Insulation Application Alumina Ceramic Sealing Ring / Washer
The description of the ceramic seal ring
Alumina ceramic seal ring is characterized by its extremely high strength, wear resistance, low friction, and chemical stability. The outstanding surface quality (diamond polished surface )on both sides makes it sealing performance as desired. Due to alumina's versatile features, alumina ceramic seal ring could work with various severe service environments well, even if under hot strong acid and alkali, high temperature, high pressure, high voltage / current status. It has a super long service cycle in comparison with metal mechanical seals and reduces the time of maintenance
The ceramic seal ring plays a key role in water, oil, gas sealing system, we always ensure that we manufacture best-quality products through strict quality control in every process, we introduced KPI into our manufacturing flow chart and keep all batches with consistent dimensions.
With over 15 years of manufacturing experience for ceramic seals, we have been supplying a variety of standard components, also we support various customized needs per your technical drawings, specification or practical samples.
The specification of the ceramic seal rings
| Available materials |
95%, 99%, 99.5% alumina, silicon carbide (SiO2) and Silicon nitride (Si3N4) |
| Roughness |
Fine polishing better than Ra0.3, diamond polishing better than Ra0.02 |
| Dimension |
The max. outer diameter up to 500mm |
| Other parameters |
Flatness to be 0.002mm, perpendicularity: 0.005mm, Parallelism : 0.002mm |
| Nominal tolerance |
Size less than 10mm with 0.10mm, size over than 10mm with 1% of dimensions |
| Precision process |
Polishing, fine grinding, CNC machining |
The main features of the ceramic seal ring
1. Superb chemical stability against hot strong acid and alkali and free of rust forever
2. Excellent wear-resistance and abrasion resistance, over 276 times than stainless steel
3. Perfect sliding surface quality: diamond-like surface, the roughness to be Ra0.1
4. High-temperature resistance, stand with over 1500ºC free of deformation
5. Exceptional hardness, the physical hardness is up to 1700MPa
6. Great mechanical properties, hardness, compressive and flexural strength
7. Precise and consistent dimensions every batch via fine grinding, CNC machining
8. Eco-friendly and safe, the material meets FDA, LFGB completely
9.Stable breaking strength, and less variance in figure or dimension
Application of ceramic seals:
Ceramic seal discs are widely used in a variety of water faucet, water tap, sanitary sealing system, regulating system, sealing valves, water /oil/gas pump, and so on.
Technical Datasheet of the ceramic sealing disc
| Property |
Units |
Materials |
| 99.5%Al2O3 |
99%Al2O3 |
95%Al2O3 |
ZrO2 |
Si3N4 |
| Density |
g/cm3 |
≥3.90 |
≥3.85 |
≥3.65 |
≥6.0 |
≥3.2 |
| Water absorption |
% |
0 |
0 |
0 |
0 |
0 |
| Hardness |
HV |
1700 |
1700 |
1500 |
1300 |
1550 |
| Flexural strength |
Mpa |
≥379 |
≥338 |
≥320 |
≥1200 |
≥600 |
| Compressive strength |
Mpa |
≥2240 |
≥2240 |
≥2000 |
≥1990 |
≥2500 |
| Fracture toughness |
Mpa m1/2 |
4-5 |
4-5 |
3-4 |
6.5-8 |
6 |
Max. service temperature
(Non-loading) |
ºC |
1675 |
1600 |
1500 |
1000 |
1200 |
| CTE (20-800ºC) |
1×10 -6 /ºC |
6.5~8.0 |
6.2~8.0 |
5.0~8.0 |
8.0~9.5 |
3.1 |
| Thermal shock |
T(ºC) |
≥250 |
≥200 |
≥220 |
≥300 |
≤1000 |
| Thermal conductivity(25ºC) |
W/m.k |
30 |
29 |
24 |
3 |
15~20 |
| Volume resistivity (25ºC ) |
ohm.cm |
>1 x 10 14 |
>1 x 10 14 |
>1 x 10 14 |
>1 x 10 11 |
>1 x 10 12 |
| Insulation strength |
KV/mm |
19 |
18 |
18 |
17 |
|
| Dielectric constant(1Mhz) |
(E) |
9.7 |
9.5 |
9.5 |
29 |
|
Our advantage and strength
1. 10+ Years of manufacturing experience in OEM, ODM and trusted & professional teams
2. Powerful R&D, prototyping & mass production capability to support trial order and high volume production
3. In-house comprehensive manufacturing types of equipment from raw materials to high precision machining
4. Rigorous quality control system and processes, including IQC, IPQC, QA, OQC in working instructions
5. Surpassing pre-sales, sales, and after-sales service, abide all orders every customer as the first priority
FAQs (Frequently Asked Questions)
Q1. Are you a factory or trading company?
A: We are a manufacturer. You are welcome to visit our factory.
Q2: Do you send a sample to check?
A: Sure, the sample is free and freight collect.
Q3: When will you ship it?
A: If the products are in storage, we'll ship within 48 hours
Q4: When can I get the price?
A: We regularly quote within 24 hours after we get your inquiry. If you are in urgent need of getting the price.
Please call us or tell us in your email so that we will proceed with your inquiry as a priority.
Q5: Is it available to provide customized products?
A: We always support custom-made demand as per different materials, dimensions, and designs.
Q6: How to ensure quality?
A: The dimension out of any batch will be carried out sampling inspection per international AQL standard. A 100% cosmetic inspection will be done.
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