Applicable National Standard: GB/T 17794-2021 Flexible Foam Rubber and Plastic Thermal Insulation Products
Structure: Inner NBR/PVC closed-cell elastomeric foam tube shell + outer composite aluminum foil protective layer; slit self-adhesive type and integral closed type are optional
1. Standard Dimensions
Inner Diameter (common sizes for steel pipes / PPR pipes, unit: mm)
6, 9, 13, 16, 19, 22, 27, 32, 34, 43, 48, 57, 60, 76, 89, 108, 114, 133, 159, 168, 219 and more; custom large calibers available
Elastomeric Foam Wall Thickness (insulation layer thickness)
9mm, 13mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm (15/20/25mm commonly used for central air-conditioning chilled water pipes)
Single Length
Integral closed tube: standard 1.8m/2m
Slit self-adhesive tube: 0.95m, 1m, 2m
Custom cutting available for large calibers
Types and Parameters of Aluminum Foil Facing
Plain bright aluminum foil: thickness 8~12μm, reflectivity ≥85%
Grid embossed aluminum foil (mainstream for projects): 12~16μm, tensile resistant and anti-bulging
Reinforced mesh aluminum foil: 16~20μm, tear resistant and excellent weather resistance for outdoor use
PET laminated aluminum foil: anti-oxidation and UV resistant, specially for outdoor application
The aluminum foil greatly increases water vapor diffusion resistance factor μ up to 8000~20000
2. Core Thermal Performance
表格
| Parameter Item | Grade B1 Premium Product | Grade B1 Qualified Product | Grade B2 Product | Unit |
|---|
| Thermal Conductivity (0℃) | ≤0.032 | ≤0.034 | ≤0.036 | W/(m·K) |
| Operating Temperature Range | -40 ~ +110 | -40 ~ +110 | -40 ~ +110 | ℃ |
| Max Temperature Resistance of Self-adhesive Type | -40 ~ +85 | -40 ~ +85 | -40 ~ +85 | ℃ |
| Closed Cell Rate | ≥98 | ≥96 | ≥95 | % |
| Volumetric Water Absorption | ≤3.5 | ≤4.0 | ≤5.0 | % |
| Water Vapor Diffusion Resistance Factor μ (Aluminum Foil Clad) | ≥15000 | ≥8000 | ≥6000 | — |
| Thermal Reflectivity (Aluminum Foil Surface) | ≥88 | ≥85 | ≥85 | % |
3. Physical and Mechanical Performance
Apparent Density: 45~95 kg/m³ (national standard limit ≤95kg/m³)
Tensile Strength: ≥0.5 MPa
Elongation at Break: ≥150%
Low-temperature Bending (-20℃): No cracking or brittle fracture
Compression Resilience (50% compression): ≥90%
Water Vapor Permeability Coefficient: ≤1.5×10⁻¹⁰ g/(m·s·Pa)
4. Combustion Performance (GB 8624-2012)
Grade B1 (Hardly Flammable, standard for central air conditioning and fire protection projects)
Limiting Oxygen Index ≥32%
Smoke Density Rating (SDR) ≤75
Self-extinguishes after flame removal, no molten drips, low smoke emission
Grade B2 (Flammable, for civil hot water pipes and simple outdoor anti-freezing insulation)
Limiting Oxygen Index ≥26%
Note: Aluminum foil itself is Class A non-combustible material only used as outer cladding, which cannot change the inherent combustion grade of elastomeric foam core.
5. Acoustic Performance
Noise Reduction Coefficient (NRC): approx. 0.45~0.62, effective for pipeline vibration and water flow noise reduction
6. Differences Between Two Main Product Types
Integral Closed Aluminum Foil Clad Elastomeric Foam Tube
Integrally extruded and wrapped with aluminum foil, featuring tight sealing and optimal vapor barrier & anti-condensation effect, suitable for pre-buried installation of new pipelines
Slit Self-adhesive Aluminum Foil Clad Elastomeric Foam Tube
Longitudinal slit with pressure-sensitive adhesive, can be wrapped around old pipelines on site for renovation, easy construction and convenient disassembly for later maintenance
7. Main Applications
Thermal insulation and anti-condensation for central air-conditioning chilled & cooling water pipes, anti-freezing for water supply and drainage pipelines, heat insulation for hot water pipes, noise reduction for machine room pipelines, sun-proof and weather-resistant insulation for outdoor pipelines, cold insulation for low-temperature industrial media
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