Welded seams, no needle holes
Continuous ultrasonic seams mean the rating applies across the entire bag, not just the area between stitches.
STRATA Elements
Felt, mesh and multi-layer filter bags in polypropylene, polyester, nylon, PTFE and Nomex — with seams that do not become the bypass path.
- Retention range
- 1–1,500 µm
- Sizes
- Size 1 (7"×16")
- Standard configurations
- 5
- Industries served
- 6
Overview
Consistent retention, seam to seam.
A filter bag is only as good as its weakest opening, and in most bags that is the seam. Sewn seams leave needle holes larger than the media rating, which quietly bypasses exactly the particles the bag was bought to capture.
STRATA bags are welded, not sewn. Ultrasonic and thermal welding produces a continuous, hole-free seam with the same rating as the media itself, so the stated micron figure applies to the entire bag surface rather than to most of it.
Media is calendered to a controlled depth on rated grades. Uncalendered felt sheds fibre into the filtrate and drifts finer as it compacts; single-side glazing fixes the pore structure and eliminates fibre migration without sacrificing dirt-holding capacity.
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Specifications
Technical envelope
- Micron ratings
- 1, 5, 10, 25, 50, 100, 200, 400, 800, 1,500 µm
- Sizes
- Size 1 (7"×16"), 2 (7"×32"), 3 (4"×8"), 4 (4"×14"), plus custom
- Media
- Polypropylene, polyester, nylon monofilament, PTFE, Nomex, PPS
- Constructions
- Needle felt, monofilament mesh, multifilament mesh, multi-layer composite
- Seam
- Ultrasonic or thermally welded — no sewn seams on rated grades
- Collar options
- Steel, plastic snap-band, sewn-in ring, handle-top
- Temperature limits
- PP 90 °C, PET 150 °C, Nomex 200 °C, PTFE 260 °C
- Surface treatment
- Singed, glazed or calendered to control fibre migration
Configurations
Needle felt (PP/PET)
Depth filtration with high dirt-holding for general process duty.
Monofilament mesh
Surface filtration, washable and reusable, precise cut-point.
Multi-layer composite
Graded density delivering three to five times the life of single-layer felt.
Absolute-rated felt
Calendered with a defined beta ratio for validated retention duty.
High-temperature (Nomex/PTFE)
Hot oil, resin and chemical streams up to 260 °C.
Advantages
What this platform does that a catalogue item does not.
Glazed to stop fibre migration
Controlled single-side calendering fixes the pore structure so the bag does not shed fibre or drift finer in service.
Multi-layer grades that last
Graded-density composites deliver three to five times the service life of equivalent single-layer felt at the same rating.
Collars that seal under load
Snap-band and steel collar geometry is matched to our restrainer baskets so differential pressure cannot lift the seal.
Applications
Where it is installed
- Paint, ink, adhesive and resin filtration
- Plating and surface-treatment bath maintenance
- Edible oil, syrup and beverage clarification
- Machine coolant and parts-washer recirculation
- Municipal and industrial water pre-treatment
- Petrochemical intermediate polishing
Industries
Sectors this platform serves
Technical drawings
Issued with every order
Bag dimensional standards
Size 1 to 4 and extended-length dimensions with tolerances.
Collar interface detail
Snap-band and steel ring geometry against basket seat.
Media specification sheet
Weight, thickness, permeability and rating by grade.
Efficiency curves
Retention against particle size for felt and mesh constructions.
Downloads
Datasheets, CAD and manuals
FAQs
Questions engineers ask about filter bags
Felt filters by depth, holds far more solids and suits deformable particles. Mesh filters by surface, gives a precise cut-point, and is washable and reusable. High solids load points to felt; a sharp, repeatable cut-point points to mesh.
Related platforms
Frequently specified alongside
Next step
Specify the filter bags for your duty.
Send flow, contaminant, rating, chemistry and available pressure. We return a configuration with the sizing basis attached.
Or call +91 79 4890 2200 · sales@worldasatech.com