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The magnesium oxide insulator is used for the cartridge heater, the sheathed heater, and the glow plug, because the magnesium oxide is superior in the electric insulation characteristics (10¹⁴Ω) and the heat conductance (60W・m^-1・K^-1).
The magnesium oxide insulator is used as an insulated core that wraps an exothermic wire and as a guide insulator that guide a metal wire.
Tateho can produce the TATECERA®EMG magnesium oxide insulator of various purities and various densities (=strength).
In addition, Tateho can produce the high purity product and various shape and the size (outside diameter, hole diameter, pitch, and length).
Therefore, if our insulator is used, it becomes easy to produce the heater.
Tateho offers high-quality products with the quality control system based on ISO9001.

As a global trend toward decarbonization intensifies, Battery Electric Vehicles (BEVs) are becoming increasingly popular in each country.
Unlike conventional vehicles with internal combustion engines, BEVs cannot be heated by using exhaust heat from the engine. Therefore, a new heat source is required to replace it.
Due to this, as one of the heat sources for BEVs, heating systems using cartridge heaters, which have an excellent balance between heating performance and power consumption, are beginning to spread.
The cartridge heater used in this heating system utilizes TATECERA^®EMG of magnesium oxide ceramics, which boasts many years of proven and reliable usage.

Properties Table for Main Insulator (Chemical Composition and Physical Properties (Typical))

Grades		TATECERA®️EMG
		TypeA		TypeB
Chemical composition	MgO (%)	99.8		99.1
	CaO (%)	0.05		0.39
	SiO2(%)	0.02		0.29
	Al2O3(%)	0.04		0.13
	Fe2O3(%)	0.02		0.06
	B2O3(%)	＜0.001		0.01
Physical properties	Bulk density(103kg・m-3)	2.3～2.5
	Bending strength (MPa)	20～40

Chemical composition: X-ray fluorescence method
*The properties are the typical values and not the guaranteed values.

Standard Products of Main Insulator TATECERA^® EMG

Tateho has two-holed shape insulators (TypeB) of the following sizes as standard products.

No.	Outside diameter (OD) mm	Hole diameter (D1) mm	Pitch (P) mm	Length (L) mm
1	4.0±0.10	1.0±0.10	1.85±0.10	200.0±1.0
2	5.0±0.10	1.2±0.10	2.30±0.10	200.0±1.0
3	6.0±0.20	1.5±0.10	2.50±0.10	200.0±1.0
4	7.0±0.20	2.0±0.10	2.95±0.10	200.0±1.0
5	8.0±0.20	2.0±0.10	3.70±0.10	200.0±1.0
6	9.0±0.20	1.8±0.10	4.80±0.10	200.0±1.0
7	10.0±0.20	2.2±0.10	4.40±0.10	200.0±1.0
8	11.0±0.20	1.8±0.10	5.55±0.10	200.0±1.0
9	12.0±0.25	3.1±0.10	5.40±0.10	200.0±1.0

Chemical composition: X-ray fluorescence method
*The properties are the typical values and not the guaranteed values.

The Shape List of Main Insulator

Round bar shape insulator

The round bar shape insulator is used for the glow plug for the diesel engine to decide the position of an exothermic wire.

Size
Outside diameter (OD) mm	0.5～10.0
Length (L) mm	20～100

*Tateho can produce it in 0.1 mm

One holed shape insulator (Pipe Tube)

The one holed shape insulator is used for the long sheath heater to prevent an exothermic wire from contacting with sheath.

Size
Outside diameter (OD) mm	1.2～18.0
Hole diameter (D1) mm	0.6～10.0
Length (L) mm	50～200

*Tateho can produce it in 0.2 mm

Two holed shape insulator

The two holed shape insulator is used for the cartridge heater as an insulated core that wraps an exothermic wire.

Size
Outside diameter (OD) mm	1.4～30.0
Inside diameter (ID) mm	0.4～4.5
Length (L) mm	50～200

*Tateho can produce it in 0.1 mm.

Four holed shape insulator

The four holed shape insulator is used for the cartridge heater that builds in the thermocouple and that insert an exothermic wire in the hole of it.

Size
Outside diameter (OD) mm	2.1～20.0
Inside diameter (ID) mm	0.35～4.0
Length (L) mm	100～200

*Tateho can produce it in 0.2 mm.
*The combination of different hole diameters is possible.

Six holed shape insulator

Tateho can produce the thermocouple integration type and zone division type etc. according to the design of the customer.

Size
Outside diameter (OD) mm	4.5
Inside diameter (ID) mm	0.6
Length (L) mm	100

*Tateho can produce it in 0.2 mm.
*Tateho can produce more than six holes.

Non-round bar shape insulator

Tateho can produce the insulator of non-round bar shape according to the design of the customer.

Size
Width（W）mm	43.0
Thickness（T）mm	6.5
Length (L) mm	200
Hole diameter（D1）mm	3.5

*This is an example of non-round bar shape insulator.
*Tateho can produce it in 0.2 mm.

Shape List of Guide Insulator TATECERA^® PMG

Bottom shape guide insulator

The bottom shape guide insulator is used for the tip of the cartridge heater to fix a main insulator.

Size
Outside diameter (OD) mm	2.9～29.0
Inside diameter (ID) mm	主碍子の外径
Height（H）mm	2.0～5.0
Depth（h）mm	1.0～3.0

*Tateho can produce it in 0.2 mm.

The special shape guide insulator is used for the intermediate part of the cartridge heater to prevent a metal wire from contacting with sheath.

*Tateho can produce it according to request size or shape.