Phenolic Foam Pipe | Grade A Non-combustible Pre-insulated Pipe for HVAC, Fire Protection & Cold Storage
1. Product Overview
Phenolic foam pipe, commonly known as phenolic pipe shell, is a GB 8624 Grade A non-combustible pipeline insulation material. Fabricated via integral foaming of modified phenolic resin, this rigid thermosetting pipe is available with plain, aluminum foil or fiberglass surface finishes. Featuring low smoke, zero toxicity and full hydrophobic properties, paired with exceptional wide-temperature stability, it serves as a premium pre-insulated pipe solution for HVAC systems, fire protection pipelines, cold storage facilities and various low-temperature industrial piping projects.
2. Product Types & Specifications
This product is an integrally molded rigid pipe shell, supplied in split self-adhesive and surface-protected types. It allows easy wrapping and tight fitting for circular pipes, accommodating diverse on-site installation needs.
Surface Facing: Plain board, single/double-sided aluminum foil, reinforced aluminum foil, fiberglass cloth
Pipe Diameter: DN15～DN600 in stock, custom mold production for non-standard sizes
Insulation Thickness: 15/20/25/30/40/50mm, customizable thickness from 20mm to 100mm
Standard Length: 1000mm per piece, custom cutting service available
3. Core Product Features
Grade A Non-combustible & Reliable Fire Safety
Compliant with GB 8624 Grade A non-combustible standards. The material only carbonizes under flame exposure, with no molten dripping, flame propagation, dense smoke or toxic emission. It achieves a smoke density rating SDR ≤75, delivering low-smoke and non-toxic performance during fire incidents. It is an ideal safe alternative to flammable PU and polystyrene insulation pipes for projects with strict fire protection requirements.
Ultra-low Thermal Conductivity & Stable Energy Efficiency
Tested per GB/T 10294 standards, the thermal conductivity is ≤0.030 W/(m·K) @ 25℃. Its dense closed-cell structure effectively minimizes cold and heat transfer across pipeline surfaces, delivering consistent thermal insulation and long-term energy-saving performance for building and industrial piping systems.
Ultra-wide Temperature Adaptability
It supports continuous stable operation within a temperature range of -196℃ to +200℃. The rigid thermosetting structure resists brittle cracking under ultra-low cryogenic conditions and prevents thermal shrinkage deformation at medium temperatures, suitable for both deep freeze preservation and conventional medium-temperature insulation scenarios.
High Closed-cell Hydrophobicity & Anti-condensation Performance
With a closed-cell rate ≥90% (GB/T 10799), water repellency rate ≥98% (GB/T 10299) and volume water absorption controlled below 3%, the product features superior hydrophobic performance. It effectively blocks moisture penetration, inhibits mildew growth and eliminates pipeline condensation, maintaining stable insulation performance in long-term humid operating environments.
Superior Dimensional Stability
The thermosetting molecular structure ensures stable physical properties under fluctuating temperatures. After 48-hour constant ageing at 70℃, the dimensional change rate remains ≤1%. It effectively resists cracking, delamination and warping, ensuring permanent close fitting and intact insulation structure on pipelines.
Formaldehyde-free Formula & Extended Service Life
Free of formaldehyde, fluorine and harmful volatile substances, this insulation pipe is clean, eco-friendly and fully compliant with indoor and clean room construction standards. It boasts excellent acid, alkali and ageing resistance, delivering a service life of over 20 years under standard installation and operating conditions.
Microporous Structure for Effective Noise Reduction
The unique internal microporous structure achieves a noise reduction coefficient NRC ≥0.7 per ASTM C423 testing standard. It efficiently absorbs airflow friction noise and mechanical vibration noise, greatly improving the operational quietness of HVAC and industrial pipeline systems.
4. Technical Parameters
Base Material: Phenolic resin rigid closed-cell foam
Fire Rating: GB 8624 Grade A Non-combustible (low smoke, non-toxic)
Thermal Conductivity: ≤0.030 W/(m·K) @ 25℃ (GB/T 10294)
Continuous Temperature Range: -196℃～+200℃
Closed-cell Rate: ≥90% (GB/T 10799)
Water Repellency Rate: ≥98% (GB/T 10299)
Volume Water Absorption: ≤3%
Dimensional Change Rate: ≤1% (70℃, 48h)
Smoke Density: SDR ≤75 (GB/T 8627)
Environmental Performance: Formaldehyde-free, fluorine-free, zero harmful volatiles
Standard Pipe Diameter: DN15～DN600 (custom non-standard sizes available)
Insulation Thickness: 15/20/25/30/40/50mm (custom thickening supported)
Unit Length: 1000mm (custom cutting available)
Execution Standard: GB 8624 Grade A, EN 13501-1 Class A
Test Standards: GB 8624, GB/T 8627, GB/T 10294, GB/T 10299, GB/T 10799, ASTM C423
Certification Documents: GB 8624 Grade A, EN 13501-1 Class A (CE optional), formaldehyde-free test report and MSDS available
5. Selection Guide
Phenolic foam pipe features outstanding Grade A fireproof performance, far exceeding conventional NBR/PVC rubber plastic and PU insulation pipes. Though its thermal conductivity is slightly higher than PU materials, it delivers dust-free installation, full waterproof capability and stable humid-environment adaptability that Rock Wool Blanket cannot achieve.It serves as the optimal insulation choice for fire-sensitive and high-cleanliness pipeline projects, and is not suitable for continuous working temperatures above 200℃.
6. Main Application Scenarios
HVAC Chilled Water Pipeline Insulation: Tailored for central air conditioning chilled water pipelines, it effectively prevents surface condensation and cold energy loss, lowers system operating power consumption and ensures stable and efficient HVAC operation.
Fire Sprinkler Pipeline Protection: Provides professional fire-rated insulation cladding for building fire sprinkler pipelines, fully meeting strict fire inspection and acceptance standards for civil and commercial construction projects.
Cold Storage Low-temperature Pipeline Insulation: Ideal for long-term constant-temperature insulation of refrigerant pipelines in cold storage and quick-freezing workshops, resisting freeze-thaw cycling damage and moisture infiltration in ultra-low temperature environments.
Building Plumbing & Heating Insulation: Offers reliable anti-freezing, heat preservation and noise reduction performance for indoor water supply and heating pipelines, effectively avoiding pipeline cracking, condensation and dripping issues.
Industrial Low-temperature Pipeline Engineering: Suitable for insulation, moisture-proof and anti-ageing protection of low-temperature process pipelines in chemical, marine and new energy industrial scenarios.
7. Installation Guidelines
Surface Treatment: Keep the pipeline outer wall flat, dry, rust-free and dust-free to ensure full contact and tight fitting of insulation pipes.
Cutting Processing: Lightweight and easy to process on site, it can be freely cut and grooved to match elbows, tees and other special-shaped pipe fittings.
Splicing & Sealing: Adopt flat butt joint installation, and fully seal all splicing gaps to eliminate cold bridges and prevent cold and heat leakage.
Surface Protection: Seal all aluminum foil joints with dedicated adhesive tape. For outdoor exposed pipelines, add iron sheet or metal protective covering to extend overall service life.
8. Packaging & Purchasing Information
Packaging: Packed with PE protective film and fixed with pallets, featuring moisture-proof, shockproof and compression-resistant performance for long-distance land and sea transportation.
Stock & Customization: Standard pipe diameters, thicknesses and aluminum foil facings are in stock for fast delivery; non-standard sizes and special surface treatments are available for custom production.
Delivery Time: 3–5 working days for in-stock orders; 15–20 working days for customized orders.
MOQ & Sample Policy: The minimum order quantity is one pallet (around 80 pieces). Small trial orders are acceptable. Free samples are provided, with customers responsible for freight costs.
Certification & Service: Complete GB 8624 Grade A, EN 13501-1 Class A fire test reports, formaldehyde-free certificates and MSDS documents are supplied to support global project approval. Professional free on-site construction guidance is provided.
Warranty: Under standardized installation and normal operating conditions, the product maintains stable performance for over 5 years, effectively reducing subsequent operation and maintenance costs.
9. FAQ
Q1: What is the fire rating of phenolic insulation pipe?
A1: It meets GB 8624 Grade A non-combustible standard, with low smoke, non-toxic and drip-free features, fully satisfying high-standard fire inspection requirements for various projects.
Q2: What is the temperature resistance range?
A2: It supports continuous stable operation from -196℃ to +200℃, and is not applicable for long-term service above 200℃.
Q3: Will it absorb water and mildew in humid environments?
A3: The integrated closed-cell hydrophobic structure effectively blocks moisture intrusion, preventing water absorption and mildew growth while retaining stable insulation performance in humid conditions.
Q4: What are the differences from PU insulation pipes?
A4: PU pipes deliver slightly lower thermal conductivity, while phenolic foam pipes possess superior Grade A non-combustible performance, making them irreplaceable for projects with strict fire protection standards.
Q5: Are non-standard diameters and thicknesses available?
A5: Full non-standard size customization is supported, and flexible on-site cutting adapts to various complex pipeline installation conditions.
Q6: How to choose between phenolic pipe and rock wool pipe?
A6: Phenolic pipe features waterproof, dust-free and clean installation, ideal for conventional HVAC and building pipelines. Rock wool pipe is suitable for ultra-high-temperature industrial pipelines above 600℃.
10. Product Summary
Phenolic foam pipe is a high-performance Grade A non-combustible, formaldehyde-free pre-insulated pipeline material. Combining ultra-wide temperature resistance, excellent hydrophobicity and dust-free clean construction, it effectively compensates for the fire hazards and performance defects of traditional PU, rubber and rock wool insulation pipes. It is a cost-effective and reliable insulation solution widely adopted for HVAC systems, fire protection projects, cold storage facilities and industrial low-temperature pipeline energy-saving projects.
