If you follow filtration the way I do—from HVAC to oil-gas separation—you’ve probably noticed a quiet shift: engineers are asking for higher efficiency without surrendering airflow or budget. That’s exactly where composite fiberglass filter paper keeps popping up in my notes and plant visits.

What it is and why it’s trending

Built from borosilicate micro-glass fibers and reinforced with PET nonwoven, this media balances capture efficiency and pleatability. Many customers say it “just runs calmer” on the line—less fuzz, fewer breaks. To be honest, that’s not trivial at 24/7 converting speeds. Industry chatter suggests two drivers: stricter ePM1 performance under ISO 16890, and the growth of oil-mist and liquid-aerosol control in factories.

Typical process flow (shop-floor version)

• Materials: borosilicate micro-glass, PET nonwoven scrim, acrylic/epoxy binder (8–18%).
• Method: wet-lay fiber dispersion → web formation → PET lamination → binder impregnation → calendering → thermal curing.
• Conversion: edge trimming, roll slitting (up to 1200 mm), pleating trials.
• Testing: basis weight (ISO 536), thickness (ISO 534), permeability (Frazier), efficiency per ISO 16890/EN 1822/ASHRAE 52.2; oil-mist per ISO 12500-1.

Product specification snapshot

Product Name: Composite Fiberglass Filter Paper | Origin: Second Buliding and Studying No21 shiji street, Handan, Hebei China | Filter Grade: um1–um30

Parameter	Typical Range	Notes
Fiber blend	Micro-glass + PET reinforcement	Composite, low lint
Pore/grade	≈ um1–um30	Real-world use may vary
Basis weight	100–220 g/m²	ISO 536
Thickness	0.5–1.2 mm	ISO 534
Efficiency @0.3 μm	H10–H13 optional	EN 1822/ISO 29463
ePM1 (ISO 16890)	60–90%	Depending on basis weight
ΔP @5.3 cm/s	70–160 Pa	Fresh media
Temp resistance	120°C cont., 150°C peak	Dry air
Service life	6–18 months	Load dependent

Where it’s used (quick tour)

– Cleanrooms/paint booths (H10–H13 stages)
– HVAC ePM1 upgrades for offices and hospitals
– Oil-gas separation in compressors and vacuum pumps (ISO 12500-1)
– Liquid pre-filtration for chemicals and food/beverage

Advantages people mention: stable pleating, good dust-holding, and, surprisingly, predictable pressure drop over time. Several buyers told me their operators stopped tweaking pleaters every hour—small win, big mood.

Vendor snapshot (apples-to-apples-ish)

Vendor	Basis Weight	0.3 μm Eff.	MOQ	Certs	Lead Time	Notes
Handan Factory (China)	100–220 g/m²	Up to H13	≈500 m²	ISO 9001, RoHS	10–20 days	Custom PET lamination
EU Supplier A	110–210 g/m²	H10–H13	≈1000 m²	ISO 9001	4–6 weeks	Strong QC docs
US Supplier B	120–200 g/m²	H10–H12	≈800 m²	ISO 9001	3–5 weeks	Fast samples

Customization menu

• Grades: um1–um30; ePM1/ePM2.5 targets or H10–H13.
• Binder: acrylic vs. epoxy; hydrophobic or oleophobic finishes.
• Roll width/ID: 600–1200 mm; cores 3″ or 6″.
• Pleat geometry: support for knife- or rotary-pleat lines.

Field notes and mini case studies

Automotive paint shop, EU: swapping to composite fiberglass filter paper in the final stage cut touch-up defects by ~18% and extended filter change from 8 to 12 weeks. Operators liked the consistent pleat stiffness.

Compressor OEM, APAC: with composite fiberglass filter paper in oil-mist separators, carryover dropped from 2.5 mg/m³ to 0.8 mg/m³ (ISO 12500-1 bench), while ΔP stayed under 120 Pa at nominal flow.

Compliance, testing, and docs

Suppliers typically ship full COA: basis weight, thickness, Frazier permeability, efficiency curves (ISO 16890 or EN 1822), and safety sheets. Look for ISO 9001 QMS and optional RoHS/REACH statements. Service life? I’d budget 6–18 months in HVAC, 1,000–3,000 hours in compressor duty—dust load rules, as always.

References:

1. ISO 16890-1:2016, Air filters for general ventilation.
2. EN 1822-1:2019, High efficiency air filters (EPA, HEPA and ULPA).
3. ASHRAE Standard 52.2-2017, Method of Testing General Ventilation Air-Cleaning Devices.
4. ISO 12500-1:2018, Filters for compressed air—Part 1: Oil aerosols.
5. ISO 9001:2015, Quality management systems—Requirements.