EL-CO - Low voltage equipment and industrial ceramic products

Ceramic products specifications

Ceramic Materials	Porcelain	Steatite	Special steatite	Elcoterm	Corderite dense
	compact material based on alumino- silicates	compact material based on magnesium-silicates	compact material with magnesium- silicates	porous material with alumino- silicates	compact material
According to Romanian standard	CER 111 STAS 3471-85	CER 210 STAS 3471-85	CER 221 STAS 3471-85	STR E 5250/1-85	CER 410 STAS 3471-85
According to IEC 60672	C 111	C 210	C 221	---	CER 410
Properties	good electrical mechanical properties and chemical resistance	good electrical and very good mechanical properties	very small dielectric loss coefficient	good resistance to rapid change of temperature	high cordierite, content vitreous
Manufacturing Procedure	wet and dry pressing, extrusion casting	dry pressing extrusion injection	dry pressing isostatic pressing	wet and dry pressing extrusion turning casting injection	dry pressing
Utilization Application	low voltage insulator parts	low voltage insulator parts, small bodies for heating electric devices	special insulator parts sleeves for HRC fuses	ceramic bodies for heating devices used resistor-carrier, products heat treatment kiln used	insulators for fuses, heating element, supports, thermal shock resistant parts


Ceramic Materials		Porcelain	Steatite	Special steatite	Elcoterm	Corderite dense
Technical Characteristics	measure unit
Water absorption	%	---	---	---	max 30	---
Apparent density	Mg^*cm^-3	min 2.2	min 2.3	min 2.7	1.8 ... 2.4	min 2.1
Open porosity	%	max 3	max 0.5	---	---	max 0.5
Flexural strength	MPa	min 40	min 80	min 140	28 ... 40	min 60

Coefficient of linear thermal expansion
30 - 100°C	10⁶K^-1	3 ... 5	6 ... 8	6 ... 8	3 ... 5	1 ... 3
30 - 300°C	10⁶K^-1	3 ... 6	6 ... 8	7 ... 9	3.5 ... 5	1 ... 3
30 - 600°C	10⁶K^-1	4 ... 7	6 ... 8	7 ... 9	4 ... 6	2 ... 4
30 - 1000°C	10⁶K^-1	---	6 ... 8	8 ... 10	---	2 ... 4.5
Specific heat 30 - 100°C	J/K^*kg	800 ... 900	800 ... 900	800 ... 900	max 1300	800 ... 1200
Thermal conductivity 30 - 100°C	W/m^*K	1 ... 2.5	1 ... 2.5	2 ... 3	---	1.2 ... 2.5
Resistance to thermal shock	°K	150	80	100	150 ... 400	250
Relative permittivity 48Hz to 62Hz	---	---	6	6	4 ... 6	5

Dielectric loss coefficient
48Hz to 62Hz	10^-3	---	25	1.5	---	25
1 MHz	10^-3	---	---	---	---	---
1-10 MHz	10^-3	---	7	1.2	---	7

Volume resistivity
20°C	Ω^*cm	10¹⁰	10¹⁰	10¹¹	10¹⁰ ... 10¹²	10¹⁰
200°C	Ω^*cm	10⁶	10⁷	10⁹	10⁶ ... 10⁹	10⁶
600°C	Ω^*cm	10²	10³	10⁵	10⁴ ... 10⁶	10³

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