# Sock Filter (SF)

> Fil-Trek Cartridge Filters. Canonical page: https://www.fil-trek.com/products/cartridge-filters/sf

Category: Cartridge Filters
Series: SF
Model format: `SF-[SIZE CODE]-[MICRON]-[MEDIA]-[SOCK]-[CAPS]-[OPTIONS]`
Example: `SF-336-10-CEB-C-C`

## Overview
Rolled-depth sock cartridges, commonly cotton/excelsior, for liquid particulate removal in oil & gas and industrial services. The gradient-depth media provides high dirt capacity and stable performance across 2–100 µm ratings

## How It Works
Outside-in flow through spiral-wound depth media

Gradient-density layers capture large to fine particles progressively

Solids retained within the sock

## Applications
- Liquid particulate removal: lube oils, fuels, amines, glycols, heat-transfer fluids
- Pre-filtration or polishing 
- Oil & gas plant services 

## Physical Specifications
- **flow direction:** Outside-to-inside
- **backwash-able:** No
- **outside diameter options:** 3.0"
- **inner diameter options:** 1.6"
- **nominal length options:** 7.75", 18.6", 24", 30.6", 36.6"
- **end cap options:** DOE, SOE
- **top cap options:** DOE, SOE
- **inner core materials:** Galvanized Steel
- **outer sock:** Cotton, Fiberglass, Orlon
- **size options:** 208, 218, 220, 230, 236

## Media Specifications
- **media primary options:** Cotton String, Cotton/Synthetic Blend, Cotton/Synthetic/Excelsior Blend, White Cotton, Microglass, Polypropylene
- **micron ratings:** 2, 5, 10, 15, 20, 25, 50, 70, 75, 100
- **media rating:** Nominal
- **changeout dp:** 20 PSID
- **burst pressure:** 110 PSID
- **max temperature:** 240°F
- **approvals certifications:** None

## Housing Compatibility
- 3"OD cartridge filter housings

## Competitor Cross-Reference
- Parker TEX-PURE

## Ordering
- Model format: `SF-[SIZE CODE]-[MICRON]-[MEDIA]-[SOCK]-[CAPS]-[OPTIONS]`
- Example: `SF-336-10-CEB-C-C`

### Media codes
- **CS:** Cotton String
- **CB:** Cotton/Synthetic Blend
- **CEB:** Cotton/Synthetic/Excelsior Blend
- **WC:** White Cotton
- **MG:** Microglass
- **PO:** Polypropylene

### Sock codes
- **C:** Cotton
- **O:** Orlon
- **MG:** Microglass

### Cap codes
- **C:** Double Open End
- **CE:** Single Open End

### Option codes
- **SS:** Stainless Hardware

### Size codes
- **208:** OD 3", ID 1.6", length 7.75"
- **218:** OD 3", ID 1.6", length 18.6"
- **224:** OD 3", ID 1.6", length 24"
- **230:** OD 3", ID 1.6", length 30.6"
- **236:** OD 3", ID 1.6", length 36.6"

### Micron ratings
- 2, 5, 10, 15, 20, 25, 50, 70, 75, 100

## Contact
- **sales@fil-trek.com** — all filtration product inquiries, projects, filter housings, and filtration systems
- **filters@fil-trek.com** — replacement filter media, filter elements, filter bags, hardware, and spare parts

## Links
- HTML: https://www.fil-trek.com/products/cartridge-filters/sf
- Markdown: https://www.fil-trek.com/products/cartridge-filters/sf.md