Specifications

Below are standard specifications for glass microfiber filter paper. Items marked Customizable are available upon request.

Request custom specs

Grade	Particle Retention	Thickness (µm)	Weight (g/m²)	Flow Rate	Typical Application
GF/A	1.6µm	260	53	High	Most Common — Air sampling, cell collection, routine filtration
GF/B	1.0µm	500	143	Medium	Highest Loading — High particulate concentration samples
GF/C	1.2µm	260	53	High	Water analysis, algae collection, TSS determination
GF/D	2.7µm	200	30	Very High	Coarse particle pre-filtration, high flow rate applications
GF/F	0.7µm	420	75	Medium	Finest Retention — DNA/RNA adsorption, ultrapure water filtration

Particle retention values are typical (efficiency ≥ 98%).

📌 Customization Notes:
• Custom sizes available (Round: φ 25/47/90/110/150mm; Square: various)
• Special grades or specifications available upon consultation

* Data are typical values, actual parameters may vary slightly by batch.

Product Description

I. Overview

Glass microfiber filter paper is manufactured from high-purity borosilicate glass microfiber using a binder-free process, offering excellent chemical resistance and high-temperature stability (up to 500℃). Features high flow rates, efficient particle retention, and ultra-low metal leaching, making it ideal for air sampling, cell collection, water analysis, and environmental monitoring.

Compared to conventional cellulose filter paper, glass microfiber filter paper offers higher flow rates, lower metal background, and higher temperature resistance, especially suitable for applications requiring high-temperature ignition or trace element analysis.

🔬 Glass Microfiber vs Cellulose Filter Paper:
Glass Microfiber — Binder-free, 500℃ resistant, high flow rate, ultra-low metal leaching, ideal for air sampling, cell collection, gravimetric analysis after ignition.
Cellulose — Binder-containing, 120℃ max, lower flow rate, trace metal content, suitable for routine liquid filtration.

II. Core Performance Parameters

Material: 100% Borosilicate Glass Microfiber, fiber diameter 0.2-5µm
Binder: None (no volatiles at high temperature)
Max Operating Temperature: 500℃ (high-temperature ignition compatible)
Particle Retention Range: 0.7µm (GF/F) ~ 2.7µm (GF/A)
Flow Rate: High (GF/A typical), some grades medium
Metal Leaching: Ultra-low (Pb, Cu, Fe, Zn below detection limits)
pH Range: 0-14 (full range)
Hygroscopicity: Low (glass fiber does not absorb moisture, no drying pre-treatment required)

III. Material & Workmanship

Manufactured from imported high-purity borosilicate glass through high-temperature melting and air jet spinning to produce microfiber. Using wet-laid binder-free forming technology, ensuring fiber-to-fiber physical entanglement provides strength without any chemical binders.

All products are cut and packaged in cleanroom environments to prevent secondary contamination.

Applications

Typical Applications

Environmental Monitoring

Air particulate (PM10/PM2.5) sampling, water TSS determination, wastewater analysis

Life Sciences

Cell collection, algae collection, bacterial filtration, DNA/RNA adsorption

Pharmaceutical

Ultrapure water filtration, pre-filtration before sterile filtration, bacterial endotoxin testing

Food & Beverage

Beverage clarification filtration, microbiological testing

Industrial Testing

Cooling water analysis, boiler water analysis, oil filtration

Industries

Environmental Monitoring Air quality monitoring, water quality analysis, pollution source testing
Pharmaceutical Quality control, pure water system monitoring, microbiological testing
Food Industry Beverage clarification, food safety testing
Research Institutions Environmental science, life sciences, materials science

Application	Recommended Grade	Notes
PM10/PM2.5 Air Sampling	GF/A	1.6µm retention
Water TSS Determination	GF/C	EPA Method 160.2
Algae/Phytoplankton Collection	GF/C	1.2µm retention
Cell Collection	GF/A	1.6µm retention
Ultrapure Water Filtration	GF/F	0.7µm retention
DNA/RNA Adsorption	GF/F	Industry standard

Selection Guide

I. By Particle Retention

Particle Size	Recommended Grade	Typical Application
< 0.7µm	GF/F (0.7µm)	Ultrapure water, DNA/RNA research
0.7-1.2µm	GF/B (1.0µm) / GF/C (1.2µm)	Water analysis, TSS determination
1.2-1.6µm	GF/A (1.6µm)	Air sampling, routine filtration
> 1.6µm	GF/D (2.7µm)	Coarse particle pre-filtration

II. By Application

Air Sampling: GF/A or GF/F (depending on particle size)
Water Analysis/TSS: GF/C or GF/F
Cell Collection: GF/A or GF/C
Algae Collection: GF/C
High Particulate Concentration: GF/B (high loading capacity)
Ultrapure Water Filtration: GF/F
Pre-filtration: GF/D (high flow rate)

III. By Standard Methods

EPA Method 160.2 (TSS): GF/C or GF/F
ISO 7708 (Air Sampling): GF/A or GF/F
ASTM D5907 (TDS/TSS): GF/C
Bacterial Endotoxins Test: GF/F

💡 Selection Tip: GF/A is the most commonly used grade for most air sampling and water filtration applications. For high particulate concentration samples, choose GF/B (high loading capacity). For finest particle retention, choose GF/F. For ultrapure water filtration or DNA/RNA research, GF/F is the industry standard.

Operation & Maintenance

User Guide

Below are standard operating guidelines for glass microfiber filter paper. Proper use ensures optimal filtration performance and experimental results.

I. Pre-use Preparation

Inspect packaging integrity and paper surface for damage or contamination
Glass microfiber paper is brittle — handle with care, avoid folding or creasing
Select appropriate diameter based on filter holder size
For gravimetric analysis, dry at 105℃ for 1 hour, cool to room temperature, and weigh
For trace element analysis, pre-wash with dilute nitric acid (recommended for GF/F)

II. Filtration Operation

Place the filter paper flat in the filter holder (glass or plastic filtration apparatus recommended)
Apply vacuum or pressure for filtration
Slowly pour the sample along the wall, avoiding direct impact on the filter paper surface
Maintain stable vacuum or pressure during filtration
After filtration, rinse the filter paper surface with a small amount of solvent for complete transfer

III. Ignition Operation (Gravimetric Analysis)

Place the filter paper in a crucible and transfer to a muffle furnace
Slowly ramp to 500℃ (heating rate ≤ 100℃/h)
Hold at 500℃ for 30-60 minutes
Remove the crucible, cool in a desiccator to room temperature, and weigh

IV. Important Notes

Glass microfiber filter paper is single-use only
Store in a dry, cool place to prevent moisture absorption
Do not use for hydrofluoric acid (HF) filtration — glass fiber is corroded by HF
Do not use for strong alkaline solutions (pH > 12) — prolonged contact may affect structural integrity
Dispose according to laboratory waste regulations after use

💡 From a Seasoned Lab Technician: "Handle with care, glass fiber is fragile" — Glass microfiber paper is brittle; do not fold or excessively bend, keep it flat.
"Don't over-vacuum" — Vacuum should not be too high (recommended < 0.5 bar), excessive vacuum may damage the paper.
"Dry before ignition" — For high-temperature ignition, first dry at 105℃ to remove moisture, then slowly heat to 500℃.

Care & Notes

Show care & notes

⚠️ Safety & Compliance Checklist

Thermal Safety

Use muffle furnace with heat-resistant gloves and safety goggles

Chemical Safety

Filter corrosive samples in a fume hood

Do not

HF Warning: Do not use glass microfiber paper for hydrofluoric acid filtration
Dust Protection: Avoid glass fiber dust inhalation — wear a dust mask

Glass Microfiber Filter Paper

Specifications

Product Description

I. Overview

II. Core Performance Parameters

III. Material & Workmanship

Applications

Environmental Monitoring

Life Sciences

Pharmaceutical

Food & Beverage

Industrial Testing

Selection Guide

I. By Particle Retention

II. By Application

III. By Standard Methods

User Guide

I. Pre-use Preparation

II. Filtration Operation

III. Ignition Operation (Gravimetric Analysis)

IV. Important Notes

Care & Notes

Thermal Safety

Chemical Safety

Need Glass Microfiber Filter Paper?

Glass Microfiber Filter Paper

Specifications

Product Description

I. Overview

II. Core Performance Parameters

III. Material & Workmanship

Applications

Environmental Monitoring

Life Sciences

Pharmaceutical

Food & Beverage

Industrial Testing

Selection Guide

I. By Particle Retention

II. By Application

III. By Standard Methods

User Guide

I. Pre-use Preparation

II. Filtration Operation

III. Ignition Operation (Gravimetric Analysis)

IV. Important Notes

Care & Notes

Thermal Safety

Chemical Safety

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