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Why Does Halogen-free Low-smoke Flame-retardant Cable Crack?
2022 / 09 / 24
The main reasons for environmental stress cracking of halogen-free low-smoke flame retardant materials are as follows: (1) Caused by the characteristics of the polymer: due to the high content of flame-retardant fillers such as aluminum hydroxide and magnesium hydroxide, the strength of the polymer is reduced, the elongation and flexibility are also reduced, and the tear resistance and crack resistance are inherently insufficient . Currently, the carriers of halogen-free materials are usually low-density polyethylene and EVA. After being flame-retardant, the hardness of the mixture is higher, especially reaching the flame-retardancy of iec332-1 (single burning level, the corresponding oxygen index of the material is generally greater than 28), and the hardness of the material is often greater than Shore a90. (2) Material extrusion process: Based on the high filling characteristics of metal hydrate flame-retardant, halogen-free and low-smoke materials. If the process temperature and screw compression ratio are not properly selected during the extrusion process, the hydrous oxide will decompose and the polymer bond will break under high shear. Due to the large compression ratio, the speed of the extruder cannot reach the normal level, resulting in a long residence time between the barrel and the screw. At high temperatures caused by friction, hydrated oxides decompose prematurely, creating bubbles (
PVC Compounds for Weather Resistant Applications - 1
2022 / 09 / 23
Flexible PVC is an inherently weather resistant material. Like all thermoplastics, however, it can be affected by weathering - a general term used to cover a wide range of outdoor environmental conditions. Various additives are available to improve a compound's weather resistance. Before selecting a compound and additives, it is important to fully consider the environment that will be surrounding the end product and the other desired physical properties of your application. Factors Influencing Weathering of Flexible PVC The following environmental factors should be considered when selecting a flexible PVC compound for your weather resistant application. Sunlight Temperature Moisture Wind Gases
PVC Compounds for Weather Resistant Applications - 2
2022 / 09 / 23
Moisture Rain and humidity are the two main contributors to moisture. Humidity keeps the material constantly moist, which can cause growth of bacteria as well as plasticizer leaching. Rain has a washing and impacting effect that could be detrimental to the material. Wind Wind is a carrier of particles such as dust, gases and moisture that can contribute to weathering effects on the material. Similarly, the absence of wind can allow the accumulation of air contaminants which could also contribute significantly to the weathering of a material. Gases In industrial areas especially, gases are present, possibly causing a chemical reaction with some materials which results in color changes or degradation. Location The geographical location i
PVC Compounds for Weather Resistant Applications - 3
2022 / 09 / 23
Fillers Flexible pvc compounds have excellent impact resistance. However, when the end use application will be used under extreme outdoor conditions, fillers are added to perfect surface gloss, mechanical profile properties, color, weathering properties, etc. Filler types include carbon black, aluminum hydroxide, talcum and calcium carbonate. UV Stabilizers UV stabilizers slow or stop the degradation process by reacting with radicals. The formulation of the stabilizer is specifically designed upon data about geographic location, weathering conditions, application type and expected life time. A well balanced incorporation into the compound is essential because the stabilizers can impair the flame resistant properties of a product. UV Light Absorbents Absorbents convert UV radiation into thermal energy which then disperses throughout the material. The performance of light absorbents alone is generally not sufficient for applications with extreme weathering conditions. Common types of UV light absorbents include:
PVC Compounds for Weather Resistant Applications - 4
2022 / 09 / 23
Antimicrobials These agents are added during the compounding process to prevent the growth of bacteria and fungus on products used in moist environments. Microbial growth can shorten the product life of plastic parts and can manifest itself as odor, discoloration, loss of properties, or loss of function. Weather Testing Weather testing helps ensure that materials and products meet their expected functionality and lifetime even in extreme weather conditions. The three main types of weather testing include: Natural Outdoor Testing This form exposes the material to sun and weather directly. Two benchmark climates are typically used for products sold in the US: Arizona (hot and dry) and Florida (hot and moist). Other sites can be used to simulate other climates. Natural outdoor testing usually isn't the most effective method due to time and logisti
Flexibility of CPVC in Manufacturing
2022 / 09 / 17
Flexibility of CPVC in Manufacturing CPVC is suitable for a variety of parts manufacturing processes, including extrusion, injection molding, thermoforming, and compression molding. CPVC parts can be fabricated into assemblies by a variety of options including solvent welding, hot plate welding, rod welding, and extrusion welding. CPVC provides a number of benefits over other materials in parts manufacturing. ✔ Mold shrinkage/appearance - Because it is a rigid amorphous thermoplastic, CPVC generally has much less mold shrinkage than many other materials and produces parts with a smoother glossier surface. ✔ Thermoforming - CPVC gives manufacturers the ability to extrude sheets and re-mold them into other shapes. ✔ Vacuum forming - CPVC can be extruded into sheets and vacuumed down into different molds, offering a fast and flexible solution to many applications, such as signage, trays and shells. ✔ Foaming for lightweight applications - Amorphous materials such as CPVC can be extruded as foamed material, for a variety of lightweight applications. Polystyrene-like packaging can be manufactured and used with the inherent fire repellent properties of CPVC. ✔ Weldability - CPVC can be welded with solvents or with a variety of common welding techniques including hot-plate welding, rod welding, and extrusion welding. ✔ Recycling - CPVC can be reheated and remoulded after initial processing, minimising wastage in the manufacturing process. Finding flexibility in material engineering not only saves valuable time and energy for manufacturers, it boosts the potential of any product portfolio, adding another layer of strength, stability or safety to a product that most polymers simply cannot achieve.
Flexibility of CPVC Compounds in china
2022 / 09 / 17
CPVC resins require compounding with a variety of additives in order to make them processable into parts. These additives can take a number of forms:Heat stabilizers - to protect the polymer during high-temperature processingUV stabilizers - to protect the polymer for outdoor applicationsImpact modifiers - to improve durability and strengthProcessing aids and lubricants - to assist with the formation of productsPigments - to achieve desired plastic colourThe following characteristics can be scaled up or down depending on the quantity of additive in the material compound. It is worth keeping in mind that there is always a balance to be addressed, between the inherent strengths of CPVC and desired additive effect.Tensile strengthHeat distortion temperatureLong term creep performanceFlame & smoke performanceImpact strengthDuctilityProcessability
Flexibility of CPVC Resin in china
2022 / 09 / 17
Flexibility of CPVC ResinCPVC resin is created through chlorination of the PVC molecular chain. Chlorine atoms surround the chain, stiffening the carbon backbone and driving the softening temperature higher. CPVC resin, when specified for material compounds provide a number of advantages:Heat resistanceFire and smoke characteristicsUV resistanceResistance to corrosionWeatherabilityEnvironmental benefits Resins can be created at varying molecular weights and chlorine contents which can vary its properties. Varying molecular weight allows for a range of mechanical strength, while varying chlorine content allows for a range of heat and fire resistance. The range of grades available makes CPVC adaptable to a variety of parts manufacturing processes, including extrusion, injection molding, thermoforming, and compression molding.
[Vietnam Customs Authorities] Decree No. 111/2021/ND-CP on goods labels
2022 / 09 / 17
[Vietnam Customs Authorities] Decree No. 111/2021/ND-CP dated December 09, 2021 on amendments to some articles of Government`s Decree 43/2017/ND-CP on goods labels According to article 10 in the Decree from Vietnam customs document No. 111/2021/ND-CP, the following information on the original label of goods imported into Vietnam must be written in Vietnamese or foreign language while following customs clearance procedures: a) Name of the goods; b) origin of the goods; In case of unknown origin of goods, the country from which the last stage of finishing the goods is performed; c) The name or abbreviated name of the manufacturer or the entity responsible for the goods in the foreign country;
Why should work sites use recycled PVC for materials?
2022 / 09 / 17
The use of plastics in street and road works is often unavoidable, with durable materials required to keep the public and workforce safe. Traditionally, plastic has been a top choice for products use in street works, construction sites and events due to its durability and realiability. As pressure rises to reduce our impact on the environment, finding the most sustainable product is high on the agenda for many site mangers. What is recycled PVC? In many of plastics products, recycled PVC is material from discarded or semi-finished PVC items. Rather than send this material to landfill, it is instead used within a new product. As restrictions around plastic usage rise, with many pushing for increased traceability and a circular economy, recycled PVC can ensure sites are both compliant and environmentally friendly. PVC`s advanced mechanical recycling properties, combined with the large volumes of waste available, make it a well-suited material for work site products. Recycled PVC production saves up to 90% more energy than virgin PVC production, preventing a substantial amount of greenhouse gases, contributing to the preservation of natural resources and reducing landfill volumes of PVC.
2022 / 09 / 17
Beginning in the 1990s, the additive brominated flame retardant HBCD has gradually been used in building insulation materials throughout the world, and its usage has gradually increased. However, international studies have found that HBCD itself is toxic and has the potential for long-distance environmental migration, which can affect the regional and global environment through air, water or migratory species. The "Stockholm Convention on Persistent Organic Pollutants" is the third international convention with mandatory requirements adopted by human society to protect the global environment after the "Convention for the Protection of the Ozone Layer" and the "Framework Convention on Climate Change." China joined the Convention in 2001 and, as the first signatory, has taken vigorous actions to protect human health and the environment from persistent organic pollutants (POPs). In May 2013, the parties agreed to list HBCD as a newly listed POPs in Annex A of the Stockholm Convention on Persistent Organic Pollutants and take actions to ban or eliminate them globally. From December 26, 2016, China banned the production, use, import and export of HBCD. Among them, HBCD used for building insulation materials EPS (expanded polystyrene) and XPS (extruded styrene) has a 5-year exemption period, which will end on December 25, 2021. Novista Group supplies SR13
How To Test The Flame Retardant Effect Of Flame Retardant Fabrics?
2022 / 09 / 17
At present, the flame retardant effect test methods of flame retardant fabrics mainly include the following: Limiting oxygen index (LOI) method: LOI refers to the minimum oxygen concentration required to maintain the candle-like burning of the fabric when combustion occurs in a mixture of oxygen and nitrogen. The larger the limiting oxygen index, the better the flame retardant effect of the fabric. This method is suitable as a test method in scientific research and is not often used in the production of flame-retardant fabrics. Vertical combustion method: refers to the use of a specific ignition source (flame height 40mm) to burn the vertical fabric fixed in the U-shaped clamp at the center 20mm away from the bottom edge of the fabric, and pass the inspection of the fabric within the specified burning time. A method to test the flame retardant properties of flame-retardant fabrics by indicators such as burning state, continued burning time, smoldering time, and damage length. The vertical combustion method is widely used in the flame retardant test of flame retardant fabrics in most countries. 45° inclined plane combust
What Are Advantages Of Functional Flame Retardant Masterbatch?
2022 / 09 / 17
1. High flame-retardant efficiency Flame-retardant masterbatch is based on a reasonable formula, through the organic combination of flame retardant, lubricating dispersant and carrier, after mixing and mixing uniformly, it is extruded and granulated. After being mixed with plastics, they are more dense and uniform; Meanwhile, the flame-retardant masterbatch contains a dispersant and high melting index carrier, which means it will be dispersed better, so that every flame-retardant molecule can exert the flame-retardant effect, thereby improving fire resistance efficiency. 2. Diversified functions The main feature of flame-retardant masterbatch is the functionalization of flame-retardant masterbatch. With the advancement of science and technology, equipment and materials are constantly improving, and the functionali
Glass Fiber Reinforced Flame Retardant Nylon Application
2022 / 09 / 03
In nylon with glass fiber, after modification of nylon mechanical properties, dimensional stability, heat resistance, aging resistance, resistance to fatigue strength is not increased 2.5 times, add flame retardant after filling, achieve UL94V0 flame retardant grade, in auto parts, electronic appliances, engineering machinery parts, textile, etc widely used. Properties and characteristics of glass fiber flame retardant nylon -Glass fiber flame retardant nylon reduce water absorption, with high tensile strength, stable product size stability. -Commission modified nylon flame retardant level, with self-extinguishing, to adapt to the high temperature requirements of electronics, electrical, communication and other industries. -Improve the mechanical strength of modified nylon toughness resistance, impact resistance, to achieve the strength of metal materials, replace metal.
4 Types Of Flame Retardant Plastic Additives
2022 / 09 / 03
Therefore it is often necessary to add flame retardant plastic additives to meet governmental and industry regulatory standards. Flame retardant plastic additives are compounds added to plastics and other materials to inhibit, suppress or delay combustion. These compounds are useful in impending burning in the ignition phase of fire. They do not prevent charring or melting nor do they increase the heat resistance of a material. Flame retardants are also not effective when a fire is fully engaged. There is no universal additive for all plastics, rather each flame retardant is specific to a particular polymer and a particular flammability test. To understand how flame retardants work, it is necessary to understand how materials burn. When we see the flame of a burning object, we are actually seeing the combustion of flammable gases given off during its thermal decomposition. This process is call pyrolysis. Pyrolysis is the process in which the long-chain molecules of a polymer chain degrade into smaller hydrocarbon molecules and flammable gases. These gases mix with oxygen and exothermic chemical reactions occur producing free radicals (H and OH). In complete combustion, H2O and Co2 are produced as well as other material specific gases. The way that flame retardants interfere in the pyrolysis of a polymer depends on the flame retardant(s) used and the plastic burned. Flame retardants can be either active or reactive. Active means blended into a polymer and reactive means inserted in the polymer molecule. Both types can suppress ign
World Bromine Resources Distribution And Flame Retardant
2022 / 09 / 03
Bromine is an important chemical raw material, widely used in flame retardants, fire extinguishing agents, refrigerants, photosensitive materials, medicine, pesticides, oil fields and other industries. The natural resources of bromine mainly exist in seawater, underground concentrated brines, sediments of ancient oceans and salt lake water. Bromine content in sea water accounts for 99% of the total global resources, the concentration of bromine is about 65ppm, while salt mine is only 0.1ppm, some areas 200~300ppm (such as underground brine in Laizhou, Shandong Province,China), in some foreign salt lake water 2000 to 12000 ppm The world production of bromine is about 800,000 tons/year. Among them, the annual output of the United States and Israel is more than 550,000 tons, ranking first and second in the world. China's annual output is about 160,000 tons, ranking third. Jordan and Japan are the fourth and fifth largest bromine producers in the world, with small quantities in Ukraine, Azerbaijan, India, Germany, Spain and Turkmenistan. Novista Group supplies DBDPE, BDDP, FR245, TTBP,SR130 to global market.
Fire Protection Effect Of Intumescent Steel Structure Fireproof Coating On Steel
2022 / 08 / 27
Barrier function. The high-expansion carbonized layer can effectively isolate the protected steel structure from air and heat sources, thereby effectively reducing the surface temperature of the steel structure and prolonging the support time of the steel structure in a fire. The heat absorption, softening, melting and expansion of the polymer coating, the physical change of the carbonized layer and the thermal decomposition, evaporation and carbonization of the coating components will absorb a lot of heat, thereby effectively reducing the surface temperature of the steel structure. Suspend combustion. Various incombustible gases decomposed by thermal decomposition of coating components can dilute the oxygen concentration and capture free radicals generated by combustion, thereby effectively preventing combustion. The coordination of these three processes finally makes the intumescent steel structure fireproof coating play an effective fireproof role. Novista Group supplies APP, MCA, aluminium hydroxide,magnesium hydroxide to global market.
The Development Prospect And Direction of PP Plastic Flame Retardant
2022 / 08 / 27
The development prospect and development direction of PP plastic flame retardant is a new type of reactive flame retardant containing Br (bromine), P (phosphorus) N (nitrogen) and other elements. Brominated flame retardant Most brominated flame retardants will decompose at 200-300 ℃, this temperature range is also the decomposition temperature range of polypropylene, so when polypropylene is thermally decomposed, brominated flame retardants also begin to decompose, and can capture its The free radicals generated by the degradation reaction, thereby delaying or terminating the combustion chain reaction. At the same time, the released HBr itself is a refractory gas. This gas has a high density and can cover the surface of the material, which can block the flammable gas on the surface and inhibit the combustion of the material. The main disadvantage of brominated flame retardants is that they reduce the anti-ultraviolet stability of the flame-retardant substrate, and generate more smoke, corrosive gases and toxic gases during combustion, which limits their application.
Knowledge Of The Use Of Flame Retardants
2022 / 08 / 27
In general, the flame retardant mechanisms of bromine and chlorine systems are similar. At high temperature, the carbon-halogen bond in halogen-based flame retardants will be damaged, releasing halogen free radicals, which can effectively capture free active free radicals generated by thermal degradation of polymer materials, and can effectively reduce the concentration of free radicals, thereby alleviating or stopping burning free radical chain reaction. In addition, because the released hydrogen halide is not easy to burn, halogen-based flame retardants can effectively block oxygen and suppress the burning reaction. However, when a polymer material containing a halogen flame retardant is incinerated, a large amount of hydrogen halide gas is generated. This gas is toxic and corrosive. At the same time, it also simply absorbs moisture in the air, forming a highly corrosive hydrogen halide acid, along with a lot of smoke. These fumes, toxic gases and corrosive gases will damage human health and bring great obstacles to life-saving, escape and recovery. Flame retardant manufacturers: treated aluminum hydroxide flame retardant aluminum hydroxide, also known as trihydrate oxidation Aluminum (ATH), with the molecular formula Al(OH)3, is one of the earliest inorgani
The main difference between CPVC and PVC
2022 / 08 / 20
The main difference between CPVC and PVC is the range of temperatures each is capable of withstanding. CPVC can handle temperatures up to 200° Fahrenheit, while PVC peaks at 140° Fahrenheit. Above those temperatures, both CPVC and PVC will begin to soften, increasing the risk of joints and pipes failing, and therefore, failing of the plumbing system. The primers, solvent cements, and bonding agents are different for PVC and CPVC due to the differences in the material's chemical composition. For example, CPVC solvent cements must meet ASTM F493 specifications, and PVC solvent cements must meet ASTM D2564 specifications. Because of this, CPVC and PVC pipes and fittings, along with their solvents and bonding agents, should not be used interchangeably. In addition to meeting ASTM specifications, there are different solvent cements required based on the pipe`s size and intended application, so check the product containers to be sure you`re using the correct agent for the correct application. PVC comes in nominal pipe sizes only, while CPVC is available in both nominal pipe sizes and copper tube sizes. CPVC has greater flexibility than PVC, and requires support at three foot intervals to maintain its position. Characteristics and Properties CPVC AND PVC VISUAL SIMILARITIES AND DIFFERENCES PVC pipes are white or dark gray in color. CPVC is off-white, light gray, or yellow in color. Both pipe types have technical specifications printed on the side for easy verification. Both pipe types are available in plain end and bell end. Both come in Schedule 40 and Schedule 80 thickness. Schedule 40 PVC also comes in Class 125 fittings. PVC is available in 10 ft and 20 ft lengths. CPVC is available in 10 ft and 20 ft lengths. Certain diameters of PVC pipe and furniture PVC pipe are now available in 5 ft sections. CPVC AND PVC PROPERTIES Bot
2022 / 08 / 20
1. By improving adhesion in the first step of fusionS-PVC grain (secondary particle) of size 90-250 micron has a hard skin of 0.2 – 1.0 micron. This hard skin makes fusion very difficult. Unless this skin breaks, dispersion of secondary particle to primary particle and in turn fusion cannot take place effectively.During extrusion, some degree of adhesion is necessary to facilitate shearing and convey the material along the flights of the screw.In the initial stages of fusion, PVC tends to exhibit reduced adhesion to it and to metal surfaces.This delays heating and breakdown of the grains.Process aids do not have hard skin like PVC. Due to this reason, when heated under shear and stress, process aids soften earlier than PVC and then adhere to the surrounding PVC particles. Owing to good compatibility with PVC, they transmit elongational and shearing forces to PVC grains.In this way process aids work as shear transfer agents, resulting in faster and uniform breakdown of PVC grains to primary particles (dispersion), leading to faster and uniform fusion.Generally, lower the molecular weight of process aid, lower is the temperature of onset of fusion.2. By providing longer chains to entangle with PVC chains in the second stage of fusion:Acrylic processing aids have very good compatibility with PVC because of their main component PMMA.They also have higher molecular weight and longer chains than PVC.Thus, when heated under shear stress during processing, entanglement appear between PVC chains and process aid chains resulting in viscoelastic network.These entanglements work as cross links during processing and add rubbery characteristics to PVC compounds enabling increase in drawdown for extrudate or blow up ratio for blown films.Process aid chains are elastic at processing temperature. Their action depends u
Selection of molecular weight of process aids
2022 / 08 / 20
Improves jetting or gate blush and weld line in injection molded productsEliminates distortion in rolling bank and flow marks in calendaring process, andImproves appearance of PVC foamed products (very high mole weight process aids.)PA that adds lubricity are- Low molecular weight MMA copolymers or acrylic polymers. It can be considered as acrylic waxes.These process aids consist of PVC compatible part and PVC incompatible part.Effect of lubricating acrylic process aids:Improves metal releasePrevents plate out, andAre neutral to fusionSAN based process aids:They are based on Poly (styrene – Acrylonitrile)They have higher molecular weight and viscosity than acrylic process aids.They are relatively cheaper.They offer higher surface gloss in opaque products.And, they do not affect VST. Copolymer of styrene – MMA, on the other hand has high molecular weight and high glass transition temp than PVC. Some researchers recommend blend of Acrylic and SAN based processing aids for UPVC injection moulding. 8. Cooling and Solidification Stage Working component: water bath, cooling fan The extruded product is quickly cooled and solidified by the cooling system to maintain its shape and dimensional stability. Cooling methods include water bath cooling, air cooling, etc. 9. Cutting and Post-processing Stage After the cooling stage, the solidified plastic can be further processed, especially in plastic modification applications. At this stage, precision becomes cr
Flame retardant for Transportation industry
2022 / 08 / 20
Preventing fires and extending escape time are of utmost importance when people are in a confined and not easily vacated space. From airplanes to cars to trains, flame retardants can play a key role in protecting travelers from the devastation of fire. After the July 2013 Asiana Airline crash in San Francisco, for example, experts credited flame retardant materials with helping passengers survive the crash. Former FAA Director Steven Wallace told the New York Times that flame retardant materials inside the plane, including foil wrapping under the seats, most likely helped protect many passengers. Novista Group supplies APP, MCA, aluminium hydroxide,magnesium hydroxide to global market.
BROMINATED FLAME RETARDANTS: ESSENTIAL USE AND SUSTAINABILITY
2022 / 08 / 20
· The use of plastics in durable goods will continue to rise, and fire safety is an expectation of society important to preserve. · Flame retardants are critical chemistries that help protect plastic components used in the modern built environment. · Brominated polymers provide unique and versatile fire safety solutions. · · NOTE: Chlorinated, fluorinated, phosphorous, and mineral based flame retardants are different in terms of how they work; they are not direct substitutes for brominated flame retardants. · · Novista Group supplies equivalent of FP-2100JC, FP-2200S, FP-2500S, Exolit OP1230, OP930, OP1312, OP1314 to global market.
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Mobile Phone:+8615336365800
Email:manager.han@novistagroup.com
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