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High Silica Needled Mat

High Silica Needled Mat (HSNM) is a premium fibrous insulation material crafted from high-purity silica fiberglass fibers (typically 95-99% SiO₂) through a mechanical needling process. The manufacturing process starts with precision carding to align and open the chopped strands, followed by feeding them into a needle loom. Here, the fibers are randomly distributed, interlocked, and mechanically punched (needled) into a dense, cohesive mat, no binders or adhesives are used, preserving its pure fibrous structure and high-temperature performance.

Unlike woven fabrics, needled mats have a three-dimensional, felt-like structure created by entangling fibers with barbed needles, resulting in a cohesive mat with significant thickness, loft, and resilience. This manufacturing method provides uniform fiber distribution in all directions within the plane, creating an isotropic material with excellent thermal and mechanical properties.

Identification:

What Makes High Silica Needle Mat Stand Out? (What are the advantages of high silica needled mat?)

1.Superior multi-functional insulation: Excels at thermal, acoustic, and electrical insulation—blocks heat transfer, dampens noise, and prevents electrical conduction.

2.Strong vibration resistance: The interlocked fibrous structure maintains shape and performance even under mechanical vibration or thermal cycling.

3.Ultra-low impurity content: Non-alkaline (≤0.01%) with minimal chlorides and fluorides, avoiding corrosion to equipment or compatibility issues with other materials.

4.User and environment-friendly: Skin-friendly (no irritating fibers) and non-hazardous to health—safe for handling during installation and use.

5.Chemical inertness: Resists most acids, alkalis, and organic solvents, making it suitable for harsh chemical environments.

6.Dimensional stability: Low thermal shrinkage (even at 980°C) ensures it won’t deform or lose functionality over time.

Technical Data:

Note: The "PS" suffix indicates preshrunk treatment, which reduces thermal shrinkage for applications requiring tight dimensional control. It is Customizable according to thickness, width and density. Please consult with us.

Application:

1. Filtration material: high temperature gas and liquid metallurgy industry

2. Thermal resistance material: aircraft and aerospace industries, and other electro- and chemical industries industry

3. Acoustic material: thermal and acoustic insulation applications in automotive and exhaust systems.

Where Can high silica needled mat Be Used? (What Applications is high silica needled mat used for?)

Industrial Furnaces & Heat Treatment:

-Backup Insulation: Behind ceramic fiber modules or brickwork

-Expansion Joint Filler: In brick or castable refractory linings

-Door Seals & Gaskets: For furnace and oven doors

-Baffles & Curtains: To separate furnace zones

-Pipe & Duct Insulation: For high-temperature piping systems

Power Generation:

-Boiler Insulation: Around headers, drums, and penetrations

-Turbine Insulation: For gas turbine enclosures

-Heat Recovery Steam Generators (HRSG): Insulation for casings

-Flue & Duct Insulation: In high-temperature exhaust systems

-Nuclear Applications: Insulation in reactor ancillary systems

Petrochemical & Refining:

-Fired Heater Insulation: In reformer furnaces, crackers

-Pipe Insulation: For high-temperature process piping

-Vessel Insulation: For reactors, columns, and separators

-Expansion Joints: In ducting and piping systems

-Personnel Protection: Heat shields and barriers

Aerospace & Defense:

-Thermal Protection Systems: Backup insulation for TPS

-Rocket Motor Insulation: In nozzle and casing applications

-Firewalls & Barriers: In aircraft and spacecraft

-Test Facility Insulation: For engine test stands and facilities

-Re-entry Vehicle Insulation: Thermal protection components

Automotive & Transportation:

-Exhaust System Insulation: Around manifolds, turbochargers

-Fire Barriers: In engine compartments

-Catalytic Converter Insulation: For temperature maintenance

-Brake Insulation: Heat shields near braking systems

-High-Temperature Gaskets: For exhaust components

Metal Processing:

-Ladle & Tundish Insulation: In steelmaking operations

-Furnace Linings: In aluminum melting and holding furnaces

-Soak Pit Covers: For ingot heating facilities

-Annealing Covers: For heat treatment operations

-Molten Metal Splash Protection: Safety barriers

Specialty Applications:

-Fire Protection: In fire doors, dampers, and protective curtains

-Laboratory Equipment: Insulation for ovens, furnaces, and analyzers

-Electrical Insulation: For high-temperature busbars and transformers

-Composite Tooling: As insulation in composite curing tools

Glass Manufacturing: In lehrs, annealers, and forming equipment

How to store and handle high silica needled mat? 

To maintain optimal performance, store HSNM in a cool, tidy, and dry environment:

-Temperature: 15°C–35°C

-Relative Humidity: 35%–65%

-Keep the original packaging intact until ready for production—prevents moisture absorption, dust contamination, or fiber damage.

-Shelf Life: No fixed expiration when stored properly, but retest the material 36 months after the production date to confirm thermal, mechanical, and chemical properties remain up to standard.

FAQ

Question 1: How does silica needled mat compare to folded or stacked module systems?

A: High silica needled mats are more flexible and conformable than rigid modules. They're better for irregular surfaces and complex geometries. Modules offer faster installation for large flat surfaces and better resistance to high-velocity gases. Needled mats typically have lower installed cost for complex shapes.

Question 2: Can needled mat be compressed during installation?

A: Yes, and it should be. Installation at 10-25% compression:

-Improves thermal performance (reduces convection)

-Increases durability and resistance to gas erosion

-Provides better support and stability

-Recovery from compression is typically 85-95%

-Don't exceed 50% compression as recovery decreases

Question 3: What's the difference between organic and inorganic binders used in silica needled mat?

A:

-Organic Binders (acrylic, latex): Provide excellent green strength for handling, burn off cleanly at 300-400°C, leaving pure silica fibers. Best for applications where high handling strength is needed before use.

-Inorganic Binders (colloidal silica, alumina): Provide permanent bonding that survives to high temperatures, but may reduce temperature limit slightly and increase thermal conductivity. Used where mechanical integrity must be maintained at temperature.

Question 4: How do I calculate the required thickness of silica needled mat for my application?

A: Thickness depends on:

1.Hot face temperature

2.Cold face temperature limit

3.Heat flux requirements

4.Material thermal conductivity (function of temperature and density)

General guidelines:

-600°C hot face: 25-50mm (1-2")

-800°C hot face: 50-75mm (2-3")

-1000°C hot face: 75-100mm (3-4")

Question 5: Can high silica needled mat be used in vertical applications without sagging?

A: Yes, with proper consideration:

-Higher density mats (>128 kg/m³) have better sag resistance

-Use inorganic binders for permanent vertical installations

-Mechanical fastening at closer intervals (150-300mm centers)

-Consider wire mesh retainers for tall vertical installations

-For high temperatures, design for some shrinkage/settling

Question 6: How does the density of high silica needled mat affect performance?

A:

-Lower Density (64-96 kg/m³): Better insulation (more entrapped air), lighter weight, lower cost per volume, less durable

-Higher Density (128-192 kg/m³): Better durability, better compression resistance, better handling strength, slightly higher thermal conductivity

-Select based on application: insulation-only = lower density; handling/durability needed = higher density

Question 7: How do I join silica needled mat pieces together?

A: Several methods:

1.Butt Joints: Cut edges square and push together tightly

2.Lapped Joints: Overlap 25-50mm, compress at overlap

3.Adhesive Joints: High-temperature ceramic adhesive

4.Mechanical Joints: Overlap and secure with fasteners

5.Stitching: High-temperature thread or wire

For best results, stagger joints in multi-layer installations

Question 8: How is high silica needled mat installed?

A: It’s easy to cut with standard tools (scissors, utility knives) and can be installed via mechanical fastening (clips, straps) or laminated with other materials. For high-vibration applications, ensure secure fastening to prevent fiber displacement.