Comprehensive analysis of the definition of rock wool insulation board, production process and thermal insulation principle. Detailed explanation of A1 fire performance and environmental advantages. Explore the scientific nature of this core material for building insulation!
I. Definition of Rockwool Insulation Board
Rock wool insulation board is a high-performance building insulation material made of natural basalt as the main raw material, which is made of inorganic fibre through centrifugal technology after high temperature melting, then three-dimensional cotton spreading by pendulum, curing and forming. According to the Chinese national standard GB/T 25975-2018, it is defined as:
‘A board-like thermal insulation product made from basalt and other ores by high-temperature melting and fibrillation, with the addition of an appropriate amount of binder’
Core features:
Fire rating A1: non-combustible material
Inorganic environmentally friendly material: does not contain CFCs, HCFCs and other harmful substances
II. The science of raw materials: the metamorphosis of basalt journey
1. Core Raw Material Composition
|
Raw Material |
Percentage |
Role |
|
Basalt |
≥80% |
Provides fibre skeleton and high temperature resistance |
|
Slag |
15-20% |
Reduces the melting temperature |
|
Hydrophobic agent |
0.5-1% |
Reduces the water absorption rate |
Third, the principle of thermal insulation revealed: how fibres block heat transfer
1. Triple thermal resistance mechanism
Air imprisonment effect: the fibre network locks > 90% of the static air
Heat conduction blocking: fibre direction perpendicular to the heat flow
2. Comparison with mainstream materials
|
Characteristics |
Rockwool Board |
Polystyrene Panel (EPS) |
Polyurethane (PU) |
|
Thermal Conductivity |
0.036-0.042 |
0.038-0.041 |
0.022-0.028 |
|
Fire Rating |
Class A1 non-combustible |
Class B2 combustible |
Class B1 flame-retardant
|
|
Moisture Permeability Resistance |
μ=1 |
μ=20-100 |
μ=60-100
|
Understand the basalt nature of rock wool insulation board and fibre insulation principle, accurate judgement of product quality.
The next issue will detail the ‘7 fatal misunderstandings of rock wool board purchase’, click contact us to get the industry to avoid the pit guide!