Polymer Melt Candle Filter in 316L Stainless Steel (AISI 316L (1.4404)) is used for filtering polymer melt in continuous polymerization and large extrusion lines with long pleated candles of stainless fiber felt or sintered mesh, hung in a multi-candle housing. The alloy gives superior resistance, including chlorides, brines, food CIP and mild acids and is essentially non-magnetic, with a practical service limit of approx. +550 °C continuous.
Alloy Properties
| Grade designation | AISI 316L (1.4404) |
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| Magnetic response | Essentially non-magnetic |
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| Service temperature | approx. +550 °C continuous |
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| Corrosion characteristic | Superior resistance, including chlorides, brines, food CIP and mild acids |
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Specifications of Polymer Melt Candle Filter Available in 316L Stainless Steel
| Size | Outer diameter (mm) | Length (mm) | Micron rating (u00b5m) | Media | Connection |
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| u00d830 u00d7 250 | 30 | 250 | 10 | Pleated fiber felt | M20 thread |
| u00d860 u00d7 500 | 60 | 500 | 20 | Pleated fiber felt | M24 thread |
| u00d860 u00d7 750 | 60 | 750 | 40 | Pleated sintered mesh | Flat seat |
| u00d880 u00d7 1000 | 80 | 1000 | 25 | Pleated fiber felt | Flange |
Where 316L Stainless Steel Polymer Melt Candle Filter Is Used
- Polyester & nylon polymerization: final melt filters before pelletizing or spinning.
- Film lines: large BOPET and BOPP melt filters.
- Recycling: high-capacity rPET and polyolefin melt filtration.
- Adhesives & resins: hot-melt and resin filtration.
Ordering Polymer Melt Candle Filter in 316L Stainless Steel
- Size & connection: Diameter, length and the thread, flat seat or flange the housing uses.
- Micron rating: 5–60 µm; finer ratings raise pressure and residence time.
- Media & pleat: Fiber felt for dirt capacity, sintered mesh for strength.
Mistakes to Avoid with Polymer Melt Candle Filter
- Re-installing candles without an integrity test after cleaning.
- Mixing candles of different ratings in one housing.
