China GRP Foam Sandwich Panels Core Materials & Factory

High-Performance Insulation Core Solutions for Fiberglass Reinforced Plastics (FRP/GRP) Composite Systems

TECHNICAL WHITEPAPER

Structural Principles of GRP/FRP Foam Sandwich Panels

Analyzing how advanced closed-cell elastomers and composite structures work together to deliver lightweight, highly insulated panel systems.

Glass Reinforced Plastic (GRP), also known as Fiber Reinforced Plastic (FRP), is widely utilized as the outer skin of sandwich panels in modern manufacturing. However, the core material defines the overall thermal efficiency, impact resistance, and weight optimization of the composite. By utilizing Kingflex's highly integrated closed-cell NBR/PVC rubber foam cores, engineers achieve a perfect synergy of high structural integrity and thermal resistance.

Standard sandwich panels require a core that exhibits high shear strength, resistance to water absorption, and low thermal conductivity. Traditional materials like PU or EPS often suffer from cracking or moisture ingress under thermal stress. In contrast, elastomeric rubber foam cores offer exceptional compression resilience (over 80%) and are fully closed-cell (>98%), ensuring stable thermal performance even in harsh, high-moisture environments.

From cryogenic liquid natural gas (LNG) pipe insulation to heavy-duty building facades, the integration of fiberglass skins with robust elastomer foam cores creates an impermeable barrier against energy loss and environmental damage.

Closed-Cell Matrix (Over 98%)

Prevents water absorption and vapor migration, retaining thermal insulating properties (K-value) over decades of continuous field use.

High Compression Resilience

With an elastic recovery rating exceeding 80%, these cores absorb structural shifts and mechanical vibrations without delaminating.

MANUFACTURING POWERHOUSE

China Supply Chain & Factory Advantages

Operating from Dacheng, China—the capital of green-building materials—Kingflex delivers large-scale production, rigorous quality control, and global logistics capability.

Kingflex Manufacturing Facility

Kingflex Insulation Co., Ltd. represents a professional manufacturing and trading combo for thermal insulation products. Our advanced production complex concentrates research, development, production, and sales under one energy-saving, environmentally friendly enterprise. Our core operating philosophy centers around energy optimization and consumption reduction.

Our historical lineage traces back to the Jinwei Group, established in 1979, bringing more than 40 years of pioneering thermal insulation research. Jinwei Group was the first manufacturer of thermal insulation materials north of the Yangtze River, paving the way for China's industrial insulation standards.

At present, our manufacturing facilities feature 5 large automatic assembly lines, generating an annual production capacity of more than 600,000 cubic meters. This immense capacity has secured Kingflex's status as a designated enterprise by the Chinese Ministry of Energy, Ministry of Electric Power, and Ministry of Chemical Industry.

40+
Years of Industry History
600K+
m³ Annual Capacity
66+
Countries Exported To
8
R&D Senior Engineers
SPECIFICATIONS

GRP Core & Elastomeric Foam Standard Dimensions

Engineered to exact dimensional and performance specifications to fit precise modular building and cryogenic structural configurations.

Black Rubber Foam Insulation Sheet Roll

Ideal for large-area GRP panel backing, HVAC duct systems, and structural partition insulation.

Parameters Standard Specification
Material Base NBR/PVC Premium Blend
Thickness Range 6mm - 50mm
Core Density 40 - 55 kg/m³
Service Temp. Range -40℃ to +105℃ (ULT up to -200℃)
Closed-Cell Rate > 98%
Compression Resilience > 80%

Black Rubber Foam Insulation Pipe

Specifically extruded for pipeline thermal containment, prevention of condensation, and cryogenic line integration.

Parameters Standard Specification
Material Base NBR/PVC Premium Blend
Thickness Range 9mm - 40mm
Inner Diameter (ID) 6mm - 114mm
Core Density 40 - 55 kg/m³
Flame Spread Index Class 0 / Class 1 (BS 476 Approved)
Water Permeability Excellent Moisture Resistance Factor (μ > 10,000)

1. Uniform Foaming Structure

Evenly distributed cell morphology delivers stable long-term K-values and stops thermal bridging.

2. Fire Retardant Properties

Engineered self-extinguishing properties that off-gas minimally under intense heat scenarios.

3. Reduced Cracking Risk

Superior flexibility ensures pipelines do not freeze, crack, or deform under dynamic stress.

APPLICATION RANGE

Localized Applications of GRP Panels & Core Insulations

Our product systems serve diverse architectural, mechanical, refrigeration, and transportation sectors globally.

HVAC SYSTEMS

Central Air Conditioning

Providing thermal barrier insulation for complex air ducts and supply pipe networks to prevent energy loss and condensation pooling.

ARCHITECTURAL

Building Envelopes

Integrated into GRP sandwich walls, ceilings, and roofs for commercial and industrial structures requiring sound dampening and thermal regulation.

PROCESS PIPING

Industrial Steam & Storage

Shielding high-temperature steam distribution lines, petrochemical storage vessels, and refinery piping against corrosion-under-insulation (CUI).

COLD CHAIN

Refrigeration & Logistics

Serving as core insulation panels in refrigerated truck bodies, storage vaults, and food-processing cleanrooms.

CRYOGENICS

ULT & LNG Containment

Specialized elastomeric cryogenic layers that maintain flexibility and block heat ingress down to ultra-low temperatures.

INFRASTRUCTURE

Rail Transit & Marine

Providing lightweight structural panels that satisfy tight weight constraints and flame-smoke-toxicity (FST) railway regulations.

COMPLIANCE & QUALITY

Global Compliance & Certifications

To operate reliably in international engineering domains, Kingflex products adhere to standard requirements defined by leading global authorities. Our materials undergo routine auditing to maintain their verified performance indices.

Our solutions comply with the following testing standards:

  • BS 476 Parts 6 & 7: Class 0 and Class 1 fire rating compliance for public building safety.
  • CE Certification: Standardized European conformity covering insulation performance.
  • REACH & ROHS: Fully compliant; free from heavy metals, halogenated flame retardants, and ozone-depleting substances.
  • UL94: Evaluated for horizontal and vertical burning behavior, confirming self-extinguishing properties.
  • ASTM: Regular laboratory checks verify core physical properties, density, and thermal transmission.

This strict adherence guarantees full project safety clearances and long-lasting mechanical properties.

R&D and Certificate Gallery

Research & Development Focus

Our dedicated team contains 8 professional engineers in the R&D Department, driving formulation improvements and structural innovations. Working closely with 6 professional international sales coordinators and a production workforce of 230 employees, we ensure quality control from chemical synthesis to loading.

GLOBAL PERFORMANCE

Project Deployments & Procurement Transparency

Reviewing our real-world construction projects and transparent procurement interactions with global project managers.

Industrial Deployments

Our core materials protect structural components and transport pipe systems in thermal, cryogenic, and maritime engineering works.

Procurement & Technical Support Transparency

We maintain full communication clarity. Below are actual screenshots demonstrating our active support, custom dimension coordination, and customer feedback across international orders.

TECHNICAL ASSISTANCE

Frequently Asked Questions & Answers

Comprehensive engineering clarifications on technical capabilities, fire behavior, composite panel structures, and shipping configurations.

Q1: What is elastomeric rubber foam insulation used for?
It is primarily used for HVAC air distribution ducts, chilled and hot water piping systems, building wall and envelope insulation, industrial chemical line temperature maintenance, acoustic dampening, and as a lightweight thermal core material inside fiberglass (GRP/FRP) sandwich panels to optimize structural and thermal efficiency.
Q2: Is Kingflex rubber foam insulation fire resistant?
Yes. Our elastomeric rubber foam insulation is engineered to resist flame spread and self-extinguish immediately upon source removal. It satisfies strict building safety tests, including BS 476 Part 6 & Part 7 (Class 0 and Class 1 approvals) and UL94 V-0 certifications, minimizing combustion risk.
Q3: What is the difference between rubber foam and rock wool insulation?
Elastomeric rubber foam is flexible and closed-cell, giving it high moisture and water vapor resistance without requiring separate barriers. This makes it ideal for chilled lines and high-condensation spaces. Rock wool is a fibrous mineral insulation that excels in extremely high-temperature systems and pure fire barrier divisions, but it is prone to moisture absorption if not sealed correctly.
Q4: Do you provide customized insulation products?
Yes. We offer fully customized manufacturing (OEM/ODM support). We can configure specific densities, custom interior/exterior diameters, variations in sheet thickness, and specialized laminates (such as aluminum foil or self-adhesive backings) to match custom GRP sandwich panel dimensions and architectural drawings.
Q5: What certifications do your products have?
Our products hold certifications for international standards, including BS 476, CE, REACH, RoHS, UL94, and ASTM. This guarantees compliance with quality, environmental health, and structural safety parameters required across Europe, the Americas, Asia-Pacific, and the Middle East.
Q6: Do Kingflex products have traceability?
Yes. Every production run undergoes continuous tracking. From raw chemical material sourcing to final dispatch inspection logs, each batch receives a distinct production code. This ensures complete transparency and accountability for industrial projects.
Q7: What thickness of Rubber foam insulation sheet roll can you produce?
Our manufacturing setup regularly extrudes rolls ranging from 6mm to 50mm in thickness. Thicker cross-sections can be engineered through custom multilayer hot-melt lamination processes under controlled manufacturing parameters.
Q8: What is the service life of rubber plastic pipe and board?
When installed correctly and operated within our recommended temperature ranges (-40℃ to +105℃), Kingflex systems provide a reliable service life of 10 to 15 years, maintaining thermal efficiency and structural integrity without degradation.
FACTORY WALKTHROUGH

Production Floor & Advanced Machinery Gallery

Visualizing our 600,000 m³ capacity facility, raw material warehouses, automated extrusion lines, and shipping centers.