Discover Kingflex industrial-grade thermal and cryogenic insulation solutions engineered for high performance, ease of installation, and reliable compliance.
How massive investments in sustainable building design, smart cities, and cryogenic engineering are driving advanced requirements for flexible elastomeric piping networks.
Variable Refrigerant Flow (VRF) and split systems are the backbones of modern architecture. These systems transport refrigerants at high and low-temperature extremes across long copper pipe networks. Precise insulation wall thicknesses prevent energy losses and rule out condensation risks in sensitive drop-ceilings.
For Ultra-Low Temperature (ULT) and LNG cryogenic installations, normal insulation materials fail as they become brittle. Elastomeric nitrile rubber foams designed specifically for sub-zero duties absorb continuous mechanical thermal shocks while keeping out ambient moisture vapor.
Corrosive seaside environments, dynamic chemical plants, and heavy-duty steam lines require insulation that is highly chemical resistant, prevents galvanic corrosion on copper structures, and maintains a stable structural K-value over long operating periods.
Designing high-performing HVAC/R assemblies requires exact matching between the Inner Diameter (ID) of the rubber tube and the Outer Diameter (OD) of the copper lines.
Copper tubes used in heating, cooling, plumbing, and low-temperature applications are categorized using nominal sizing conventions (such as Type K, L, M, and ACR). Standard flexible rubber foam insulation tubes are designed with a slight expansion clearance to slide smoothly over these copper outer diameters.
Choosing the correct insulation wall thickness (typically ranging from 6mm/9mm for standard condensation control, up to 50mm for deep industrial freezing systems) ensures the surface temperature of the outer insulation shell remains above the ambient dew point, completely eliminating condensation drip and mold risks.
| Insulation Inner Diameter (ID) | Matching Copper Tube Nominal Size (ACR) | Wall Thickness Range Available | Thermodynamic K-Value (at 0°C) | Ideal Application Scenario |
|---|---|---|---|---|
| 6 mm - 10 mm | 1/4" - 3/8" | 6mm / 9mm / 13mm | ≤ 0.034 W/(m·K) | Small-split HVAC lines, domestic refrigeration |
| 12 mm - 16 mm | 1/2" - 5/8" | 9mm / 13mm / 19mm | ≤ 0.034 W/(m·K) | VRF liquid and gas branch systems |
| 19 mm - 28 mm | 3/4" - 1-1/8" | 9mm / 13mm / 19mm / 25mm | ≤ 0.035 W/(m·K) | Commercial air conditioning main lines, hot water systems |
| 35 mm - 54 mm | 1-3/8" - 2-1/8" | 13mm / 19mm / 32mm / 40mm | ≤ 0.036 W/(m·K) | Industrial chilled water piping, chemical process flows |
| 67 mm - 114 mm | 2-5/8" - 4-1/8" | 19mm / 25mm / 32mm / 50mm | ≤ 0.038 W/(m·K) | High-capacity district pipelines, heavy industrial machinery |
Operating inside Dacheng, the world-renowned green building material capital of China, Kingflex provides unmatched supply chain resilience and cost management.
With 5 massive, highly automated assembly lines running continuously, Kingflex boasts an annual output capacity exceeding 600,000 cubic meters. This scale allows us to fulfill large-scale industrial municipal contracts and global wholesale demands without delay.
Every single batch of NBR/PVC foam is analyzed in our state-of-the-art R&D labs. We measure thermal conductivity, flame spread velocity, smoke density, and moisture resistance factor (u-factor) to assure matching parameters across every global zone.
Our thermal and cold preservation solutions conform to prestigious international standards. Kingflex products carry approvals including BS 476, CE, REACH, RoHS, UL94, and ASTM, offering peace of mind to project compliance managers globally.
Our raw material formula is a highly optimized blend of Nitrile Butadiene Rubber (NBR) and Polyvinyl Chloride (PVC). NBR delivers superior elastic mechanical recovery, low thermal conductivity, and flexibility at low temperatures, while PVC offers enhanced resistance to ozone, UV radiation, flame propagation, and chemical degradation.
Key Advantages:
Delivering quality consistency through strict material analysis and dynamic stress-testing labs.
Kingflex Insulation Co., Ltd. is a leading professional manufacturer and trading group specializing in energy-saving thermal, cold, and acoustic insulation products. Our R&D center and production plants are located in the Dacheng green building materials industrial zone, China. Our parent enterprise, the Jinwei Group, was established in 1979 and holds over 40 years of manufacturing experience. We were the very first manufacturer of thermal insulation materials north of the Yangtze River.
By blending R&D, direct manufacturing, and expert consulting services, Kingflex provides comprehensive solutions from project drawings to installation guidance. We support construction projects, petroleum refining, chemical complexes, aerospace programs, and shipbuilding industries across more than 66 countries.
The Kingflex technical group features 8 dedicated professional engineers in the R&D department, 6 international sales consultants, and 230 skilled production technicians, ensuring smooth processing of custom orders, fast manufacturing times, and detailed logistical tracking.
From extreme sub-zero applications to high-capacity HVAC duct networks, our clients share their installation feedback.
We work directly with distributors, mechanical contractors, and industrial developers worldwide, ensuring transparent communication and timely material deliveries.
Providing detailed engineering insights to help you specify the right insulation parameters for your projects.
Q1: What is elastomeric rubber foam insulation used for?
A1: It is mainly used for commercial and industrial HVAC ducts, air conditioning lines, hot and cold water pipes, building thermal insulation, acoustic buffering, and cryogenic/industrial pipeline insulation to prevent condensation and reduce heat transfer.
Q2: Is Kingflex rubber foam insulation fire resistant?
A2: Yes, our elastomeric NBR/PVC rubber foam insulation includes flame-retardant additives. It is self-extinguishing and meets key international safety certifications including BS 476 Class 0, UL94, and ASTM fire standards.
Q3: What is the difference between rubber foam and rock wool insulation?
A3: Rubber foam is highly flexible, features a closed-cell moisture-proof structure, and is ideal for HVAC/R condensation control. Rock wool is a fibrous material with high-temperature resistance, making it suitable for industrial furnaces and high-heat steam piping.
Q4: Do you provide customized insulation sizes and dimensions?
A4: Yes, we provide full OEM and ODM services. We customize insulation wall thicknesses, inner diameters (IDs), and special surface coatings (like aluminum foil) to meet specific design requirements.
Q5: What international certificates do your insulation tubes carry?
A5: Kingflex insulation materials are tested and certified under international protocols including BS 476, CE, REACH, RoHS, UL94, and ASTM standards, ensuring compliance across different markets.
Q6: Do Kingflex products offer full batch traceability?
A6: Yes, all Kingflex production batches are coded and tracked from raw materials through to final delivery, ensuring reliability and quality tracking.
Q7: What thicknesses of rubber foam sheet rolls can you produce?
A7: We produce rubber foam sheet rolls in thicknesses ranging from 6mm up to 50mm to suit various insulation and condensation control requirements.
Q8: What is the typical service life of your rubber foam pipes and boards?
A8: Under standard operating conditions and proper installation, our rubber foam products provide a service life of 10 to 15 years.
Q9: How do I select the proper wall thickness for copper pipe insulation?
A9: The thickness depends on the pipe's operating temperature, ambient temperature, and relative humidity. In humid environments, thicker walls are required to prevent condensation. We provide calculation support using engineering software based on ASTM C680 parameters.
Q10: What are the packaging and bulk shipping options for wholesale orders?
A10: Standard orders are packed in heavy-duty polyethylene bags or export cartons. We support bulk ocean freight and multi-port container transport, coordinating with international logistics networks for reliable global delivery.
Standard physical properties, performance data, and thermal specifications for Kingflex insulation systems.
Standard Dimensions & Technical Limits:
Common Applications: Suitable for air ducts, machinery housing, structural piping, large vessels, and architectural acoustics.
Standard Dimensions & Technical Limits:
Common Applications: HVAC lines, VRF air conditioning, refrigeration loops, process hot/cold water, and anti-freeze protection for exterior piping.
Explore our specialized solutions, from ultra-low temperature cryogenic line wraps to composite materials.
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