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Ижевский государственный технический университет им. М. Т. Калашникова

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www.kepital.com

Product Brochure

CONTENTS

1.	General information
1-1.	KEPITAL Nomenclature	03
1-2.	Characteristics of KEPITAL	04
1-3.	Typical properties of KEPITAL	06

2.	Physical and mechanical properties
2-1.	Behavior under short-term stress	10
2-2.	Stress-Strain curve	10
2-3.	Temperature dependency on mechanical properties	10
2-4.	Impact strength	11
2-5.	Shear strength	11
2-6.	Specific volume	11
2-7.	Hardness	12
2-8.	Poisson’s ratio	12
2-9.	Behavior under long-term static stress	13
2-10.	Property to cyclic stress	14

3.	Thermal properties
3-1.	Melting point	15
3-2.	Specific heat	15
3-3.	Heat deflection temperature	15
3-4.	Coefficient of linear thermal expansion	15
3-5.	Thermal conductivity	16
3-6.	Heat ageing	16

4.	Tribological properties
4-1.	Friction	17
4-2.	Wear	17
4-3.	PV Limits	17

5.	Electrical properties
5-1.	Surface resistivity	18
5-2.	Volume resistivity	18
5-3.	Dielectric strength	18
5-4.	Dielectric constant	18
5-5.	Arc resistance	18

6.	Resistance to fuels and chemicals
6-1.	Fuel resistance	19
6-2.	Chemical resistance	19

7.	Resistance to light and weather
7-1.	Light resistance grade	20
7-2.	Weather resistance grade	20

8.	Processing of KEPITAL
8-1.	Equipment	21
8-2.	Injection molding	21
8-3.	Safety recommendation	25
8-4.	Troubleshooting guide	25

9.	UL approval	27

10.	Applications	28

11. Quality, standard accreditation
and environmental management system	34

1. General Information

KEPITAL® is the trade name for the polyacetal copolymer products of Korean Engineering Plastics Co., Ltd. KEPITAL® has well balanced physical and mechanical properties with a good combination of highly crystalline and thermally stable structure. KEPITAL provides not only excellent mechanical and physical properties but also resistance to various chemicals and a wide processing window.

The characteristics of KEPITAL® are as follows:

·High mechanical properties

·High fatigue resistance

·Long-term dimensional stability

·Excellent fuel resistance

·Excellent creep resistance

·Superior friction resistance and wear resistance characteristics

·Superior chemical resistance and alkali resistance

KEPITAL’s product range, from standard unfilled grades to specialties, is well-balanced with inherent properties in order to meet both general purposes and particular requirements.

KEPITAL® is easily processed to manufacture the finished product through the typical processes of both injection molding and extrusion. Therefore, KEPITAL® has been widely used in products such as automotive, electronics, consumer goods, etc.

This brochure provides the physical and chemical properties of KEPITAL, processing information and diverse applications to help chose the right KEPITAL® grade.

1-1. KEPITAL Nomenclature

F xx - OO

1. Grade 2. Flowability 3. Characteristic

1.Grade

(1)Standard unfilled grades: F

(2)Reinforced & filled grades FG: Glass fiber reinforced MF: Milled glass fiber filled FB: Glass bead filled

FT: Whisker filled TC: Talcum filled

(3)Impact modified grades: TE

(4)Low friction and wear grades

FL: PTFE modified

FS, TS: Silicone modified

FM: MoS2 filled

TX, LO, TP: Special lubricant package formulated

2.Flowability

xxMelt Flow Rate (g/10 min)

10		3
15		6
20		9
25		13
30		28
40		52
3. Characteristics
	OO	Characteristic

03/33 Mold released / moderate toughness 03H Higher stiffness and strength than standard

unfilled grade

51UV-stabilized, Black color, outdoor

52UV-stabilized, Natural color, indoor

korea engineering plastics 3

1-2. Characteristic of KEPITAL

Standard unfilled grades

Grades
		Characteristics	Application
Melt Flow Rate		Characteristics	Application
Melt Flow Rate	Name
(g/10min)	Name
(g/10min)

3.0F10 High viscosity (low flow) grade with max Injection molding requiring toughness or extrusion-stock

		toughness without modification	shapes; rod, plate, tube and pipes

6.0	F15	Intermediate flowability between F10	Injection molded parts or extruded rod, plate, tube and pipes
		and F20

9.0	F20	Medium viscosity grade for general	Injection molded parts and extruded shapes with thinner wall
		purpose with well balanced properties	section
		in demanding applications

13	F25	General purpose with slightly higher	Injection molded parts requiring better flow and less critical
		flow property	demand on toughness

28	F30	Low viscosity (high flow) grade	Injection molded parts with geometrically long flow paths, thin
			wall or small shapes out of multi-cavities

52	F40	Ultra high flow grade	Very thin walled or small injection molded parts

Reinforced · Filled grades

Grades		Characteristics	Application

Classification	Name
Classification	Name

Glass fiber reinforced	FG2025K	High rigidity	Parts where improved mechanical strength such as stiffness, fatigue & creep
	FG2015	stiffness	resistance, high HDT etc. is required
	FG2025

Milled fiber filled	MF3025	High stiffness	Parts required of high stiffness with dimensional stability such as low warpage
		Low deformation

Glass bead filled	FB2030	High stiffness	Appropriate molded parts requiring low deformation under elevated tempera-
		Low deformation	ture environment

Talcum filled	TC3020	Dimensional	Application requiring excellent dimensional stability
		stability

Whisker filled	FT2020	High rigidity	Application requiring well balanced stiffness and dimensional stability
		Low strain

Impact modified grades

Grades		Characteristics	Application

Classification	Name
Classification	Name

Impact modified	TE-21	Toughened	General mechanical parts where moderately improved toughness
	TE-22		is required or highly stressed parts where super toughness is
	TE-23		needed.

	TE-24	Highly impact modified
	TE-25

	TE-24S	Super toughened

4 korea engineering plastics

Low friction and wear grades

Grades		Characteristics	Application

Classification	Name
Classification	Name

PTFE modified	FL2010	Low friction and wear	Injection and extruded parts where low friction coefficient and wear
	FL2020		volume are required such as bushes or conveyor belts etc

Silicone modified	FS2022	Low friction and wear	Parts where reduced friction, wear and noise are needed. FS2022 and
			TS-22H are good for parts sliding against plastics
	TS-22H		TS-22H are good for parts sliding against plastics
	TS-22H

	TS-25H		Applications requiring extremely high sliding condition such as high speed,
			high load and high PV limits

MoS2 filled	FM2020	Low friction and wear	Bushes and bearings
	FM2520S

Special lubricant	TP-20	Low friction and wear	Gears, cams and bearings moving against same resin
package		against resin

	LO-21	Low friction and wear	Gears, cams and bearings against metal
		to metal

	TX-11H	Low friction and wear &	Mechanical parts requiring noise reduction and low coefficient of friction
	TX-21	noise reduction	against either plastics or metal under moderate moving condition
	TX-31

	GR-30	Low friction and wear	Mechanical parts where dimensional stability at elevated temperature as
		against metal	well as low friction and wear against metal are needed

UV-stabilized grades

Grades		Characteristics	Application

Classification	Name
Classification	Name

Natural color	F20-52	UV natural	Parts where exposure to UV, such as automotive interiors
	F30-52

	F20-52G	Low gloss	Parts requiring low surface gloss in addition to UV screen
	GD-52

Black color	F20-51	UV black	Parts exposed to UV for non-critical outdoor

	F20-51U	UV black and	Appropriate to use outdoors and in UV exposure environments, in particular
		improved impact	for application with parts requiring improved impact

Conductive, anti-static grades

Grades		Characteristics	Application

Classification	Name
Classification	Name

Conductive	ET-20S	Conductive carbon	Varied applications requiring conductive level of electrical property.
	ET-20A	black powder filled	ET-20A shows superior performance in fuel contact applications

	FA-20	High strength	Parts requiring not only conductivity but also high strength

Anti-static/	FV-30A	Anti-static	Parts in demanding applications for static electricity discharge
static dissipative
static dissipative	ED-10	Static dissipative	Parts requiring suppression of static electricity generation and prevention of
	ED-10	Static dissipative
	ES-20		dust contamination and electrical noise generation

korea engineering plastics 5

1-3. Typical properties of KEPITAL

							Standard unfilled grades
	Description						General				High rigidity
									Low	Extra	High	Medium
				High viscosity		Medium viscosity			Low	low vis-	High	Medium
				High viscosity		Medium viscosity			viscosity	low vis-	viscosity	viscosity
									viscosity	cosity	viscosity	viscosity
										cosity
	Grade
		Test method	Unit	F10-01	F10-02	F15-33	F20-03	F25-03	F30-03	F40-03	F10-03H	F25-03H
Property
	Density	ISO 1183	g/cm3	1.41	1.41	1.41	1.41	1.41	1.41	1.41	1.41	1.41
Physical
properties	Water
	Water	ISO 62	%	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2
	Absorption	ISO 62	%	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2
	Absorption
	Tensile strength	ISO 527	MPa	63	63	65	65	65	65	65	68	68
	Elongation	ISO 527	%	10	10	10	10	9	8	8	12	10
	at yield	ISO 527	%	10	10	10	10	9	8	8	12	10
	at yield
	Nominal strain	ISO 527	%	40	40	35	35	33	25	20	40	32
	at break	ISO 527	%	40	40	35	35	33	25	20	40	32
Mechanical	at break
Mechanical
properties
	Flexural strength	ISO 178	MPa	82	83	84	87	90	90	93	90	94
	Flexural modulus	ISO 178	MPa	2350	2400	2450	2550	2650	2700	2750	2650	2800
	Notched Charpy	ISO 179	KJ/m2	7.0	7.0	7.0	6.5	6.0	5.5	5.0	7.0	6.5
	impact strength	ISO 179	KJ/m2	7.0	7.0	7.0	6.5	6.0	5.5	5.0	7.0	6.5
	impact strength
	Melt flow rate	ISO 1133	g/10 min	3	3	6	9	13	28	52	3	13
	Melting point	ISO 3146	°C	165	165	165	165	165	165	165	168	168
Thermal
properties	Heat Deflection
	temperature	ISO 75	°C	96	96	96	100	100	101	101	100	101
	(1.8 MPa)
	Coefficient of
	linear thermal	ISO 11359	x10-5/°C	12	12	12	12	12	12	12	12	12
	expansion
	Surface resistivity	IEC 60093	Ω	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016
Electrical	Volume resistivity	IEC 60093	Ω · cm	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014
properties	Volume resistivity	IEC 60093	Ω · cm	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014
properties
	Dielectric strength	IEC 60243	kV/mm	19	19	19	19	19	19	19	19	19
Other	Mold shrinkage	KEP	%	2.2	2.2	2.0	2.0	2.0	2.0	2.0	2.2	2.0
Other	(t3 mm, ø100 mm)	(Flow direction)	%	2.2	2.2	2.0	2.0	2.0	2.0	2.0	2.2	2.0
	(t3 mm, ø100 mm)	(Flow direction)

* The information contained in this data sheet is based on our current knowledge and experience, so it may change as new knowledge and experience become available. This information is based on only above-mentioned product produced in Korea Engineering Plastics Co., Ltd.(“KEP”) through relevant test methods and conditions and does not relate to any products made of this product with the inclusion of other additives, such as processing aids or colorants. This information should not be construed as a promise or guarantee of specific properties of this product described or its suitability for a particular application, so users make their own determination as to its suitability to their purpose prior to use this

product. It is the sole responsibility of the users to investigate whether any existing patents are infringed by the use of this product. This product is not intended for use in medical and dental implants and users should meet all safety and health standards. KEP makes no warranty and assumes no liability in connection with any use of this information.

6 korea engineering plastics

				Reinforced & filled grade							Low	friction and wear grade

		Glass reinforced & filled									Silicone modified					Special
							Talcum	Whisker								Special
							Talcum	Whisker	PTFE modified					MoS2 filled		lubricant
							filled	filled	PTFE modified					MoS2 filled		lubricant
					Glass	Milled	filled	filled								package
	Glass Fiber										General	Specialty				package

					Bead	GF
					Bead	GF

FG2025K		FG2015	FG2025		FB2030	MF3025	TC3020	FT2020	FL2010	FL2020	FS2022	TS-22H	TS-25H	FM2020	FM2520S	TP-20

1.47		1.50		1.59	1.64	1.59	1.56	1.59	1.45	1.51	1.40	1.40	1.40	1.43	1.38	1.38

0.2		0.2		0.2	0.2	0.2	0.2	0.23	0.19	0.18	0.2	0.2	0.2	0.2	0.2	0.2

110		120		160	58	78	67	86	55	45	60	65	60	65	58	57

–		–		–	–	–	–	–	9.5	10	12	10.5	8.5	9.5	10	10.5

3.8		3.6		3.0	4.0	4.9	5.6	2.7	14	14.5	48	20	23	20	33	34

160		175		220	97	129	112	146	80	70	82	88	83	90	80	81

4750		5200		8250	4050	5530	5290	6800	2400	2150	2400	2600	2550	2690	2400	2450

6.5		7.0		8.0	2.5	3.8	3.8	3.6	3.5	3.0	8.5	6.5	5.5	5.5	5.5	5.5

13		11.5		7	19	16	5	15	8	5	10	13	24	11	10.5	10

165		165		165	165	165	165	165	165	165	165	165	168	165	165	165

–		–		162	–	–	–	–	–	–	–	98	98	–	–	–

6		5		3	9	9	7	6	13	13	13	13	13	13	13	13

1x1016		1x1016		1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016

1x1014		1x1014		1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014

–		–		23	20	–	21	–	16	16	–	–	–	–	–	–

1.0		0.8		0.5	1.5	1.3	1.6	0.9	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0

korea engineering plastics 7

					Low friction and wear grade					Impact modified grade
	Description
	Description				Special lubricant package					High toughness
					Special lubricant package					High toughness

	Grade
		Test method	Unit	LO-21	TX-11H	TX-21	TX-31	GR-30	TE-21	TE-22	TE-23	TE-24
Property

	Density	ISO 1183	g/cm3	1.39	1.40	1.39	1.39	1.43	1.39	1.37	1.36	1.35
Physical
properties	Water
	Water	ISO 62	%	0.2	0.2	0.2	0.2	0.2	0.22	0.23	0.24	0.24
	Absorption	ISO 62	%	0.2	0.2	0.2	0.2	0.2	0.22	0.23	0.24	0.24
	Absorption

	Tensile strength	ISO 527	MPa	60	64	58	56	48	57	51	45	41

	Elongation	ISO 527	%	10	12	10	8	9	9	11	12	13
	at yield	ISO 527	%	10	12	10	8	9	9	11	12	13
	at yield

	Nominal strain	ISO 527	%	26	40	33	35	40	40	>50	>50	>60
	at break	ISO 527	%	26	40	33	35	40	40	>50	>50	>60
Mechanical	at break
Mechanical
properties
	Flexural strength	ISO 178	MPa	81	86	79	80	66	76	68	60	53

	Flexural modulus	ISO 178	MPa	2450	2550	2350	2400	2150	2150	1900	1650	1450

	Notched Charpy	ISO 179	KJ/m2	5.5	7.5	7.5	7.0	5.5	8.0	11.0	13.0	18.0
	impact strength	ISO 179	KJ/m2	5.5	7.5	7.5	7.0	5.5	8.0	11.0	13.0	18.0
	impact strength

	Melt flow rate	ISO 1133	g/10 min	9.5	5	16	30	20	11	8.5	8	6

	Melting point	ISO 3146	°C	165	168	165	165	165	165	165	165	165
Thermal
properties	Heat Deflection
	temperature	ISO 75	°C	95	97	–	89	–	84	76	76	66
	(1.8 MPa)

	Coefficient of
	linear thermal	ISO 11359	x10-5/°C	13	13	13	13	13	13	13	13	13
	expansion

	Surface resistivity	IEC 60093	Ω	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016
Electrical
Electrical	Volume resistivity	IEC 60093	Ω · cm	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014
properties	Volume resistivity	IEC 60093	Ω · cm	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014
properties

	Dielectric strength	IEC 60243	kV/mm	–	–	–	18	–	–	–	–	21

Other	Mold shrinkage	KEP	%	2.0	2.0	2.0	2.0	1.8	1.9	1.8	1.8	1.7
Other	(t3 mm, ø100 mm)	(Flow direction)	%	2.0	2.0	2.0	2.0	1.8	1.9	1.8	1.8	1.7
	(t3 mm, ø100 mm)	(Flow direction)

8 korea engineering plastics

Impact modified				UV-stabilized grade					Conductive grade			Anti-static/static dissipative
grade				UV-stabilized grade					Conductive grade				grade
grade													grade

High		General		Black		Low gloss		Impact	General		High	General	Specialty
toughness		General		Black		Low gloss		resistance	General		stiffness	General	Specialty

TE-25	TE-24S	F20-52	F30-52	F20-51	F30-51	F20-52G	GD-52	F20-51U	ET-20S	ET-20A	FA-20	FV-30A	ED-10	ES-20

1.34	1.32	1.41	1.41	1.41	1.41	1.41	1.41	1.38	1.38	1.39	1.43	1.41	1.32	1.36

–	0.25	0.2	0.2	0.2	0.2	–	0.2	0.2	–	–	–	–	–	–

39	38	63	63	62	59	58	59	55	40	52	100	63	43	50

14	23	10	9	9	8	11	7	10	4	8	2	8	18	12

>60	>100	35	37	25	35	40	14	40	12	8	2	25	90	50

46	46	83	83	88	86	78	86	75	67	76	135	88	50	70

1250	1300	2350	2450	2650	2650	2350	2750	2250	2650	2450	7150	2580	1350	2000

21.0	28.0	6.0	6.0	7.0	7.0	6.0	4.0	8.5	4.0	5.5	4.0	5.0	16.0	12.0

6	2	10	28	10	25	10	25	10.5	11.5	1	3	29	<1	5

165	165	165	165	165	165	165	165	165	165	165	165	165	165	165

–	61	92	–	–	–	–	–	89	88	92	160	97	–	–

13	13	13	13	13	13	13	13	13	–	–	–	–	–	–

1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x1016	1x103	1x103	1x103	1x1015	1x109	1x1010

1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	1x1014	–	–	–	–	–	–

21	–	19	19	19	19	19	19	19	–	–	–	19	–	–

1.6	1.5	2.0	2.0	2.0	2.0	2.0	–	2.0	1.6	1.8	0.9	2,0

korea engineering plastics 9

2. Physical and mechanical properties

The physical and mechanical properties measured by standard test methods should be the principle guideline to select material from an engineer’s stand point. It is also important to review both short-term (strength, modulus, elongation and impact strength etc) and long-term properties (creep, stress-relaxation and fatigue etc) in determining which material to use. This is because of the fact that plastic materials are affected by varied factors such as temperature, stress and time.

2-1. Behavior under short-term stress

The short-term properties of plastics under a stress are determined by means of stress measurements in tensile/ flexural or sudden blow impact strength, depending on the materials’ characteristics, level of the stress, loading speed, temperature and chemical environment. However, long term properties show time dependent behavior. From the tensile test (ISO 527), such data like elastic Young’s modulus, strength, and elongation at yield and break point can be obtained. Those properties are determined from the stress and strain curve (S-S curves) that shows elastic and plastic behavior of a material under

a dynamic load. When the stresses are removed within the elastic limit, a thermoplastic is capable to recover its original shape. But on the other hand, if the stress is greater than the elastic limit, the material is deformed permanently after reduction of the stress.

Yield point A

Break point B

Stress (S)

Strain (e)

Figure 2-1. Tensile Stress-Strain curve

In the graph, A is the yield point and its yield stress represents the stress limit for elastic strain. B is the break point at which fracture occurs. Tensile strength notes the maximum stress ( max) in the stress-strain curve (S-S curve). Whereas, when fractured before the yield point, the maximum stress is called the tensile strength and there is no yield stress such as in some cases of reinforced and filled grades

10korea engineering plastics

2-2. KEPITAL stress-strain curve

S-S curves of KEPITAL in tensile and maximum stress, representing tensile strength are shown in Figure 2-2 and in the following table.

		(ISO 527, Temp. 23 °C)
Grade	Tensile strength	Testing speed
Grade	(MPa)	(mm/min)
	(MPa)	(mm/min)

F20-03	65	50

FG2025	160	50
TE-24	41	50

Figure 2-2. .Tensile stress-strain curves for KEPITAL (ISO 527, Temp. 23 °C)

Figure 2-3. Flexural stress-strain curves for KEPITAL

(ISO 178, Temp. 23 °C, Testing speed 2.0 mm/min)

2-3. Temperature dependency on mechanical properties

KEPITAL maintains balanced physical and mechanical property characteristics over a wide range of temperatures. Figure 2-4 shows stress-strain curves of tensile tests at various temperatures, and Figure 2-5 shows dependence of the tensile strength on temperatures.

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