Brief Description:High density rock wool slab is customized for external thin-coat render systems. Featuring A1 non-combustible grade, low thermal conductivity, crack resistance and water repellency, this eco-friendly insulation suits high-rise buildings, public constructions and exterior wall energy-saving renovation projects.

Haochen high‑density rock wool slab for external thin‑coat render systems is manufactured in compliance with national specifications for rock‑wool products for external thermal‑insulation composite systems. It is a dedicated fire‑resistant thermal‑insulation slab engineered specifically for external thin‑coat render insulation assemblies and serves as the core material for thin‑coat render external wall projects.

Manufactured from premium natural volcanic rock including high‑purity basalt and diabase, raw materials are melted at approximately 1500 °C, spun into inorganic mineral fibres at high‑speed centrifugal drawing. Environment‑friendly water‑repellent additives are incorporated before three‑dimensional uniform fibre laying, high‑pressure curing and precision cutting. The finished slab delivers high‑performance external‑wall thermal insulation optimised for thin‑coat render working conditions.

Key Product Benefits

1. Class A1 Non‑Combustible, Compliant with Mandatory Building Fire‑Safety Codes

This rock wool slab for thin‑coat render adopts fully inorganic mineral‑fibre composition containing no combustible components, delivering outstanding fire‑resistant performance. It will not ignite under direct flame, produces no molten drips and releases no toxic smoke. It retains stable dimensions without shrinkage or deformation under high‑temperature exposure, effectively restraining vertical flame spread and safeguarding fire safety for external thermal‑insulation assemblies.

Fully satisfying stringent external‑wall fire‑safety requirements for high‑rise residential buildings over 100 m and large public buildings above 50 m. The slab may be laid across full wall surfaces or installed as dedicated floor fire‑stop barriers. It facilitates smooth fire‑safety inspection and energy‑saving acceptance tests, eliminating fire hazards originating from external‑wall insulation layers.

2. Ultra‑Low Thermal Conductivity for Sustained Building Energy Reduction

The slab’s dense porous three‑dimensional fibre matrix entraps stationary air. Its thermal conductivity is ≤ 0.040 W/(m·K), delivering consistent, long‑term thermal‑insulation performance and maximising energy‑saving benefits for external‑wall rock wool.

It retains indoor heat in winter and blocks incoming outdoor heat in summer, substantially cutting energy consumption for heating and air‑conditioning plant and helping buildings achieve the 65 % energy‑saving standard. Indoor temperatures remain comfortable all year‑round with zero degradation of insulating performance over service life.

3. High‑Density Robust Construction, Anti‑Cracking and Anti‑Delamination

Haochen rock wool slab for thin‑coat render systems features special orientated‑fibre lay‑up technology for external wall use. Standard densities cover 140‑160 kg/m³. Perpendicular‑to‑face tensile strength, compressive strength, wind‑load resistance and impact resistance satisfy special performance criteria for thin‑coat render installation.

This external‑wall insulation slab withstands harsh outdoor conditions including freeze‑thaw cycles, intense solar radiation, wind‑rain exposure and large diurnal temperature swings. It resists hollowing, cracking, shrinkage and deformation through long‑term service. Excellent compatibility with bonding mortar and reinforcing render mesh eliminates the common failure modes of external‑wall insulation delamination and cracking. Service‑life of the thin‑coat render insulation assembly matches the design life of the building main structure.

4. High Water‑Repellency & Vapour Permeability – Moisture‑Resistant, Mould‑Inhibiting Wall Performance

Each slab receives integral hydrophobic modification during production with water‑repellent rate ≥ 98 %. It resists water ingress under rain exposure and preserves full insulating performance even in persistently damp conditions.

This rock wool slab also retains good water‑vapour permeability, allowing residual moisture trapped within wall assemblies to escape freely. It effectively prevents internal‑wall dampness, surface mould growth and plaster peeling, enabling reliable installation and long‑term service across all climate zones for thin‑coat render external‑insulation projects.

5. Acoustic Absorption & Eco‑Friendly Formulation for Civil‑Use Buildings

The open porous fibre structure efficiently attenuates traffic‑borne and ambient environmental noise and restricts noise transmission into occupied spaces for prominent indoor sound‑reduction performance.

No harmful additives such as formaldehyde or benzene are introduced throughout manufacturing; the material is odour‑free and non‑polluting and qualifies as a national‑standard green building product. This external‑wall insulation rock wool slab is widely used for thin‑coat render insulation works in schools, hospitals, residential blocks, office premises and other civil buildings demanding strict safety and environmental standards.

Technical Specifications

 Reaction‑to‑Fire Classification: Class A1 Non‑Combustible (GB 8624‑2018)

 Thermal Conductivity: ≤ 0.040 W/(m·K)

 Standard Densities: 140 kg/m³, 160 kg/m³ (custom densities available)

 Standard Dimensions: 1200 × 600 mm

 Standard Thicknesses: 30 mm, 50 mm, 60 mm, 80 mm, 100 mm (project‑specific custom thicknesses supported)

 Water‑repellent Rate: ≥ 98 %

Application Scope

1. New‑build thin‑coat render external‑wall insulation projects for high‑rise residences, townhouses and villas using Haochen high‑density rock wool slab for thin‑coat render systems.

2. External‑wall fire‑resistant thermal‑insulation projects for office complexes, shopping centres, hospitals, schools and government administrative buildings, utilising thin‑coat‑render rock‑wool slab as primary external‑insulation material.

3. External‑wall fire‑resistant thermal‑insulation assemblies for industrial workshops, warehouses and prefabricated buildings, compatible with thin‑coat‑render rock‑wool slab.

4. External‑wall energy‑saving refurbishment, insulation retrofitting and renovation projects for ageing residential blocks, where thin‑coat‑render rock‑wool slab is a frequently‑specified material.

5. Supplementary construction for floor fire‑stop barriers, curtain‑wall liner insulation and fire‑protection infill, deployable together with thin‑coat‑render rock‑wool slab.

Installation Advantages & Brand Credentials

Haochen Thermal Insulation has many years of experience within thermal‑insulation building‑materials sector. Our high‑density rock wool slab for external thin‑coat render systems features flat geometry, uniform thickness, compact fibres, clean cutting characteristics and minimal fibre shedding. It is fully compatible with complete standardised thin‑coat‑render installation workflows. The rock‑wool slab offers simple installation and high system compatibility to boost site productivity, shorten construction cycles and reduce labour expenditure.

Haochen thin‑coat‑render rock‑wool slabs comply fully with performance specifications and deliver consistent quality. Physical, fire‑resistance and thermal‑insulation properties maintain good batch‑to‑batch consistency for dependable performance. Committed to rigorous quality control for external‑wall insulation materials, our company serves main contractors and thermal‑insulation installers, focusing on material supply for thin‑coat render external‑insulation projects. Operating with integrity and reliable contractual performance, we are a preferred long‑term‑partner supplier of fire‑resistant external‑wall insulation materials for engineering‑sector clients.