Bio-soluble fiber paper (AES paper) is an engineered high-temperature insulation sheet manufactured from alkaline earth silicate fibers (CaO + MgO ≥ 18%), providing continuous thermal service up to 1200°C without classification as a carcinogen under European Directive 97/69/EC (Nota Q). With tensile strength exceeding 0.35 MPa, bulk density between 180 and 220 kg/m³, and standard thicknesses from 0.5 mm to 10 mm, it provides a direct, REACH-compliant replacement for traditional refractory ceramic fiber (RCF) papers in industrial gaskets, burner seals, and thermal shields across European and North American markets.
For plants operating under strict occupational health standards or exporting machinery into regions with stringent worker-exposure regulations, bio-soluble paper eliminates the handling and hazardous waste disposal restrictions associated with aluminosilicate fibers. Below are the key metallurgical parameters, grade distinctions, die-cutting behavior, binder burnout characteristics, and procurement specifications for factory-direct sourcing.
The Low Biopersistence Chemistry: Why European Buyers Specify AES
The critical difference between standard refractory ceramic fiber (RCF) and bio-soluble paper lies in its chemical solubility inside human alveolar lung fluid. Traditional RCF consists of stable aluminosilicate vitreous fibers (Al₂O₃ 45–50%, SiO₂ 50–55%). If inhaled, these fibers persist indefinitely in lung tissue, triggering Category 1B carcinogen classifications and strict airborne monitoring under EU CLP and OSHA regulations.
Bio-soluble paper solves this compliance hurdle through an alkaline earth silicate (AES) chemistry:
Silica (SiO₂): 60–70%
Calcium Oxide (CaO): 25–32%
Magnesium Oxide (MgO): 3–7%
Total Alumina & Iron Impurities (Al₂O₃ + Fe₂O₃): ≤ 1.0%
When inhaled fibers contact simulated alveolar lung fluid (pH 7.4), calcium and magnesium ions leach out rapidly. The silica chain hydrolyzes into short, sub-critical fragments that alveolar macrophages clear naturally. Standard laboratory animal biopersistence tests verify a weighted clearance half-life (T1/2) of under 10 days, meeting European Note Q exoneration rules.
Our export customers in Germany, the UK, and Scandinavia specify certified china soluble fiber paper to eliminate the high disposal costs and regulatory paperwork associated with classified RCF waste during furnace relines.
Technical Specifications: 1100°C vs. 1200°C Performance Limits
We produce two standard commercial grades tailored to continuous operating requirements. Key properties are summarized below:
1. Standard 1100°C Grade
Engineered for general appliance, boiler door, and heat shield applications operating below 1000°C.
Classification Temperature: 1100°C (Continuous service: ≤ 1000°C)
Bulk Density: 180–210 kg/m³
Longitudinal Tensile Strength: ≥ 0.35 MPa (ASTM D828)
Transverse Tensile Strength: ≥ 0.28 MPa
Organic Binder Content (LOI): ≤ 8.5%
Linear Shrinkage (24h at 1000°C): ≤ 3.0%
Thermal Conductivity: 0.08 W/m·K at 400°C; 0.15 W/m·K at 800°C; 0.21 W/m·K at 1000°C
2. High-Temperature 1200°C Grade
Formulated with optimized calcium-to-magnesium ratios to resist devitrification and maintain fiber resilience in demanding industrial burner environments.
Classification Temperature: 1200°C (Continuous service: ≤ 1100°C)
Bulk Density: 200–230 kg/m³
Longitudinal Tensile Strength: ≥ 0.45 MPa
Transverse Tensile Strength: ≥ 0.35 MPa
Organic Binder Content (LOI): ≤ 7.0%
Linear Shrinkage (24h at 1100°C): ≤ 2.5%
Thermal Conductivity: 0.07 W/m·K at 400°C; 0.14 W/m·K at 800°C; 0.19 W/m·K at 1000°C
Traditional RCF vs. Bio-Soluble Paper: Practical Trade-offs
Can bio-soluble paper serve as a direct 1:1 replacement across all furnace locations? Here is our engineering assessment from field experience:
Thermal Limits: For operating temperatures under 1100°C-which represents about 80% of flange gasket, sight glass, and expansion joint needs-bio-soluble paper provides thermal performance identical to standard RCF paper. However, for continuous furnace environments exceeding 1250°C, high-zirconia ceramic fiber or specialized ceramic fiber blanket for furnace lining remains necessary.
Compressibility and Sealing: Bio-soluble fibers possess slightly lower elastic moduli than aluminosilicate needles. Under modest bolt seating stress (0.1–0.3 MPa), bio-soluble paper conforms better to rough steel plate joints, producing a tighter seal on fabricated sheet-metal housings.
Regulatory Savings: Bio-soluble materials avoid hazardous waste classifications, eliminating special disposal permits and reducing air-monitoring overhead on shop floors.
Critical Applications & Precision Die-Cut Tolerances
Bio-soluble paper delivers reliable thermal and acoustic insulation across multiple industrial sectors:
Primary Industrial Uses
Commercial Burners and Boilers: Compressible sealing around burner mounting plates, combustion inspection ports, and exhaust dampers subject to cycling thermal shock.
Automotive & Exhaust Heat Shields: Flexible decoupling wraps around catalytic converters, exhaust manifolds, and turbochargers meeting global end-of-life vehicle (ELV) environmental mandates.
Non-Ferrous Molten Aluminum Launders: Molten aluminum at 750°C will not wet or react with AES fibers, making this paper an effective parting liner over backup high density calcium silicate board.
Kiln Masonry Expansion Joints: Placed as 2mm to 3mm compression spacers between courses of high temperature refractory bricks, preventing mortar debris buildup while accommodating brick expansion.
Die-Cutting & Fabrication Capabilities
Most customers purchase bio-soluble paper in custom die-cut gasket formats. Utilizing automated CNC oscillating knife tables and high-precision steel rule dies, we maintain strict manufacturing tolerances:
Inner and Outer Diameters: Controlled to ±0.5 mm.
Hole Centering & Bolt Patterns: Maintained within ±0.3 mm.
Thickness Consistency: Within ±10% across master roll widths.
Surface Options: Single-sided pressure-sensitive adhesive (PSA) backing is available to simplify vertical positioning on furnace door frames prior to bolting.
Organic Binder Burnout: Practical Handling Guidelines
All wet-laid fiber papers incorporate 6.0–8.5% organic latex binder to impart handling flexibility, tensile strength, and rollability. Understanding how this binder reacts under heat prevents operational surprises:
Ambient to 180°C: The paper maintains its full mechanical strength and flexibility.
200°C to 450°C (Burnout Zone): The organic latex binder volatilizes. Moderate smoke and odor will be generated during this initial heat-up. In enclosed production halls, exhaust ventilation should run at maximum capacity.
Above 500°C: The binder is completely eliminated, leaving a pure inorganic, non-combustible fiber structure.
Critical Installation Rule: Once the binder burns off, the paper loses its room-temperature tensile strength. It becomes fragile if handled uncompressed. Therefore, always install and bolt gaskets under mechanical compression between flanges before initial heating. Under compression, the ceramic fiber matrix maintains its thermal seal indefinitely.
For cleanroom, laboratory, or domestic appliance applications where zero smoke is mandatory, we supply a specialized pre-fired binder-free soluble paper line.
Export Dimensions, Packaging & Sourcing Guidelines
As a dedicated soluble fiber paper supplier, tprefractory ships all export rolls in moisture-protected packaging built for multi-week container shipping.
Standard Roll Configurations
0.5 mm Thickness: Widths 610 / 1000 / 1220 mm | Roll Length: 60 m (36.6 to 73.2 m²)
1.0 mm Thickness: Widths 610 / 1000 / 1220 mm | Roll Length: 40 m (24.4 to 48.8 m²)
2.0 mm Thickness: Widths 610 / 1000 / 1220 mm | Roll Length: 20 m (12.2 to 24.4 m²)
3.0 mm Thickness: Widths 610 / 1000 / 1220 mm | Roll Length: 15 m (9.15 to 18.3 m²)
5.0 mm Thickness: Widths 610 / 1000 / 1220 mm | Roll Length: 10 m (6.10 to 12.2 m²)
6.0 mm Thickness: Widths 610 / 1000 / 1220 mm | Roll Length: 8 m (4.88 to 9.76 m²)
10.0 mm Thickness: Widths 610 / 1000 mm | Roll Length: 5 m (3.05 to 5.0 m²)
Custom roll slitting is available down to 25 mm strip width for pipe joints and coil insulation.
Commercial Terms & Quality Assurance
Minimum Order Quantity (MOQ): 20 standard stock rolls; 1,000 pieces for custom die-cut gaskets.
Factory Lead Time: Standard stock thicknesses dispatch within 5–7 working days; custom die-cut gaskets take 10–14 working days.
Quality Verification: Every export lot is tested for bulk density, loss on ignition (LOI), and tensile strength. Full Mill Test Certificates (MTC) and European Note Q compliance documents accompany shipping manifests.
Logistics: FOB Qingdao Port or CIF delivery worldwide. Consolidated container shipments with firebricks, castables, and ceramic fiber blankets are supported to optimize freight costs.
Technical Support & RFQ Requests
To request technical data sheets (TDS), European Note Q compliance certification, or a quotation for master rolls and custom gaskets:
Email: inquiry@topower.tech (Direct engineer response within 4 hours)
Details Needed for Gasket Quotes: Operating temperature, flange bolt pressure, and 2D drawings (PDF/DWG) with dimensions and tolerances.
Sample Service: Free A4 sample swatches or 5-meter test rolls are available for lab validation-client covers express courier costs.
