Anti-Static Polyester Filter for Chemical Industry

 Application industry 

Known as Chemical-Resistant Anti-Static Filter Bags and Conductive Polyester Filtration Bags for Chemicals, this specialized filtration solution is engineered to mitigate the "explosion risk" in chemical processing environments—where combustible dust (e.g., pharmaceutical powders, plastic resins) and static charge buildup create a lethal combination. Constructed from conductive polyester fibers (100% virgin PET with integrated carbon filaments, 2–5% carbon content by weight) via a co-spinning process, these filter bags provide two critical functions: high-efficiency dust collection and essential static dissipation—unlike standard polyester bags, which generate static and can ignite dust clouds.

Maintaining a surface resistance of 10³ to 10⁸ Ω·cm (per ANSI/ESD STM11.11), these anti-static polyester filters safely dissipate static charges (≤0.05mJ) while achieving high filtration efficiency, making them fully compliant with ATEX (2014/34/EU) and NFPA (National Fire Protection Association) standards for combustible dust handling. Unlike coated anti-static filters (which lose conductivity after 50+ cleaning cycles), these bags feature permanently conductive fibers throughout the material structure—ensuring anti-static performance for the entire service life.

 Application Cases 

Anti-Static Polyester Filters are critical in chemical industry environments where combustible dust and static pose explosion risks:

Pharmaceutical Manufacturing: Controls API (Active Pharmaceutical Ingredient) dusts (e.g., penicillin, ibuprofen) in Class II, Division 2 hazardous locations (per NFPA 70), complying with FDA 21 CFR Part 211 (current Good Manufacturing Practices, cGMP).

Fine Chemical Production: Filters combustible organic dusts from pesticide (e.g., glyphosate) and herbicide manufacturing processes—these dusts have low MIE (<0.1mJ) and can ignite from static sparks.

Plastic Processing: Manages polymer dusts from PVC (polyvinyl chloride) and polyethylene production, preventing dust cloud explosions—plastic dust explosions have caused $1M+ in damage to processing plants.

Fertilizer Production: Captures ammonium nitrate and urea dusts, complying with OSHA 29 CFR 1910.178 (combustible dust standard) and DOT regulations for fertilizer handling (ammonium nitrate is a Class 4.1 explosive).

 Product Advantages 

Safety and Filtration Performance

Anti-Static Properties: Continuous conductive network (carbon filaments spaced 0.5–1mm apart) ensures surface resistance remains within 10³–10⁸ Ω·cm, meeting NFPA 652 (combustible dust standard) and ATEX 137 (equipment for explosive atmospheres) requirements—static charge decay time is <0.1 seconds (per ANSI/ESD STM11.21).

Filtration Efficiency: Achieves M13 filtration rating (EN ISO 16890), capturing 99% of particles down to 13μm, including combustible chemical dusts like aspirin API (5–10μm), PVC resin (10–20μm), and ammonium nitrate (5–15μm).

Chemical Resistance: Resists degradation from organic solvents (e.g., ethanol, acetone, ethyl acetate), weak acids (pH 4–6, e.g., acetic acid), and weak alkalis (pH 8–10, e.g., sodium bicarbonate)—tested via ASTM D5432, with no fiber swelling or strength loss after 500 hours of exposure.

Mechanical Strength: Tensile strength of 1600N/5cm (warp direction) with abrasion-resistant construction (ASTM D4157 wear resistance: <3% weight loss after 5000 cycles), suitable for high-velocity dust streams (up to 12 m/s) in chemical mixers.

Operational Safety

Ignition Prevention: Dissipates static charges below the 0.1mJ minimum ignition energy (MIE) for most combustible chemical dusts—for example, PVC dust has an MIE of 0.07mJ, and these bags keep charges below 0.05mJ, eliminating ignition risk.

Temperature Range: Operates safely at -40°C to 135°C (-40°F to 275°F), compatible with most chemical processing environments (e.g., pharmaceutical drying ovens at 80–100°C, plastic extrusion at 120–130°C).

Cleaning Compatibility: Maintains conductivity after 100+ pulse-jet cleaning cycles (6–8 bar pressure), unlike temporary anti-static treatments (e.g., topical sprays) which wash off after 20 cycles.

Grounding Assurance: Integral grounding tab (tinned copper wire, 16 AWG) sewn into the bag top ensures reliable electrical connection to the baghouse frame—grounding resistance is <1Ω, critical for effective charge dissipation.

 Technical Advantages 

Our safety-critical customization ensures compliance and performance, with every step focused on mitigating explosion risk:

Hazard Assessment: Safety engineers evaluate dust MIE (via ASTM E2019 test method) and resistivity (via ANSI/ESD STM11.11) to recommend conductive fiber density—higher carbon content (5%) for dusts with MIE <0.05mJ (e.g., aluminum powder), lower (2%) for MIE >0.08mJ (e.g., urea).

Engineering Design: Customizes dimensions (diameters 120–250mm, lengths 1000–5000mm) and conductive pattern (stripe: 10mm conductive stripes every 50mm; blended: uniform carbon fiber distribution) based on baghouse airflow—blended pattern is recommended for high-turbulence areas.

Conductivity Testing: Samples undergo electrostatic discharge (ESD) testing after 100 wash cycles (simulating cleaning) and 1000 hours of exposure to chemical vapors (e.g., ethanol) to verify resistance remains within 10³–10⁸ Ω·cm—only samples with consistent resistance are approved.

Compliance Documentation: Provides third-party certification from SGS or UL for ATEX and NFPA compliance, including material safety data sheets (MSDS) detailing conductive additives and chemical resistance—critical for regulatory audits.

Production Quality: Manufactured in static-controlled environments (ESD-protected area, EPA <30V) with 100% resistance testing (using a Fluke 1503 insulation resistance tester) before shipment—each bag is labeled with a unique serial number for traceability, and a 5-bag test kit is provided for on-site validation.

 Product Parameters 

This is the temperature under ideal laboratory conditions, and it only represents the physical properties of the fiber. In actual working conditions, due to the chemical components in the flue gas, the continuous temperature requires a certain degree of reduction.

Surface treatment:

▶ Heat setting

▶ PTFE microporous coating