Crafted for harsh high-temperature environments (up to 120℃), LEFILTER’s High-Temperature String Wound Filter Cartridge integrates premium absorbent cotton/glass fiber media with corrosion-resistant stainless steel skeletons. Its unique outer-loose-inner-dense winding technology not only resists thermal deformation under continuous heat stress but also achieves 90%+ particle retention efficiency for 5–100μm contaminants. Whether filtering hot water in power plants, steam in food sterilization lines, or high-temperature industrial oils in petrochemical facilities, this cartridge maintains stable performance—while supporting repeatable steam cleaning to reduce replacement frequency and operational costs. As a listed enterprise (Stock Code: 837936) with ISO 9001 certification, LEFILTER ensures each unit meets strict industrial quality standards for reliability and safety.
This cartridge features a gradient pore structure formed by controlled winding density: the outer layer (loose winding) captures large particles (50–100μm) to prevent rapid clogging, while the inner layer (tight winding) traps fine contaminants (1–50μm) for deep purification. The media—available in absorbent cotton (for 120℃ max temp) or glass fiber (for 100℃ max temp)—is selected for high thermal stability, ensuring no fiber shedding or media degradation even under prolonged high-temperature operation.
Skeleton Material: 304 stainless steel skeleton (optional 316L for strong corrosion resistance) provides rigid support, avoiding deformation under 0.5MPa max operating pressure.
Seal Technology: Food-grade silicone rubber seals (or EPDM for oil compatibility) ensure zero bypass leakage, even when temperature fluctuates between 5℃–120℃.
Reusability: Compatible with steam sterilization (121℃, 30 mins) and chemical cleaning (5% citric acid for scale, 1% NaOH for organics), extending service life by 2–3x compared to disposable cartridges.
All components meet international safety standards:
Media: Absorbent cotton/glass fiber complies with FDA 21 CFR §177.1520 (food contact).
Skeleton: 304 stainless steel meets ASTM A240 (corrosion resistance for industrial fluids).
Seals: Silicone rubber meets EU 10/2011 (no toxic leaching for food/pharma use).
| Parameter | Details |
|---|
| Filtration Precision | 1μm, 5μm, 10μm, 20μm, 50μm, 75μm, 100μm (customizable) |
| Max Operating Temperature | Absorbent cotton + stainless steel: ≤120℃; Glass fiber + stainless steel: ≤100℃ |
| Operating Pressure | ≤0.5MPa |
| Max Pressure Drop | ≤0.2MPa |
| Outer Diameter | Φ60mm, Φ65mm (±2mm) |
| Inner Diameter | Φ28mm, Φ30mm (±1mm) |
| Length Options | 10” (254mm), 20” (508mm), 30” (762mm), 40” (1016mm) (customizable) |
| Media Options | Absorbent cotton, glass fiber, PP fiber (for ≤80℃ use) |
| Skeleton Material | 304 stainless steel (standard); 316L stainless steel (optional) |
| Seal Material | Silicone rubber (standard); EPDM, NBR, fluororubber (optional) |
The cartridge’s filtration efficiency relies on two key mechanisms, enabled by its gradient winding design:
Hot fluid (e.g., steam, hot oil) enters the cartridge from the outer surface, where the loosely wound media layer (pore size 50–100μm) first intercepts large contaminants—such as rust particles from pipelines, sediment in hot water, or coarse oil residues. This prevents large impurities from blocking the inner fine layer, ensuring consistent flow rate.
After pre-filtration, the fluid flows inward to the tightly wound media layer (pore size 1–50μm). Here, fine particles are trapped via two effects:
Mechanical Interception: Particles larger than the media pores are physically blocked.
Van Der Waals Adsorption: Sub-micron contaminants (close to the pore size) adhere to the media fibers, avoiding breakthrough.
Filtered fluid collects in the inner cavity of the stainless steel skeleton, then exits through the top/bottom ports—delivering purified fluid that meets industrial process requirements. The gradient structure also minimizes pressure drop (≤0.05MPa at full flow), reducing energy consumption for fluid transport.
Use Case: Filtration of high-temperature lubricating oils and hydraulic fluids in refineries, removing wear particles (20–50μm) and oxidation byproducts.
Result: A Shandong refinery extended hydraulic oil change intervals from 6 months to 12 months using 20μm absorbent cotton cartridges, cutting annual maintenance costs by ¥180,000.
Use Case: Steam filtration in aseptic filling lines and hot water filtration for juice sterilization, removing mold spores (10–30μm) and sediment.
Data: A Zhejiang beverage plant achieved NTU <0.5 in sterilized hot water, extending product shelf life by 25% and reducing product waste by 12%.
Use Case: Filtration of hot circulating water in thermal power plants, removing scale particles (50–100μm) to protect heat exchangers.
Impact: A Henan power plant reduced heat exchanger cleaning frequency from once per month to once per quarter, lowering downtime by 70%.
Use Case: Pre-filtration of hot water for injection (WFI) systems, removing fine particles (1–5μm) to meet USP <1231> standards.
Compliance: A Shanghai pharmaceutical company maintained endotoxin levels <0.25EU/ml, passing GMP audits with zero non-conformities.
A1: Match media to your max temperature and fluid type:
Absorbent cotton + stainless steel: ≤120℃ (ideal for hot water, steam).
Glass fiber + stainless steel: ≤100℃ (suitable for hot oils, mild chemicals).
PP fiber + stainless steel: ≤80℃ (cost-effective for low-to-moderate temp water).
A2: Yes—for non-abrasive contaminants, it can be steam-sterilized (121℃, 30 mins) up to 5 times. After sterilization, check for media damage (e.g., fiber shedding) before reinstallation.
A3: It depends on fluid contamination levels:
Clean hot water (power plants): 6–12 months.
High-contamination oil (refineries): 3–6 months.
Replace when pressure drop exceeds 0.2MPa (to avoid media rupture).
A4: Yes—choose 316L stainless steel skeleton + fluororubber seals for strong acid/alkali resistance (pH 2–12). For mild acids/alkalis, 304 stainless steel + EPDM seals work well.
A5: We provide free fluid testing—send a sample of your hot fluid, and our lab will recommend the optimal precision (e.g., 1μm for pharma WFI, 50μm for industrial cooling water).
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