12)

		Dielectric Strength
		(Short Time, ASTM D149)
Class	Polymer	(V / mil)


Fluorocarbons; Molded,Extruded	Polytriﬂuoro chloroethylene (PTFCE)	530—600
	Polytetraﬂuoroethylene (PTFE)	1000—2000
	Ceramic reinforced (PTFE)	300—400
	Fluorinated ethylene propylene(FEP)	2100
	Polyvinylidene— ﬂuoride (PVDF)	260
Epoxies—Molded, Extruded	High performance resins
	(cycloaliphatic diepoxides)
	Molded	280—400 (step)
	Epoxy novolacs
	Cast, rigid	444
Melamines; Molded	Filler & type
	Cellulose electrical	350—400
	Glass ﬁber	250 —300
	Alpha cellulose and mineral	375

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 296. DIELECTRIC STRENGTH OF POLYMERS

(SHEET 5 OF 12)

		Dielectric Strength
		(Short Time, ASTM D149)
Class	Polymer	(V / mil)


Nylons; Molded, Extruded	Type 6
	General purpose	385—400
	Glass ﬁber (30%) reinforced	400—450
	Cast	380
	Flexible copolymers	440
	Type 8	340
	Type 11	425
	Type 12	840
	6/6 Nylon
	General purpose molding	385
	Glass ﬁber reinforced	400—480
	Glass ﬁber Molybdenum disulﬁde ﬁlled	300—400
	General purpose extrusion
	6/10 Nylon
	General purpose	470

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 296. DIELECTRIC STRENGTH OF POLYMERS

(SHEET 6 OF 12)

		Dielectric Strength
		(Short Time, ASTM D149)
Class	Polymer	(V / mil)


Phenolics; Molded	Type and ﬁller
	General: woodﬂour and ﬂock	200—425
	Shock: paper, ﬂock, or pulp	250—350
	High shock: chopped fabric or cord	200—350
	Very high shock: glass ﬁber	375—425
	Phenolics: Molded
Phenolics: Molded	Arc resistant—mineral	350—425
	Rubber phenolic—woodﬂour or ﬂock	250—375
	Rubber phenolic—chopped fabric	250
	Rubber phenolic—asbestos	350
ABS–Polycarbonate Alloy	ABS–Polycarbonate Alloy	500
	PVC–Acrylic Alloy
PVC–Acrylic Alloy	PVC–acrylic sheet	>429
	PVC–acrylic injection molded	400

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 296. DIELECTRIC STRENGTH OF POLYMERS

(SHEET 7 OF 12)

		Dielectric Strength
		(Short Time, ASTM D149)
Class	Polymer	(V / mil)


Polyimides	Unreinforced 2nd value	310
	Glass reinforced	300
Polyacetals	Homopolymer:
	Standard	500
	20% glass reinforced	500
	Copolymer:
	Standard	500
	25% glass reinforced	580
	High ﬂow	500
Polyester; Thermoplastic	Injection Moldings:
	General purpose grade	590
	Glass reinforced grades	560—750
	Glass reinforced self extinguishing	750

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 296. DIELECTRIC STRENGTH OF POLYMERS

(SHEET 8 OF 12)

		Dielectric Strength
		(Short Time, ASTM D149)
Class	Polymer	(V / mil)


Polyester; Thermoplastic (Con’t)	General purpose grade	420—540
	Glass reinforced grade	—
	Asbestos—ﬁlled grade	580
Polyesters: Thermosets	Cast polyyester
	Rigid	300—400
	Flexible	300—400
	Reinforced polyester moldings
	High strength (glass ﬁbers)	200—400
	Heat and chemical resistant (asbestos)	350
	Sheet molding compounds, general purpose	400—440
Phenylene Oxides	SE—100	400 (1/8 in.)
	SE—1	500 (1/8 in.)
	Glass ﬁber reinforced	1,020 (1/32 in.)

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 296. DIELECTRIC STRENGTH OF POLYMERS

(SHEET 9 OF 12)

		Dielectric Strength
		(Short Time, ASTM D149)
Class	Polymer	(V / mil)


Phenylene oxides (Noryl)	Standard	425
	Glass ﬁber reinforced	480
Polyarylsulfone	Polyarylsulfone	350—383
Polypropylene	General purpose	650 (125 mil)
	High impact	450—650
	Asbestos ﬁlled	450
	Glass reinforced	317—475
	Flame retardant	485—700
Polyphenylene sulﬁde	Standard	450—595
	40% glass reinforced	490

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 296. DIELECTRIC STRENGTH OF POLYMERS

(SHEET 10 OF 12)

		Dielectric Strength
		(Short Time, ASTM D149)
Class	Polymer	(V / mil)


Polyethylenes; Molded, Extruded	Type I—lower density (0.910—0.925)
	Melt index 0.3—3.6	480
	Melt index 6—26	480
	Melt index 200	480
	Type II—medium density (0.926—0.940)
	Melt index 20	480
	Melt index l.0—1.9	480
	Type III—higher density (0.941—0.965)
	Melt index 0.2—0.9	480
	Melt Melt index 0.l—12.0	480
	Melt index 1.5—15	480
	High molecular weight	480

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 296. DIELECTRIC STRENGTH OF POLYMERS

(SHEET 11 OF 12)

		Dielectric Strength
		(Short Time, ASTM D149)
Class	Polymer	(V / mil)


Oleﬁn Copolymers; Molded	EEA (ethylene ethyl acrylate)	550
	EVA (ethylene vinyl acetate)	525
	Ionomer	1000
	Polyallomer	500—650
Polystyrenes; Molded	Polystyrenes
	General purpose	>500
	Medium impact	>425
	High impact	300—650
	Glass ﬁber -30% reinforced	396
	Styrene acrylonitrile (SAN)	400—500
	Glass ﬁber (30%) reinforced SAN	515
Polyvinyl Chloride And Copolymers; Molded, Extruded	Nonrigid—electrical	24—500
	Rigid—normal impact	725—1,400

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 296. DIELECTRIC STRENGTH OF POLYMERS

(SHEET 12 OF 12)

		Dielectric Strength
		(Short Time, ASTM D149)
Class	Polymer	(V / mil)


Silicones; Molded, Laminated	Fibrous (glass) reinforced silicones	280 (in oil)
	Granular (silica) reinforced silicones	380 (in oil)
	Woven glass fabric/ silicone laminate	725
	Ureas; Molded
Ureas; Molded	Alpha—cellulose ﬁlled (ASTM Type l)	300—400
	Cellulose ﬁlled (ASTM Type 2)	340—370
	Woodﬂour ﬁlled	300—400

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 297. STEP DIELECTRIC STRENGTH OF POLYMERS

(SHEET 1 OF 3)

		Dielectric Strength, Step by Step
		ASTM D149
			(V/mil)

Class	Polymer	(dry)		(wet)


	Thermoset Carbonate
Thermoset Carbonate	Allyl diglycol carbonate	290
Alkyds; Molded	Putty (encapsulating)	300—350
	Rope (general purpose)	290
	Granular (high speed molding)	300—350
	Glass reinforced (heavy duty parts)	300—350
Diallyl Phthalates; Molded	Orlon ﬁlled	350		325
	Dacron ﬁlled	350—410		350—361
	Asbestos ﬁlled	300—400		250—350
	Glass ﬁber ﬁlled	300—420		275—420

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 297. STEP DIELECTRIC STRENGTH OF POLYMERS

(SHEET 2 OF 3)

		Dielectric Strength, Step by Step
		ASTM D149
		(V/mil)

Class	Polymer	(dry)	(wet)


Epoxies; Cast, Molded, Reinforced	Standard epoxies (diglycidyl ethers of bisphenol A)
	Cast rigid	>400
	Cast ﬂexible	400—410
	Molded	360—400
	General purpose glass cloth laminate	450—550
	High strength laminate	650-750
	High performance resins
	(cycloaliphatic diepoxides)
	Molded	280—400

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 297. STEP DIELECTRIC STRENGTH OF POLYMERS

(SHEET 3 OF 3)

		Dielectric Strength, Step by Step
		ASTM D149
		(V/mil)

Class	Polymer	(dry)	(wet)


Polyesters: Thermosets	Cast polyyester
	Rigid	300—400
	Flexible	300—400
	Reinforced polyester moldings
	High strength (glass ﬁbers)	200—400
	Heat and chemical resistsnt (asbestos)	350
	Sheet molding compounds, general purpose	400—440

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 1 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


ABS Resins; Molded, Extruded	Medium impact	2.8—3.2	2.75—3.0
	High impact	2.8—3.2	2.7—3.0
	Very high impact	2.8—3.5	2.4—3.0
	Low temperature impact	2.5—3.5	2.4—3.0
	Heat resistant	2.7—3.5	2.8—3.2
Acrylics; Cast, Molded, Extruded	Cast Resin Sheets, Rods:
	General purpose, type I	3.5—4.5	2.7—3.2
	General purpose, type II	3.5—4.5	2.7—3.2
	Moldings:
	Grades 5, 6, 8	3.5—3.9	2.7—2.9
	High impact grade	3.5—3.9	2.5—3.0
Thermoset Carbonate	Allyl diglycol carbonate	4.4	3.5—3.8

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 2 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Alkyds; Molded	Putty (encapsulating)	5.4—5.9	4.5—4.7
	Rope (general purpose)	7.4	6.8
	Granular (high speed molding)	5.7—6.3	4.8—5.1
	Glass reinforced (heavy duty parts)	5.2—6.0	4.5—5.0
Cellulose Acetate; Molded, Extruded	ASTM Grade:
	H6—1	3.5—7.5	3.2—7.0
	H4—1	3.5—7.5	3.2—7.0
	H2—1	3.5—7.5	3.2—7.0
	MH—1, MH—2	3.5—7.5	3.2—7.0
	MS—1, MS—2	3.5—7.5	3.2—7.0
	S2—1	3.5—7.5	3.2—7.0

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 3 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Cellulose Acetate Butyrate; Molded, Extruded	ASTM Grade:
	H4	3.5—6.4	3.2—6.2
	MH	3.5—6.4	3.2—6.2
	S2	3.5—64	3.2—6.2
Cellusose Acetate Propionate; Molded, Extruded	ASTM Grade:
	1	3.7—4.0	3.4—3.7
	3	3.7—4.0	3.4—3.7
	6	3.7—4.0	3.7—3.4
Chlorinated Polymers	Chlorinated polyether	3.1	2.92
	Chlorinated polyvinyl chloride	3.08	3.2—3.6
Polycarbonates	Polycarbonate	3.17	2.96
	Polycarbonate (40% glass ﬁber reinforced)	3.8	3.58

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 4 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Diallyl Phthalates; Molded	Orlon ﬁlled	3.9(Dry), 3.3(Wet)	4.1(D), 3.4(W)
	Dacron ﬁlled	3.7–3.8(D), 3.5–3.6(W)	3.9(D), 3.7(W)
	Asbestos ﬁlled	5.2(D), 4.5(W)	6.5 (D), 4.8(W)
	Glass ﬁber ﬁlled	4.1–4.5(D), 3.5–4.5(W)	4.6 (D), 4.4(W)
Fluorocarbons; Molded,Extruded	Polytriﬂuoro chloroethylene (PTFCE)	2.6—2.7
	Polytetraﬂuoroethylene (PTFE)
	(0.01 in thickness)	2.1
	Ceramic reinforced (PTFE)	2.9—3.6
	Fluorinated ethylene propylene(FEP)
	(0.01 in thickness)	2.1
	Polyvinylidene— ﬂuoride (PVDF)
	(0.125 in thickness)	10

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 5 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Epoxies; Cast, Molded, Reinforced	Standard epoxies
	(diglycidyl ethers of bisphenol A)
	Cast rigid	4.02	3.42
	Cast ﬂexible	4.43-4.79	2.78-3.52
	Molded	4.4-5.4	4.1-4.6
	General purpose glass cloth laminate	5.3-5.4	4.7-4.8
	High strength laminate	—	4.8-5.2
Epoxies; Molded, Extruded	High performance resins (cycloaliphatic diepoxides)
	Cast, rigid	3.96—4.02	3.53—3.58
	Molded	4.7—5.7	4.3—4.8
	Glass cloth laminate	—	5.1
Epoxy novolacs	Cast, rigid	3.34—3.39	—
	Glass cloth laminate	4.41—4.43	—

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 6 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Melamines; Molded	Filler & type
	Unﬁlled	7.9—11.0	6.3—7.3
	Cellulose electrical	6.2—7.7	5.2—6.0
	Glass ﬁber	7.0—11.1	6.0—7.9
Alpha cellulose	Alpha cellulose	—	6.4—8.1
	Mineral	—	5.6
Nylons; Molded, Extruded	Type 6
	General purpose	4.0—5.3	3.6—3.8
	Glass ﬁber (30%) reinforced	4.6—5.6	3.9—5.4
	Cast	4	3.3
	Flexible copolymers	3.2—4.0	3.0—3.6

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 7 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Nylons; Molded, Extruded (Con’t)	Type 8	9.3	4
	Type 11	3.3 (103 Hz)	—
	Type 12	3.6 (103 Hz)	—
	6/6 Nylon
	General purpose molding	4	3.6
	Glass ﬁber reinforced	40—44	3.5—4.1
	6/10 Nylon
	General purpose	3.9	3.5
Phenolics; Molded	Type and ﬁller
	General: woodﬂour and ﬂock	5.0—9.0	4.0—7.0
	Shock: paper, ﬂock, or pulp	5.6—11.0	4.5—7.0
	High shock: chopped fabric or cord	6.5—15.0	4.5—7.0
	Very high shock: glass ﬁber	7.1—7.2	4.6—6.6

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 8 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Phenolics: Molded	Arc resistant—mineral	7.4	5
	Rubber phenolic—woodﬂour or ﬂock	9—16	5
	Rubber phenolic—chopped fabric	15	5
	Rubber phenolic—asbestos	15	5
ABS–Polycarbonate Alloy	ABS–Polycarbonate Alloy	2.74	2.69
	PVC–Acrylic Alloy
PVC–Acrylic Alloy	PVC–acrylic sheet	3.86	3.44
	PVC–acrylic injection molded	4	3.4
Polyimides	Unreinforced	4.12	3.96
	Glass reinforced	4.84	4.74

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 9 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Polyacetals	Homopolymer:
	Standard	3.7	3.7
	20% glass reinforced	4	4.0
	Copolymer:
	Standard	3.7 (100 Hz)	3.7
	25% glass reinforced	3.9 (100 Hz)	3.9
	High ﬂow	3.7 (100 Hz)	3.7
Polyester; Thermoplastic	Injection Moldings:
	General purpose grade	3.1—3.3	—
	Glass reinforced grades	3.7—4.2	—
	Glass reinforced self extinguishing	3.7—3.8	—
	General purpose grade	3.16	—
	Asbestos—ﬁlled grade	3.5—4.2	—

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 10 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Polyesters: Thermosets	Cast polyyester
	Rigid	2.8—4.4	2.8—4.4
	Flexible	3.18—7.0	3.7—6.1
	Reinforced polyester moldings
	Sheet molding compounds, general purpose	4.62—5.0	4.55—4.75
Phenylene Oxides	SE—100	2.65	2.64
	SE—1	2.69	2.68
	Glass ﬁber reinforced	2.93	2.92
Phenylene oxides (Noryl)	Standard	3.06—3.15	3.03—3.10
	Glass ﬁber reinforced	3.55	3.41
Polyarylsulfone	Polyarylsulfone	3.51—3.94	3.54—3.7

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 11 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Polypropylene	General purpose	2.20—2.28	2.23—2.24
	High impact	2.20—2.28	2.23—2.27
	Asbestos ﬁlled	2.75	2.6—3.17
	Glass reinforced	2.3—2.5	2—2.25
	Flame retardant	2.46—2.79	2.45—2.70
Polyphenylene sulﬁde	Standard	—	3.22—3.8
	40% glass reinforced	—	3.88
Polyethylenes; Molded, Extruded	Type I—lower density (0.910—0.925)
	Melt index 0.3—3.6	2.3	—
	Melt index 6—26	2.3	—
	Melt index 200	2.3	—

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 12 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Polyethylenes; Molded, Extruded (Con’t)	Type II—medium density (0.926—0.940)
	Melt index 20	2.3	—
	Melt index l.0—1.9	2.3	—
	Type III—higher density (0.941—0.965)
	Melt index 0.2—0.9	2.3	—
	Melt Melt index 0.l—12.0	2.3	—
	Melt index 1.5—15	2.3	—
	High molecular weight	2.3	—
Oleﬁn Copolymers; Molded	EEA (ethylene ethyl acrylate)	2.8
	EVA (ethylene vinyl acetate)	3.16
	Ionomer	2.4
	Polyallomer	2.3

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 13 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Polystyrenes; Molded	Polystyrenes
	General purpose	2.45—2.65	2.45—2.65
	Medium impact	2.45—4.75	2.4—3.8
	High impact	2.45—4.75	2.5—4.0
	Glass ﬁber -30% reinforced	3.1	3
	Styrene acrylonitrile (SAN)	2.6—3.4	2.6—3.02
	Glass ﬁber (30%) reinforced SAN	3.5	3.4—3.6
Polyvinyl Chloride And Copolymers;	Molded, Extruded
	Nonrigid—general	5.5—9.1
	Nonrigid—electrical	6.0—8.0
	Rigid—normal impact	2.3—3.7
	Vinylidene chloride	3—5

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 298. DIELECTRIC CONSTANT OF POLYMERS

(SHEET 14 OF 14)

		Dielectric Constant
		(ASTM D150)

Polymer	Type	60 Hz	106 Hz


Silicones; Molded, Laminated	Fibrous (glass) reinforced silicones	4.34	4.28
	Granular (silica) reinforced silicones	4.1—4.5	3.4 —4.3
	Woven glass fabric/ silicone laminate	3.9—4.2	3.8—397
Ureas; Molded	Alpha—cellulose ﬁlled (ASTM Type l)	7.0—9.5	6.4—6.9
	Cellulose ﬁlled (ASTM Type 2)	7.2—7.3	6.4—6.5
	Woodﬂour ﬁlled	7.0—9.5	6.4—6.9

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 299. DIELECTRIC BREAKDOWN OF POLYMERS

		Dielectric Breakdown, Short Time
			(kV)

Polymer	Type	(dry)		(wet)


Diallyl Phthalates; Molded	Orlon ﬁlled	65—75		60—65
	Dacron ﬁlled	65		60
	Asbestos ﬁlled	55—80		55
	Glass ﬁber ﬁlled	63—70		45—65

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

Table 300. DIELECTRIC BREAKDOWN OF POLYMERS

		Dielectric Breakdown, Step by Step
			(kV)

Polymer	Type	(dry)		(wet)


Diallyl Phthalates; Molded	Orlon ﬁlled	55—60		46—60
	Dacron ﬁlled	60		55
	Asbestos ﬁlled	38—70		39—60
	Glass ﬁber ﬁlled	55—65		45—65

Source: data compiled by J.S. Park from Charles T. Lynch, CRC Handbook of Materials Science, Vol. 3, CRC Press, Boca Raton, Florida, 1975 and

Engineered Materials Handbook, Vol.2, Engineering Plastics, ASM International, Metals Park, Ohio, 1988.

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