Medium Temperature MgO (Moisture-proof)

Category：Medium Temperature Magnesium Oxide
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Release time：2026-09-05 16:32:16

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Product description

Medium Temperature MgO (Moisture‑proof)

Medium temperature magnesium oxide powder, with added silicone oil, offers a certain degree of moisture resistance. These products are mainly used in heating elements for air and liquid heating at medium working temperatures, such as pre‑blackened tubes, water heaters and oven heaters.

● Chemical Analysis (%)

Grade / Composition	MgO	CaO	Fe₂O₃	SiO₂	Al₂O₃	LOI
ZSM‑H	≥96.5	≤1.5	≤0.8	≤2.0	≤1.0	≤0.3
ZSM501	≥96	≤1.5	≤0.8	≤2.0	≤1.0	≤0.3
ZSM502	≥95.5	≤2.0	≤0.8	≤2.0	≤1.0	≤0.3
ZSM500	≥95	≤2.0	≤0.8	≤2.0	≤1.0	≤0.3

● Physical Properties

Grade	Flow Rate (s/100g)	Flow Time (s/100g)	Tap Density (g/cm³)
ZSM‑H	150‑190	32‑42	2.30‑2.45
ZSM501	150‑190	32‑42	2.30‑2.45
ZSM502	160‑200	35‑45	2.30‑2.45
ZSM500	150‑190	32‑42	2.22‑2.40

● Particle Size Distribution (%)

Grade	+40	+60	+80	+140	+200	+325	-325
Particle Size(μm)	+425	+250	+180	+106	+75	+45	-45
ZSM‑H	≤1	20‑40	8‑20	20‑40	10‑20	5‑15	0‑3
ZSM501	≤0.5	30‑50	8‑20	15‑35	5‑15	5‑15	0‑3
ZSM502	≤0.5	20‑40	8‑20	20‑40	10‑20	5‑15	0‑3
ZSM500	≤0.5	20‑40	8‑20	20‑40	10‑20	5‑15	0‑3

Note: The +425 μm and -45 μm particles is strictly controlled within standard limits. To ensure tap density and flow rate, the content of other particle sizes may exceed the aforementioned range. (Customization available upon request for special requirements.)

● Electrical Properties

Grade / Surface Loading	5w/cm²	6w/cm²	7w/cm²	Suggested Working Temp.
	Leakage Current Typical Value (mA)
ZSM‑H	0.01	0.12	0.20	≤600℃
ZSM500	0.06	0.16	0.24	≤500℃
ZSM501	0.06	0.15	0.26	≤500℃
ZSM502	0.06	0.16	0.27	≤500℃

● Test Conditions

1.Tube Material: SUS304, length of 430mm
2.Wire Material: Ni80Cr20, φ0.25mm, spiral φ2.5mm
3.Rolling: φ10.0mm→φ8.2mm
4.Effective Heating Length: 410‑440mm
5.Power on Time:20min
*The properties are the typical values and not the guaranteed values.

● Packaging

25kg in a woven bag or carton box. Special Package is available on requirements.

● Usage and Storage Instructions

1. This product series cannot withstand 1050℃ annealing.
2. Prior to sealing, 3‑5 hours of moisture removal at 250‑380℃ is recommended for heating elements.
3. Electrical grade MgO powder is non‑toxic, but with some dust. It is recommended to wear anti‑dust respirators and gloves during operation.

4. Electrical‑grade magnesium oxide powder should be stored in a well‑ventilated, dry area away from direct sunlight. It is recommended to use the product within 12 months after delivery.

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