Core Definition
Internal O-ring insert high-temperature filter cartridges are high-temperature filter elements with insert mounting structure. An O-ring seal is fitted on the inner side of the filter end cap. The cartridge is directly inserted into the sleeve of the equipment filter chamber, and radial sealing is formed between the O-ring and the inner wall of the sleeve. Featuring simple structure and convenient installation, this connection form is mainly applied to high-temperature printing upgrading of early-version SLM 280, EOS M280 and other equipment.
This product adopts high-temperature resistant glass fiber filter media, matched with high-temperature resistant FKM O-rings and high-temperature hot melt adhesive, with an operating temperature range of 150–200℃. It reaches H13 filtration grade as per EN 1822 standard, with filtration efficiency ≥99.95% for 0.3μm particles. The internal O-ring insert design enables easy filter replacement even under high-temperature conditions; simply push the cartridge fully into position to complete installation.
Core Technical Advantages
Concise internal O-ring insert design: The filter cartridge is directly inserted into the filter chamber sleeve without additional fasteners such as chucks or flanges. Installation remains easy under high temperatures, making it suitable for equipment with compact internal space.
High-temperature resistant radial O-ring sealing: The O-ring is made of fluoroelastomer (FKM), tolerating temperatures up to 200℃ without hardening or losing elasticity after long-term service. It forms radial compression sealing against the sleeve inner wall after insertion to deliver reliable tightness at high heat.
High-temperature hot melt adhesive bonding: High-temperature resistant epoxy resin is used to bond end caps and filter media. It boasts excellent thermal stability after high-temperature curing, with no debonding or delamination under long-term operation at 150℃.
High-temperature resistant filter media system: Constructed with high-temperature resistant glass fiber media for continuous service at 150–200℃ and instantaneous temperature resistance up to 250℃. The media will not shrink or soften at high temperatures to maintain stable filtration precision.
Stainless steel supporting frame: The inner support frame adopts 304 stainless steel perforated mesh, resisting deformation, oxidation and corrosion under high temperatures.
Working Condition Matching Table
| Applicable Equipment | Operating Temperature | O-ring Material | Filtration Grade | Recommended Replacement Cycle |
| Early SLM 280 (High-Temperature Upgrade) | 120–180℃ | Fluoroelastomer | H13 | 1000–1500 h |
| EOS M280 (High-Temperature Upgrade) | 120–150℃ | Fluoroelastomer | H13 | 1000–1500 h |
| Other Insert-Type Equipment | Customized on Demand | Fluoroelastomer / Silicone Rubber | H13 | Subject to Actual Conditions |
Application Fields
High-Temperature Printing Equipment with Insert Structure
Applicable Materials:
Titanium Alloy (High-Temperature Preheating Printing)
Nickel-Based Alloy
Stainless Steel (High-Temperature Process)
Case & Data Verification
Case: High-Temperature Printing Upgrade of SLM 280 in a Scientific Research Institute
An early-version SLM 280 machine of a research institute was used for titanium alloy printing with 120℃ preheating. The original standard filter failed due to hardened O-rings under high heat. After replacement with internal O-ring insert high-temperature filter cartridges fitted with FKM O-rings, the system maintained sound sealing without leakage and stable filtration efficiency after 1200 hours of continuous operation.
FAQ
Q1: What precautions should be taken during installation of internal O-ring insert high-temperature filter cartridges?
A: Inspect the O-ring for intactness and damage before installation; apply a small amount of high-temperature grease to facilitate insertion; push the cartridge until obvious bottom contact is felt. The O-ring will thermally expand at high temperatures, so over-tight installation is unnecessary.
Q2: How to choose between FKM and silicone rubber O-rings?
A: Fluoroelastomer (FKM) withstands up to 200℃ with outstanding oil and chemical resistance, which is the preferred option for high-temperature printing scenarios; silicone rubber has slightly lower temperature resistance (max 180℃) yet better flexibility. FKM is recommended.
Q3: Will internal O-ring insert filters loosen due to thermal expansion and contraction under high temperatures?
A: No. FKM O-rings expand moderately at high temperatures to enhance sealing performance. The product design has matched thermal expansion coefficients in advance.
Q4: Should O-rings be replaced together with filter cartridges?
A: Yes. O-rings will harden after long-term high-temperature service and must be replaced alongside new cartridges. Used sealing rings cannot be reused.
