Cartridge Heater Ceramics - steatite

Multi-hole technical ceramic insulation stones that form the inner backbone of cartridge heaters. Designed to meet the mold heating needs in heavy industry, plastic injection, and packaging machines, they ensure heating wires are positioned without short-circuiting. Material Options: Steatite (C221) and Cordierite (C520) Application Area: Cartridge heater manufacturing, hot runner systems, medical devices

Category:

Insulation Ceramics

Manufactured from high-purity technical ceramics, cartridge heater stones are the fundamental insulation and conduction elements of cartridge heaters used in heavy industry. Parallel hole channels extending along the cylindrical body allow the incandescent resistance wire to be wound safely and at equal intervals without short-circuiting. With high dielectric strength preventing electricity from leaking to the outer body, these products are widely used in plastic injection molds, packaging machines, hot runner systems, and medical devices. They are supplied in 2, 4, 6, or more hole configurations with countless diameter and length options with millimetric precision to meet specific needs.

Cartridge heater stones are manufactured from two different types of technical ceramics, depending on the technical requirements of the operating environment:

Steatite (C221): Densified by firing between 1280-1350°C during production , this material has an open porosity value of 0.0%. Thanks to the addition of barium carbonate, its mechanical strength is quite high, with a cross-bending strength of 140 MPa. It has a thermal conductivity of 2 - 3 W/m·K and provides a high level of electrical insulation.

Cordierite (C520 - Pyrolit): Based on magnesium-aluminum-silicate minerals, this material exhibits extraordinary resistance to thermal shock thanks to its fine-grained and 20% porous structure. With a maximum operating temperature of 1240°C and a thermal conductivity of 1.3 - 1.8 W/m·K, it is an ideal ceramic for applications experiencing frequent and rapid temperature changes.

Property	Steatite (C221)	Cordierite (C520)	Unit
Open Porosity	0.0	20	vol-%
Density	2.7	1.9	g/cm³
Flexural Strength	140	25	MPa (N/mm²)
Thermal Expansion Coefficient	7 - 9	2 - 4	10⁻⁶ K⁻¹
Thermal Conductivity	2 - 3	1.3 - 1.8	W/(m·K)

Cartridge Stone 100 mm Length Dimensions

Diameter & Holes (Ø)	Diameter & Holes (Ø)	Diameter & Holes (Ø)
6.5 mm 4 holes	16 mm 4 holes	14 mm 6 holes
8 mm 4 holes	17 mm 4 holes	15 mm 6 holes
8.5 mm 4 holes	19.5 mm 4 holes	16 mm 6 holes
9 mm 4 holes	7.5 mm 6 holes	17 mm 8 holes
9.5 mm 4 holes	8.5 mm 6 holes	21 mm 8 holes
10 mm 4 holes	11 mm 6 holes	26 mm 8 holes
11.5 mm 4 holes	12.5 mm 6 holes
13 mm 4 holes	13 mm 6 holes

Cartridge Stone 200 mm Length Dimensions

Diameter & Holes (Ø)	Diameter & Holes (Ø)	Diameter & Holes (Ø)
6.5 mm 4 holes	10 mm 4 holes	16 mm 4 holes
8 mm 4 holes	11.5 mm 4 holes	19.5 mm 4 holes
8.5 mm 4 holes	13 mm 4 holes	16 mm 6 holes

Please contact us for our current price list and custom quotes for your project. For custom and special size orders not listed in the table, please reach out to our expert team.