A1-Class Fireproof Insulation Rock Wool Blanket

Product Overview

The A1-class fireproof rock wool blanket is a high-performance inorganic fiber insulation roll made from premium natural basalt and dolomite. These minerals are melted at temperatures exceeding 1450°C and processed using advanced centrifugal fiber-forming technology combined with a unique lamination reinforcement process.

This process ensures long, resilient fibers and a uniform internal structure, giving the blanket excellent flexibility and making it easy to cut and install.

As a Class A1 non-combustible material, rock wool blankets have a melting point above 1000°C. During a fire, they do not produce molten droplets or toxic gases, effectively preventing flame spread and providing a reliable fire barrier for buildings and industrial equipment.

The interwoven fiber structure forms countless micro air pockets, giving the material excellent thermal insulation performance, significantly reducing industrial heat loss or building energy consumption. The porous fiber structure also provides strong sound absorption capabilities, reducing equipment noise and indoor reverberation to create a quieter environment.

Rock wool blankets are widely used in curtain wall insulation, steel structure fire protection, industrial boiler and pipeline insulation, and ship cabin fireproofing and noise reduction, making them an ideal solution for both safety and energy efficiency.

Product Features

Excellent Thermal Insulation

Rock wool blankets have a very low thermal conductivity, effectively blocking heat transfer and significantly reducing energy loss.

Outstanding Fire Resistance

Made from non-combustible A1-grade materials, rock wool blankets effectively delay fire spread and improve the fire safety level of buildings and equipment.

Effective Sound Absorption

The internal porous fiber structure absorbs sound waves efficiently, making the product suitable for building walls, machinery, and industrial equipment noise control.

Water Repellency and Moisture Resistance

With added hydrophobic agents, the blanket resists water penetration and maintains long-term insulation performance and stability.

Chemical Stability and Corrosion Resistance

The material is stable against most chemicals and does not easily corrode metal equipment, making it suitable for chemical and industrial environments.

Structural Stability and Vibration Resistance

Long elastic fibers provide structural stability under temperature changes and vibration, preventing deformation and ensuring a long service life.

Easy Installation

Lightweight and flexible, the blanket is easy to cut and can conform closely to irregular surfaces, improving installation efficiency.

Applications

Construction Industry

Roof Insulation
Used as thermal insulation layers in sloped roofs, installed above purlins or within ceiling structures.

Wall Insulation
Applied in exterior wall insulation systems, curtain wall insulation, and interior wall sound insulation.

Partitions and Floors
Used as filling material in steel structure buildings and office partitions for thermal insulation, soundproofing, and fire protection.

Industrial Applications

Pipeline Insulation
Widely used for thermal insulation and condensation prevention in heating pipelines and petrochemical pipelines.

Equipment Insulation
Suitable for boilers, storage tanks, reactors, and flue systems.

Shipbuilding
Used in ship bulkheads and decks for fire protection, insulation, and soundproofing.

Other Fields

Agriculture
Used as insulation covering for greenhouse cultivation.

Transportation
Applied in high-speed rail and subway vehicles for fireproofing and acoustic insulation.

Technical Parameters

Rock Wool Blanket Installation Guide

This guide applies to rock wool insulation systems used in building walls, industrial equipment, and pipelines, ensuring proper construction quality, insulation performance, and operational safety. 1. Pre-Installation Preparation

Material Inspection

Verify material certificates, ensuring density, thickness, dimensions, and fire rating meet design requirements.

Check packaging integrity; materials should be dry, undamaged, and uncontaminated.

Auxiliary Materials

Prepare compatible accessories such as:

Insulation anchors

Adhesives

Rendering mortar

Alkali-resistant fiberglass mesh

Metal corner protectors

Substrate Preparation

Surfaces must be clean, solid, and level, free from oil, release agents, and loose particles.

Surface flatness deviation should generally be ≤4 mm within 2 m.

Ensure the substrate is dry and dust-free.

Pre-treat special areas such as door/window openings, pipe penetrations, and expansion joints with waterproofing and sealing.

Tools and Safety

Tools include:

Tape measure

Utility knife or hand saw

Electric mixer

Trowel

Hammer drill

Safety requirements:

Certified scaffolding or working platforms

Protective gloves, masks, goggles, and long-sleeved clothing

2. Installation Process

Step 1 – Layout and Adhesive Application

Mark horizontal and vertical guide lines.

Apply adhesive using methods such as:

Strip method: adhesive strips about 50 mm wide.

Frame-dot method: adhesive along edges with central bonding points.

Adhesive coverage should be at least 40% of the surface area.

Step 2 – Installing the Rock Wool Blanket

Installation direction

Install from bottom to top horizontally.

Start from internal corners.

Stagger vertical joints by at least one-third of the panel length.

Cutting

Cut precisely around doors, windows, and edges using special knives.

Fixing methods

Adhesive fixing (building walls)
Press the blanket firmly against the substrate and level it with a straight edge.

Mechanical anchoring
After adhesive curing (usually 24 hours):

Drill holes through insulation and substrate

Insert anchors and press discs firmly against the surface

Use 6–8 anchors per square meter, more at corners and ground floors

Binding method (industrial equipment and pipes)
Secure with galvanized wire or stainless steel bands at designed intervals.
Multi-layer insulation should have staggered joints.

Step 3 – Joint Treatment

Joints must be tight, with gaps ≤2 mm.

Larger gaps should be filled with rock wool strips or insulation foam.

Step 4 – Rendering Layer (Exterior Wall System)

Apply the first rendering layer (2–3 mm thick).

Embed alkali-resistant fiberglass mesh:

Press from center outward

Ensure full embedding without wrinkles

Overlap mesh by ≥100 mm.

Apply second rendering layer (1–2 mm) after partial curing.

Reinforce door/window corners and stress points with additional mesh.

Key Construction Precautions

Moisture Protection

Rock wool blankets must be protected from rain and moisture during storage and installation.

Safety Requirements

Workers must use safety harnesses during high-altitude work.

Open flames are strictly prohibited on site.

Health Protection

Clean fiber debris promptly and wash exposed skin after installation.

Quality Inspection

Regularly check flatness and vertical alignment during installation.

Common Problems and Solutions

Problem: Poor joint sealing causing thermal bridges
Solution: Use staggered joints and fill gaps with rock wool strips.

Problem: Cracks in rendering layer
Solution: Ensure proper mortar thickness and correct mesh installation.

Problem: Loose anchors
Solution: Drill into solid substrates and use anchors of sufficient length.

FAQ

Q1: What is the main difference between rock wool blankets and glass wool?
A1: Rock wool blankets offer higher temperature resistance (up to about 650°C) and stronger mechanical strength, making them suitable for high-temperature environments. Glass wool has finer fibers and slightly better mid-to-low frequency sound absorption but generally requires moisture protection.

Q2: Will rock wool blankets settle or deform over time?
A2: No. The three-dimensional fiber structure ensures stability. Testing shows less than 3% compression after 20 years, which is far below the national standard limit of 10%.

Q3: How should rock wool blankets be used in humid environments?
A3: Choose hydrophobic rock wool blankets with water repellency ≥98%, and add a vapor barrier layer in highly humid conditions.

Q4: Do rock wool fibers irritate the skin?
A4: The surface treatment reduces fiber dispersion. Standard protective clothing and gloves are sufficient. If fibers contact the skin, simply rinse with clean water.

Q5: What fire rating does rock wool blanket have?
A5: Rock wool blankets are Class A1 non-combustible materials made from natural basalt. They do not propagate flames or release toxic smoke and are widely used in firewalls, fire compartments, stairwell protection areas, and pipe shafts to improve overall building fire safety.

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