PPs Flame Retardant Boards

Product Model	PPs Series (Thickness 2–60mm)
Category	PP-PPs Sheets
Reference Price	Price on request

Hot Customizable for Working Conditions 10 Technical Parameters

Product Overview

Flame-retardant PPs sheets are engineering plastic sheets formed through continuous extrusion using flame-retardant grade polypropylene resin as the raw material. These sheets incorporate flame-retardant additives into conventional PP sheets, enabling self-extinguishing properties. When exposed to open flames, they prevent fire spread and extinguish themselves upon removal from the heat source, making them suitable for exhaust treatment and ventilation systems requiring fire safety.

The sheets feature smooth, uniform surfaces and colors, with standard options being porcelain white and cream yellow. Thickness ranges from 2mm to 60mm, and widths and lengths can be cut to meet processing requirements. Compared to metal sheets, flame-retardant PPs sheets have a lower density and weight, are rust-resistant and non-scaling, and do not undergo electrochemical corrosion in acidic or alkaline environments, resulting in a longer service life.

Flame-retardant PPs sheets are the primary raw material for Xicheng Environmental Protection in manufacturing spray towers, activated carbon adsorption boxes, ventilation ducts, corrosion-resistant tanks, and various non-standard equipment. These sheets can be processed into various shapes and structures through methods such as hot melt welding, elbow hot bending, and flange splicing. Welding strength reaches over 80% of the base material's strength, meeting the structural load requirements of corrosion-resistant equipment.

Working Principle

The flame-retardant mechanism of PPs sheets involves the addition of flame retardants to the polypropylene base material, altering its combustion characteristics. When the surface of the sheet contacts an open flame, the flame-retardant components promote rapid carbonization, forming an insulating layer that blocks oxygen and heat transfer to the sheet's interior while inhibiting the generation of flammable gases, preventing the flame from sustaining combustion. Upon removal of the heat source, the sheet extinguishes itself within a short period without producing molten drips that could ignite underlying materials.

The corrosion resistance of the sheets originates from the molecular structure of polypropylene. Polypropylene is a non-polar polymer with excellent chemical stability, offering strong tolerance to most acids, alkalis, and salt solutions. Acidic gases, alkaline mist, and corrosive liquids in the exhaust contacting the sheet's surface do not react chemically with the material, and the inner wall does not exhibit rust or progressive thinning like metal.

Structural Composition

Flame-retardant PPs sheets are homogeneous solid sheets with uniform material composition throughout, without layers or coatings, and dense cross-sections without voids. Manufactured through extrusion, they have minimal thickness tolerance in the direction of the thickness and surfaces treated with polishing for high flatness. During welding, electrodes fully melt with the sheet surface, resulting in neat and reliably sealed welds.

The sheets are categorized into three thickness ranges: thin sheets, medium-thick sheets, and thick sheets. Thin sheets are primarily used for coiling into round ducts and processing small components, medium-thick sheets for welding tower cylinders and equipment shells, and thick sheets for manufacturing liquid-bearing tanks and bases. The edges of the sheets are cut neatly, allowing for small butt joint gaps during splicing, which enhances welding efficiency and weld quality.

Specification and Model Table

The table below lists the standard thickness specifications and typical applications of flame-retardant PPs sheets. Non-standard widths and lengths can be cut to order.

Thickness	Typical Application	Processing Method
2–5mm	Round ducts, small components	Coil welding
6–12mm	Tower cylinders, valve bodies	Sheet welding
15–25mm	Equipment shells, tank walls	Flat welding
30–60mm	Bases, load-bearing structures	Thick plate welding

Product Features

Flame-retardant PPs sheets combine corrosion resistance with fire safety, serving as the foundation material for corrosion-resistant equipment. Key features include:

Addition of flame retardants for self-extinguishing properties, reducing fire spread risks
Resistance to acid, alkali, and salt corrosion, suitable for various corrosive exhaust and liquid environments
Homogeneous material without layers, ensuring reliable welding fusion and high weld strength
Approximately one-fifth the density of steel, resulting in lightweight equipment
Smooth surface without scaling, reducing internal resistance and facilitating cleaning and maintenance
Comprehensive thickness specifications, from thin to thick sheets, meeting diverse processing needs
Recyclable, with processing that does not produce toxic or harmful substances

Material	Flame Retardant Polypropylene (PP)
Sheet Color	White / Beige
Thickness range	2–60mm
Molding Process	Extrusion Molding
Flame Retardancy	Self-extinguishing
Corrosion resistance performance	Acid and Alkali Salt Resistant
Welding Method	Hot melt welding
Plate Type	Homogeneous solid plate
Relative Density	0.9–1.0
Processing Method	Cutting, Hot Bending, Welding

Application Industries

Corrosion-resistant lining plates for acid pickling tanks and exhaust channels in electroplating production lines
Tower body plates for acid-alkali exhaust gas treatment equipment in chemical enterprises
Flame-retardant duct plates for ventilation systems in semiconductor and photovoltaic factories
Corrosion-resistant inner linings for laboratory fume hoods and exhaust pipes
Corrosion-resistant enclosure structures for acid pickling workshops in metallurgical industries
Shell materials for tail gas absorption units in pharmaceutical factory reactors
Materials for odor collection hoods and transport pipelines in wastewater treatment plants

Typical Process Locations

PPs flame-retardant plates are positioned at the upstream stage of equipment manufacturing. After being cut to size in the workshop, the plates undergo processes such as rolling, bending, and welding to form spray tower bodies, duct sections, and tank wall panels, serving as the structural core of the entire corrosion-resistant equipment. The plates themselves are not directly installed on production lines but appear in equipment form at various nodes of the exhaust gas collection and treatment systems.

In ventilation systems, PPs plates are rolled into ducts that are laid along the workshop ceiling or exterior walls. The front end connects to gas collection hoods and exhaust equipment, while the rear end is integrated into purification towers or activated carbon boxes. The flame-retardant grade of the plates determines the fire safety of the ducts when installed indoors or in suspended ceilings, while the corrosion resistance determines the service life of the pipes in acidic or alkaline exhaust gas environments. Before processing, the thickness and flame-retardant grade of the plates are verified against equipment drawings. Rolling, bending, and welding are completed on clean tooling platforms, with full welds and leak detection. Finished and semi-finished products are padded and covered during transport and storage to prevent surface damage and prolonged sun exposure. Upon arrival, material certificates and flame-retardant reports are retained in batches for subsequent inspection and quality traceability.

Both materials are made of polypropylene as the base material. The difference lies in that the PP sheet is added with flame retardant components during the production process, enabling the material to self-extinguish when exposed to fire. Ordinary PP sheet will continue to burn and produce dripping when it comes into contact with an open flame, whereas the PP sheet can prevent the spread of fire when exposed to flames and will extinguish itself once the heat source is removed. In applications requiring fire resistance, such as exhaust gas treatment and indoor ventilation, PP flame-retardant sheet should be selected. The acid and alkali resistance of both materials is essentially the same, and the welding processing methods are also identical.

The PPs sheets are joined using hot melt welding, employing flame-retardant welding rods of the same material as the base material. The welding rod and the joint of the sheets are simultaneously heated to a molten state by a hot air gun and then pressed together to fuse. After cooling, a continuous and dense weld is formed. The welding quality depends on temperature control, welding rod selection, groove preparation, and welder proficiency. Properly executed welds can achieve strengths of over 80% of the base material. Thick plates and load-bearing welds should be grooved and welded in multiple passes. Visual and leakage inspections should be conducted after welding. After welding, the weld and the base material have the same material composition, retaining the same corrosion resistance and flame-retardant properties, without the rusting issues associated with metal welding. As long as the welding is performed according to the process and proper inspections are conducted, the sealing and service life of the weld area can match that of the base material.

The plate thickness should be comprehensively determined based on equipment dimensions, pressure-bearing requirements, and installation location; it is not necessarily more reasonable to use thicker plates. Coiled round ducts typically use thin plates, while tower cylinders are selected based on diameter using medium-thick plates. Only liquid-containing tanks and load-bearing bases require thicker plates. During selection, calculate the required wall thickness based on working pressure, medium density, and stiffener layout. Strength and stiffness meeting the requirements are sufficient. Excessive thickness not only increases material costs but also adds to equipment self-weight, coiling difficulty, and welding workload, ultimately reducing overall cost-effectiveness. Thin plates combined with a reasonable strengthening structure are often more economical than blindly increasing thickness. If uncertain, provide equipment diameter, height, and medium conditions, and the design or manufacturer can offer thickness recommendations based on experience.

The long-term operating temperature of flame-retardant PPs panels is similar to that of general polypropylene, making them suitable for handling corrosive gases in ambient to medium-temperature ranges. The specific temperature upper limit depends on the panel thickness, equipment structure, reinforcement method, and fixing form. The equipment should also avoid localized contact with high-temperature heat sources and radiant heat to prevent single-point overheating, which could cause the panels to soften and deform. For high-temperature exhaust gases, a pre-cooling section with a spray cooling stage should be installed before entering the plastic equipment to reduce the gas temperature to within the material's allowable range through gas-liquid contact. If the exhaust gas temperature remains high for extended periods or experiences instantaneous high-temperature impacts, consider selecting high-temperature-resistant stainless steel or fiberglass materials instead of directly using PP panels. When selecting, provide the continuous temperature, peak temperature, and composition of the exhaust gas to determine if pre-cooling or material replacement is necessary.

Yes. PPs sheets can be cut using woodworking circular saws, handheld cutters, and engraving machines. On-site construction involves cutting to measured dimensions, followed by splicing and welding using handheld hot-air welding guns. The processing method is largely consistent with workshop production. When cutting, use fine-toothed blades and control the feed speed to minimize edge chipping and burrs. The cut edges should be leveled with a scraper before welding. The on-site processing environment should be kept dry and well-ventilated. Clean the sheet surface of oil, dust, and moisture before cutting and welding to ensure weld fusion quality. During winter construction, the ambient temperature should not be too low, as this can reduce the sheet's toughness, making it prone to cracking during bending and curling. It is advisable to warm the sheets indoors first. Welds made on-site also require visual inspection, with load-bearing and sealing areas subjected to welding inspections according to workshop standards.

Two-color PP sheet materials have the same base material and flame retardancy level, with color differences resulting from masterbatch ratio. Their corrosion resistance, heat resistance, and welding performance are essentially consistent, so performance differences should not be a concern when selecting materials based on color. The off-white sheet is a traditional color in the corrosion-resistant equipment industry and is widely used in spray tower, duct, and tank processing, with relatively sufficient market stock. The porcelain white sheet has a neat and bright appearance, commonly used in laboratory equipment, exposed piping, and applications with high requirements for cleanliness. When welding, matching colored electrodes are used for each color to achieve more harmonious weld appearance. Color selection primarily considers on-site appearance coordination, supply habits, and inventory status, without affecting the core performance of the material. If the project has no special color requirements, the commonly used off-white color can be supplied.

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