What are the main applications of PP pipes?

**Residential use:** Ideal for hot and cold water supply pipes, underfloor heating pipes, kitchen and bathroom water supply and drainage pipes. **Building construction:** Suitable for centralized water supply, heating, and central air conditioning water circulation systems in office buildings, hotels, residential complexes, schools, hospitals, etc. Suitable for large-area, long-term stable operation. **Industrial fluids:** Suitable for clean fluid transportation, acid and alkali wastewater discharge, and industrial cooling circulation pipes in the chemical, food, pharmaceutical, and electronics industries. Its corrosion resistance and pollution-free properties make it suitable for harsh industrial environments. **Municipal and agricultural use:** Suitable for municipal building drainage, residential rainwater drainage, farmland irrigation, landscaping water supply, and shallow water supply and drainage projects.

Can polypropylene pipes be used for drinking water transportation?

Qualified PPR polypropylene pipes can absolutely be used for drinking water transportation. They are currently the core pipe material for home water purification and civil water supply worldwide. These pipes use food-grade PP pipe resin as raw material, strictly adhering to the hygiene and safety standards for drinking water transmission and distribution equipment. The production process is free of heavy metals and harmful additives, and long-term water flow will not release harmful substances or cause secondary water pollution. However, it is important to note that industrial-grade PPH pipes and pipes made from ordinary low-pressure PP resin do not meet hygiene standards. So they are only suitable for industrial sewage discharge and fluid transportation.

What is the highest temperature that polypropylene PP pipes can withstand?

Standard national standard PPR polypropylene pipes can stably transport hot water up to 95℃ for extended periods. They are perfectly suited for daily scenarios such as household hot water supply, hot water heating, and bathroom hot water supply, making them the preferred choice for residential hot water pipelines. The pipes can also withstand short-term high-temperature media up to 110℃, resisting deformation and damage from instantaneous high-temperature impacts. However, they are not suitable for long-term transportation of high-temperature steam or boiling water above 100℃. Prolonged operation at excessively high temperatures will damage the molecular structure of the pipe, leading to softening, thinning of the wall, and accelerated aging, making it highly susceptible to leaks, cracks, and other malfunctions, significantly shortening the pipe's lifespan.

What is the approximate lifespan of PP pipes?

High-quality polypropylene pipes, produced using virgin PP pipe resin, have an officially designed lifespan of over 50 years under proper installation, standard operating conditions, and indoor use away from light. This lifespan is calculated based on standard operating conditions of constant water pressure, normal temperature difference, and no external damage.

Will polypropylene pipes rust or scale?

High-quality polypropylene pipes will absolutely not rust or scale, which is one of their core advantages over traditional metal pipes. Polypropylene is a high-molecular-weight non-metallic thermoplastic material that does not contain iron or other metal components, eliminating the problem of oxidation and rust at its source. Furthermore, the inner wall of the pipe is extremely smooth, with a very low coefficient of friction, and the material's chemical properties are stable, preventing chemical reactions with scale, rust, minerals, and microorganisms in the water, thus preventing the adhesion and accumulation of impurities in the water flow. Long-term use will not result in narrowing of the pipe diameter, deterioration of water quality, or reduction of water flow.

Will PPR pipes freeze and crack in winter?

PPR pipes made from genuine, virgin materials have excellent freeze and low-temperature resistance. Compared to ordinary plastic pipes, they have stronger low-temperature toughness and will not crack or break in normal temperatures around -10℃, making them suitable for indoor pipe use in most regions during winter. However, in extreme sub-zero temperatures, if water freezes inside the pipe, the expansion of the frozen water will generate enormous internal pressure, exceeding the pipe's tolerance limit and causing it to crack and break.

Can polypropylene PP pipes be used outdoors for extended periods?

Polypropylene pipes are not suitable for prolonged exposure to direct sunlight. PP pipes, being made from resin, have relatively weak UV resistance. Prolonged direct exposure to ultraviolet rays will continuously damage the internal structure of the pipe. The high molecular chains cause pipes to gradually fade, yellow, and become brittle, significantly reducing their toughness and compressive strength, accelerating aging, and directly shortening their lifespan. If outdoor installation is necessary, a professional sun-protective insulation layer and shading devices must be installed beforehand to block direct ultraviolet radiation. Proper outdoor protection is crucial to ensure the long-term stable use of the pipes.

Which is better, PP pipes or PVC pipes?

There is no absolute superiority or inferiority between polypropylene and PVC pipes. The core differences lie in their applicable scenarios, material properties, and intended uses. Selection should be based on project requirements. Polypropylene pipes are high-temperature resistant, tough, have a high hygiene rating, are non-toxic and harmless, and support both hot and cold water, making them the preferred material for drinking water supply, HVAC, and home improvement projects. PVC pipes, on the other hand, have extremely poor high-temperature resistance, are brittle, have lower hygiene standards, and are more economical. They are only suitable for non-water supply scenarios such as building drainage, sewage, electrical wiring, and agricultural drainage.

What are the connection methods for polypropylene pipes?

**Butt fusion:** Suitable for large-diameter polypropylene pipes. The two ends of the pipe are heated using a hot melt machine, melted, and then butt-jointed and pressed together. **Cooling and forming a solid formation:** This method offers excellent sealing and is widely used in municipal and industrial large-scale pipeline projects. **Hot-melt socket connection:** The most common connection method in home decoration. The pipe and fitting interface are heated, and then spliced together with a socket. It is simple to operate, provides a tight connection, and is suitable for small-diameter pipes (DN20-DN32), eliminating the risk of leakage. **Heterogeneous material connection:** With copper wire and adapters, polypropylene pipes can be connected to metal pipes, valves, and equipment. Suitable for both new and old pipeline renovations and equipment docking.

Titanium Dioxide Paint Grade: Performance Index, Applications

Home » Titanium Dioxide Paint Grade: Performance Index, Applications

What Is Titanium Dioxide Paint Grade

Titanium dioxide paint grade is a high-purity titanium dioxide powder pigment specifically developed for paint coating applications. It is currently the most balanced and widely used coloring raw material in the coatings industry. With its exceptional light scattering properties, ultra-high hiding power, pure whiteness, excellent weather resistance, and stable chemical properties, it is widely compatible with all types of coating systems, including water-based paints, oil-based paints, industrial paints, architectural paints, automotive paints, powder coatings, and anti-corrosion paints.

In coating formulations, paint-grade titanium dioxide not only plays a fundamental role in coloring and covering the substrate, but also directly determines the finished coating’s resistance to yellowing, outdoor lifespan, film gloss, storage stability, and appearance. Whether for civil building coatings, industrial equipment corrosion protection, high-end automotive paints, or furniture, toy, and machinery coatings, high-quality paint-grade titanium dioxide is a core raw material for ensuring coating quality.

Items	Brands	Applications
BLR-895	Lomon Billions	Outdoor building paints, industrial coating
BLR-896		Indoor and outdoor building paints, industrial coating
R-996
BLR-698
BLR-699
LR-972
BLR-891		Indoor building paint, industrial coating
LR-961
LR-982
R-298	Pangang	carpentry paint, automotive repair paint, architectural paint, industrial paint
R-248		Architectural coatings, powder coatings
R-5566		Architectural coatings, industrial coatings
CR-350		High-end decorative paint, automotive paint, industrial paint
R-231	CNCC	Matt architectural coating
R-2219		Powder coating
R-2196		Solvent-based paint latex paint, industrial paint
R-219		Powder coatings, road paint

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What are the main performance requirements for paint-grade titanium dioxide?

Unlike plastic-grade, paper-grade, cosmetic-grade, and food-grade titanium dioxide, all production indicators, process standards, and modification schemes for titanium dioxide paint grade are designed around the dispersion, coloring, weather resistance, storage, and film-forming requirements of paint systems.

Industry standards stipulate that qualified paint grade titanium dioxide has a purity of no less than 93%. The core particle size is strictly controlled within the optimal visible light scattering range of 0.2-0.3μm. This particle size range maximizes the scattering of natural light, achieving excellent hiding and whitening effects. Simultaneously, the product undergoes inorganic element coating modification with aluminum, silicon, zirconium, combined with organic surfactant treatment, completely solving the defects of pure titanium dioxide powder such as easy agglomeration, poor dispersibility, excessively high photoactivity, and easy aging of paint films. Titanium dioxide paint grade is perfectly compatible with various coating systems, including water-based, solvent-based, powder, and radiation-cured coatings, making it an indispensable core raw material in modern coating production.

What Are Core Performance Advantages of Paint-Grade Titanium Dioxide?

>> Superior Hiding Power, Reduced Formulation Costs

Paint-grade titanium dioxide possesses the best light scattering ability among all white pigments. Its precise particle size of 0.2-0.3μm allows for omnidirectional scattering of visible light, and a small amount is sufficient to completely cover the base color of various substrates such as wood, metal, walls, and plastics. Compared to traditional lithopone, its hiding power is 3-5 times higher. With the same hiding power, the amount of pigment added can be significantly reduced, effectively lowering the raw material costs of coating production. Titanium dioxide paint grade is particularly suitable for thin-coat coatings and coating requirements on high-transparency substrates.

>> High Whiteness and High Tinting Strength, Pure and Stable Paint Film Color

Through high-purity raw material purification and refined processing, high-quality titanium dioxide paint grade can achieve a whiteness of over 95%, with a pure and transparent tone, free from defects such as graying, bluish tinge, or yellowing. Its tinting strength far surpasses that of ordinary white pigments, achieving ultimate whiteness in pure white paint production. In colored paint formulations, it allows for precise adjustment of color saturation, resulting in more uniform color mixing and richer hues, effectively preventing quality issues such as color difference, fading, and dulling between different batches of paint.

>> Excellent UV resistance and weather resistance, extending paint film lifespan

Paint-grade TiO2 powder, modified with multiple layers of inorganic coating, efficiently reflects, absorbs, and blocks ultraviolet rays, fundamentally inhibiting photoaging, chalking, cracking, loss of gloss, and fading of the coating. Outdoor coatings with this ingredient can extend paint film lifespan by 3-8 times, enduring long-term exposure to complex outdoor environments such as sunlight, rain, high temperatures, low temperatures, and sandstorms. It is a core raw material for outdoor coating products such as architectural exterior wall paints, outdoor industrial paints, automotive topcoats, and bridge anti-corrosion paints.

>> Excellent dispersibility and compatibility, suitable for all coating systems

Paint-grade titanium dioxide undergoes a special organic surface modification treatment, exhibiting excellent hydrophilic and oleophilic balance. It can be quickly and uniformly dispersed in most coating systems, including water-based coatings, oil-based solvent-based coatings, powder coatings, UV-cured coatings, and high-solids coatings. During storage, it is less prone to agglomeration, sedimentation, stratification, and clumping, ensuring both long-term storage stability and a uniform, smooth, particle-free, pinhole-free, and color-brightening finish after application.

>> Chemically inert and stable, corrosion-resistant and acid/alkali-resistant

Coating-grade titanium dioxide powder is extremely chemically stable and does not react with acids, alkalis, salts, organic solvents, or corrosive gases at room temperature. It possesses excellent resistance to acids, alkalis, salt spray, and corrosion. It is suitable for demanding coating applications such as industrial anti-corrosion paints, chemical equipment paints, marine coatings, and pipeline anti-corrosion paints. The coating will not peel off or fail due to substrate corrosion or environmental erosion, significantly improving the protective capabilities of industrial equipment and facilities.

>>Adjustable gloss, adaptable to all coating needs

Through differentiated surface coating and post-modification processes, coating-grade titanium dioxide in three mainstream grades (high-gloss, semi-matte, and matte) can be produced. High-gloss TiO2 finishes create a mirror-like, high-end paint surface, suitable for automotive paints, high-end furniture paints, and appliance topcoats. Matte TiO2 finishes offer a smooth, non-reflective texture, suitable for interior wall paints and commercial coatings. Semi-matte TiO2 finishes balance texture and practicality, suitable for most civilian and industrial coatings, offering excellent versatility.

Two core types of paint-grade titanium dioxide: Rutile vs. Anatase

Rutile paint-grade titanium dioxide

Rutile paint-grade titanium dioxide has a dense and regular crystal structure, extremely high molecular stability, and very low photoactivity, virtually eliminating photocatalytic aging of the paint film. Its hiding power, tinting strength, weather resistance, UV resistance, and chalking resistance are all superior to anatase titanium dioxide. After modification with a silicon, aluminum, and zirconium composite coating, it shows no significant chalking, fading, or loss of gloss issues with long-term outdoor use. This category is suitable for all outdoor coatings, high-end interior coatings, automotive paints, industrial anti-corrosion paints, high-end furniture paints, exterior wall insulation paints, and other high-end applications. Over 95% of high-end industrial coatings and outdoor architectural coatings use rutile titanium dioxide.

Anatase paint-grade titanium dioxide

Anatase grade has a relatively loose crystal structure, weak molecular stability, and high photoactivity. Under long-term UV exposure, it is prone to chalking, yellowing, and cracking of the paint film, and has poor weather resistance, making it unsuitable for long-term outdoor coating applications. However, this product has slightly higher whiteness, excellent dispersibility, low production cost, and outstanding cost-effectiveness. It is mainly suitable for interior wall paints, furniture primers, toy paints, low-temperature general coatings, and temporary coatings—applications with lower weather resistance requirements. Its slight photochromic properties also allow it to be used in self-cleaning road paints and concrete coatings, achieving a special effect of automatic dust removal on the coating surface.

What Are Main Applications of Coating-Grade Titanium Dioxide?

Architectural Coatings

Architectural coatings are divided into two main categories, interior wall paints and exterior wall paints. Interior wall paints emphasize high whiteness, fine texture, low sedimentation, and no odor. High-cost-performance anatase titanium dioxide or ordinary sulfuric acid process rutile products can be selected. Exterior wall paints prioritize weather resistance, UV resistance, chalking prevention, and fading prevention, requiring the use of well-coated rutile-type coating-grade titanium dioxide.

Industrial protective coatings

The type includes equipment paints, machinery paints, pipeline paints, and anti-corrosion paints. These applications involve complex operating conditions and highly corrosive environments, demanding extremely high levels of chemical stability, salt spray resistance, acid and alkali resistance, and weather resistance from pigments. For these applications, chloride-process or high-end sulfuric acid-process rutile titanium dioxide is preferred, effectively enhancing the coating’s corrosion resistance and extending the lifespan of industrial equipment.

Automotive coatings

Categorized as original equipment manufacturer (OEM) topcoat, repair paint, primer, and clear coat, have stringent requirements for gloss, color stability, weather resistance, and scratch resistance, representing a high-end segment of the coatings industry. High-purity, high-gloss, and highly weather-resistant chloride-process rutile-type coating-grade titanium dioxide is essential to ensure long-term gloss, prevents yellowing and loss of shine, and is suitable for the complex outdoor driving environment.

Powder coatings and specialty coatings

Powder coatings are solvent-free, environmentally friendly, and pollution-free, but require extremely high levels of dispersibility, high-temperature resistance, and storage stability of titanium dioxide. Well-modified rutile titanium dioxide products must be selected to avoid discoloration, agglomeration, and film defects during high-temperature curing. Furthermore, in specialty coatings such as UV-cured coatings, water-based environmentally friendly coatings, and self-cleaning coatings, dedicated coating-grade titanium dioxide is also a core suitable raw material.

What are the precise selection criteria for titanium dioxide paint grade?

First, select according to the application scenario. For indoor normal temperature and low-requirement coating scenarios, anatase products are preferred, balancing cost-effectiveness and basic performance. For outdoor coatings, high-end paint surfaces, anti-corrosion coatings, and long-term use scenarios, rutile products must be selected to ensure weather resistance and stability.

Second, select according to the coating process. Water-based coatings use hydrophilic modified versions. Oil-based coatings use oleophilic modified versions. Powder coatings use high-heat-resistant and highly dispersible dedicated versions.

Third, select according to quality requirements. Ordinary civilian coatings use sulfuric acid process products. High-end coatings use chlorination process products.

Fourth, select based on cost budget. For mass-market coatings, choose cost-effective rutile or anatase products using the sulfate process. For high-end custom coatings, choose high-end chlorination process products.

FAQ for Coating-Grade Titanium Dioxide

1. What is the difference between coating-grade titanium dioxide and ordinary titanium dioxide?

Coating-grade titanium dioxide undergoes precise particle size control, inorganic coating, and organic modification, focusing on optimizing hiding power, dispersibility, weather resistance, and film compatibility. Ordinary general-purpose titanium dioxide, without targeted modification, has a chaotic particle size distribution, is prone to agglomeration, and has poor weather resistance, failing to meet the core requirements of coatings for film formation, aging resistance, and stable storage.

2. How to choose between rutile and anatase coating-grade titanium dioxide?

The core basis for selection is the coating’s application scenario and performance requirements. For outdoor coatings, high-end indoor paints, industrial anti-corrosion, automotive paints, and other scenarios with high requirements for weather resistance, UV resistance, and fade resistance, rutile products must be selected.

For general interior wall paints, primers, temporary coatings, and cost-sensitive general coatings, anatase products offer a higher cost-performance ratio. They meet basic coloring and hiding needs while effectively controlling production costs, making them suitable for mass-market consumer coating applications.

3. What are the core differences between sulfuric acid process and chloride process titanium dioxide for coatings?

The core differences lie in product quality, environmental friendliness, and applicable scenarios.

The sulfuric acid process is low-cost and cost-effective, producing both types of products to meet the needs of low- to mid-range coatings. However, its purity, particle size uniformity, and weather resistance are generally lower, and its environmental emissions are higher.

The chloride process is environmentally friendly and has a closed system, producing products with very few impurities, high purity, stable performance, and superior gloss and weather resistance. It targets the high-end coatings market, but requires significant equipment investment and has a higher price, making it suitable for high-end automotive paints and high-end outdoor industrial paints.

4. What is the optimal addition ratio for coating-grade titanium dioxide?

There is no fixed value for the addition ratio; it needs to be adjusted according to the type of coating, coating thickness, and hiding requirements. The addition ratio of titanium dioxide to conventional pure white architectural coatings and industrial topcoats is 15%-25%, achieving excellent hiding power and whiteness. For light-colored coatings, this can be reduced to 10%-18%. For thick-coat anti-corrosion coatings, it can be fine-tuned to 20%-28%. For thin-coat topcoats, it should be controlled below 15%. Excessive addition will lead to a brittle paint film prone to cracking, while insufficient addition will result in insufficient hiding power and the base color showing through.

5. Can titanium dioxide paint grade be used in both water-based and oil-based general-purpose coatings?

Special-purpose general-purpose coating-grade titanium dioxide can be used in both water-based and oil-based systems. Based on a balanced hydrophilic and oleophilic modification process, it can be uniformly dispersed in both aqueous and oil-based systems, making it compatible with most general-purpose coating products. However, it is not recommended for high-end specialty coatings. High-end oil-based high-gloss paints require oleophilic-enhanced modified versions. High-solids water-based environmentally friendly paints require hydrophilic-enhanced modified versions.