Ceramic Fiber Modules & Precast Folded Blocks

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Introduction

Ceramic fiber modules — also called folded blocks or precast blocks — are prefabricated furnace lining units made by folding or layering ceramic fiber blanket into a dense, self-supporting package and securing it with a stainless or heat-resistant steel anchor system embedded in the cold face. The module installs by stud-welding the anchor to the furnace shell, making large furnace linings a straightforward bolt-in operation rather than a skilled-craftsman project.

Nengcheng's NC ceramic fiber modules are manufactured on dedicated pressing equipment that ensures precise outer dimensions and consistent compressed density across the hot face. The standard M-type anchor uses high-quality heat-resistant steel forgings welded to a butterfly retaining plate, distributing load across a larger footprint and maintaining grip even when the cold-face steel softens at elevated shell temperatures.

Composite precast blocks extend the concept further: these units combine an alumina silicate or mullite fiber core with a castable or board hot-face cap, allowing the module system to be used in applications where direct flame impingement, high gas velocity, or abrasive fly ash would otherwise erode a plain blanket face.

Specification

Parameter	Value
Fiber Grade	1260 °C / 1350 °C / 1430 °C / 1600 °C (PMF)
Module Dimensions (standard)	300 × 300 × 200 mm; 300 × 300 × 250 mm; 300 × 300 × 300 mm
Hot-Face Density (compressed)	200–280 kg/m³
Anchor Material	310S stainless steel (standard); Inconel 601 (high-temp option)
Anchor Type	M-type with butterfly retaining plate
Thermal Conductivity @ 600 °C	0.10 – 0.18 W/(m·K)
Installation Method	Stud-weld anchor to shell plate
Composite Block Hot Face Options	Dense castable cap, ceramic fiber board cap, SiC face
Custom Module Size	Available to drawing
Color	White (fiber face)

Application

Continuous furnace side walls and roofs: modules tile the entire interior with staggered joints, eliminating the through-gaps that cause heat losses in blanket systems
Tunnel kiln crowns: prefabricated module systems allow full crown relining in a single shift, minimizing kiln downtime
Car-bottom furnaces: modules on side walls withstand mechanical impact from kiln cars better than blanket systems
Petrochemical process heaters: composite modules with abrasion-resistant hot faces used in fired heater radiant boxes
Steel reheat furnaces: high-temperature PMF modules for the top zones of pusher and walking-beam furnaces
Waste-heat boilers: module linings in flue gas ducts where turbulent gas flow would erode plain blanket faces

Advantage

Fast installation: a 50 m² furnace wall can be lined by two workers in one day, versus three days for a blanket system with the same insulating value
Self-compensating joint system: modules expand on heat-up, closing all installation joints and eliminating the hot spots caused by gaps between blanket layers
Modular replaceability: individual damaged modules can be swapped out without disturbing adjacent lining — ideal for furnaces with localized hot-spot problems
Higher hot-face density: compressed fiber face at 200–280 kg/m³ resists gas-flow erosion and mechanical abrasion better than loose blanket
Anchor system integrity: M-type anchor with butterfly plate is designed to prevent pull-out even if the module face erodes over time
Composite options: castable or board-capped modules extend module technology into high-velocity and flame-impingement zones

Core Features

Precision pressing to dimensional tolerance ± 3 mm on all faces for consistent joint widths
Staggered joint design on installation drawings provided for each project
M-type 310S stainless anchor welded to stamped butterfly plate — enlarged bearing area prevents pull-out
Two embedded round fixing links in each module for belt-and-suspenders retention
Composite variants: ceramic fiber board cap, dense castable cap, or SiC face available
PMF module grade rated to 1600 °C for extreme-temperature furnace zones
Installation guide and stud-welding specification provided with each shipment

What is the advantage of modules over a multi-layer blanket system?
Modules offer three key advantages over blanket: faster installation (bolt-in vs layering and pinning), self-sealing joints that close on heat-up, and a denser hot face that resists erosion. For large furnaces where downtime cost is significant, the installation speed advantage alone often justifies the higher material cost.

How are ceramic fiber modules attached to a steel furnace shell?
The standard method is stud-welding: a ceramic-coated stud is arc-welded to the furnace shell plate, the module anchor slides over the stud, and a nut locks the module in place. Nengcheng provides a module layout drawing and stud-welding pattern for each project. No drilling or heavy tools required — a standard stud welder and torque wrench are sufficient.

Can modules be used on furnace floors?
Standard modules are not recommended for floor applications because foot traffic and load from kiln cars crush the fiber quickly. For floor insulation, dense ceramic fiber board, castable, or a board-topped module system with adequate load distribution is more appropriate.

What happens to the joints between modules when the furnace heats up?
Module hot faces are intentionally compressed during manufacture. On heat-up, thermal expansion of the fiber relaxes this compression and closes all installation gaps. This self-sealing behavior is one of the key performance features of module systems — it eliminates the cold-state gaps visible after installation.

Do you offer project-specific module layout drawings?
Yes. For orders covering a full furnace lining, Nengcheng's technical team will prepare a module layout drawing showing stud positions, module orientation, corner details, and any special shapes required. This service is included for orders above a defined square-meter threshold — contact us for details.

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 Ceramic Fiber Modules & Precast Folded Blocks 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 Ceramic Fiber Modules & Precast Folded Blocks 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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Ceramic Fiber Modules & Precast Folded Blocks

Introduction