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Aluminum Silicate Refractory Fiber Blankets & Felts

-- Steady & Reliable Manufacturer --

Introduction

Aluminum silicate refractory fiber blankets and felts are the workhorses of industrial thermal insulation. Produced by melting a carefully proportioned mix of alumina and silica raw materials in an electric furnace, then spinning or blowing the melt into amorphous glass-state fibers, these products cover the 900–1430 °C service range that includes the majority of industrial furnace applications worldwide.

Nengcheng produces Al-Si fiber blankets in four standard grades: standard (1260 °C), high-alumina (1350 °C), ultra-high-alumina (1430 °C), and zirconia-enhanced (1500 °C). Blankets are produced by a continuous needling process that bonds the fiber layers without organic binders, while felts are compressed and resin-bonded for added rigidity and machinability.

These products represent the highest-volume segment of the refractory fiber market, and for good reason: they are lightweight, easy to install, thermally efficient, and significantly cheaper than dense refractory alternatives. A 150 mm blanket lining can replace 230 mm of insulating firebrick with lower thermal mass and faster heat-up times — a combination that directly reduces energy bills in intermittent kilns.

Specification

ParameterValue
Temperature Grades1260 °C / 1350 °C / 1430 °C / 1500 °C (Zirconia)
Bulk Density96 kg/m³, 128 kg/m³, 160 kg/m³, 192 kg/m³
Blanket Roll Size7200 × 600 mm (standard), custom lengths
Thickness (blanket)13 mm, 25 mm, 38 mm, 50 mm
Felt Thickness6 mm – 25 mm
Thermal Conductivity @ 600 °C0.10 – 0.16 W/(m·K)
Al₂O₃ Content44–46% (std) / 52–54% (high-Al) / 62–65% (ultra-high-Al)
Linear Shrinkage @ rated temp / 24 h≤ 2.5%
Tensile Strength (blanket, 128 kg/m³)≥ 35 kPa
Shot Content (> 0.212 mm)≤ 10%

Application

  • Industrial furnace backup insulation: secondary and tertiary lining layers behind ceramic fiber boards or castable hot faces
  • Kiln car decking: lightweight lining on tunnel kiln cars, reducing thermal mass and enabling faster firing cycles
  • Pipe & vessel wrapping: blanket wrapped around hot process pipes, steam headers, and reactor vessels for energy conservation
  • Expansion joint packing: compressible blanket fills thermal expansion gaps between rigid refractory sections
  • Fire and smoke seals: blanket packed into structural penetrations in industrial buildings for passive fire protection
  • Boiler insulation: wall and door insulation on fire-tube and water-tube boilers in power and process industries
  • Ceramic kiln linings: full blanket lining systems in shuttle kilns firing sanitaryware, technical ceramics, and tableware

Advantage

  • Lowest installed cost per °C of insulation: blanket systems require far less material volume than dense refractories to achieve the same thermal resistance
  • Fast installation: large-format rolls can be cut and pinned by two workers without specialized tools, cutting lining downtime significantly
  • No curing required: unlike castables, blanket linings are immediately ready for heat-up after installation
  • High thermal shock resistance: flexible fiber structure absorbs differential expansion stress without cracking
  • Multiple density options: 96–192 kg/m³ range allows optimization of insulation depth versus structural load for each application
  • Low heat storage: specific heat × density product is far lower than castables, meaning the lining itself absorbs less energy during heat-up

Core Features

  • Continuous needling production line for consistent thickness tolerance ± 1.5 mm across full roll length
  • Four temperature grades from a single manufacturing platform — consistent quality language across the range
  • Zirconia-enhanced grade (1500 °C) uses ZrO₂-stabilized fiber for maximum glass-phase stability
  • Blanket rolls available with aluminum foil facing for moisture protection during storage and installation
  • Felt products available in die-cut shapes for sealing and gasket applications
  • Compliant with EUCEB bio-persistent fiber classification guidelines for applicable low-temperature grades
  • What density blanket should I use for a 1200 °C electric kiln?
  • For a standard 1200 °C electric kiln, 128 kg/m³ blanket in the 1260 °C grade is the most common choice. It provides good stiffness for wall lining, adequate mechanical strength for the roof, and a comfortable safety margin below the classification temperature. If the kiln regularly operates at 1200 °C rather than just occasionally, consider the 1350 °C grade to reduce long-term shrinkage.
  • How do I prevent blanket lining from sagging on a furnace roof?
  • Roof blanket is typically installed using ceramic anchor pins spot-welded to the steel shell at 150–200 mm centres, with speed clips holding the blanket layers against the shell. Modules folded from blanket provide a more mechanically stable alternative for roofs larger than about 1.2 m span, as the folded geometry provides inherent self-support.
  • What is the difference between blanket and felt?
  • Both are made from the same aluminum silicate fiber, but blanket uses needling (mechanical interlocking of fibers) while felt uses a resin binder for cohesion. Blanket is softer and more compressible — better for lining and wrapping applications. Felt is stiffer and easier to machine — better for gaskets, seals, and die-cut shapes.
  • Can I reuse blanket lining after a furnace rebuild?
  • Blanket that has not been exposed above its rated temperature and shows no discoloration, shrinkage cracks, or contamination can sometimes be reused, particularly from backup layers that remained cool. However, blanket that has been on the hot face for more than one campaign is typically replaced during rebuilds, as fiber shot content and thermal shrinkage increase with service time.
  • Is aluminum silicate fiber hazardous to health?
  • Refractory ceramic fibers are classified as a possible carcinogen (IARC Group 2B) based on rodent studies. Practical risk during installation is managed by wearing FFP2/N95 masks, gloves, and long sleeves, and working in ventilated conditions. Some low-biopersistence (LBP) grades are available for applications where fiber inhalation risk is a regulatory concern.
Zhejiang Nengcheng Crystal Fiber Co., Ltd.
Zhejiang Nengcheng Crystal Fiber Co., Ltd.
Zhejiang Nengcheng Crystal Fiber Co., Ltd. was established in 2015. It is a professional enterprise that develops and produces ultra lightweight energy-saving high-temperature materials, and sells experimental electric furnaces, industrial electric furnaces, and non-standard customized electric furnaces. China Aluminum Silicate Refractory Fiber Blankets & Felts Manufacturers. The company adheres to the principle of "survival through quality, development through reputation" and upholds the business philosophy of "practicality, integrity, and efficiency". We are committed to providing comprehensive and high-quality equipment solutions for customers in industries such as ceramics, metallurgy, electronics, glass, and chemical engineering. We also provide services such as powder roasting, ceramic sintering, and high-temperature experiments to universities, research institutes, and industrial and mining enterprises. wholesale Aluminum Silicate Refractory Fiber Blankets & Felts Suppliers. At the same time, we are also striving to promote the strategic development of Nengcheng's lightweight, energy-saving, and environmentally friendly high-temperature alumina fiber in the field of new furnaces, and strive to become an internationally leading advanced high-temperature equipment industry service provider.

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