Good mechanical strength and significant safety

The main characteristics of the new generation of flame retardants are low load, high efficiency, and halogen-free. Currently, flame retardants based on metal phosphates are available on the market under the brand exolitop (manufacturer: Klein)

Frisetta, headquartered in Shona, Germany, has confirmed the advantages of the new product through testing. This small and medium-sized enterprise is located in the southern part of Black Forest and is a leading manufacturer of high-quality polyamide particles primarily used in the electronics and automotive industries. Exolitop flame retardant can be used for polyamide (PA6 or PA66) glass fiber reinforced material FRIANYL, and comprehensive tests have been conducted.

In addition to its highly effective flame retardant performance, its mechanical and electrical properties are also excellent (anti leakage trace index CTI>500V). Figure 2 shows the changes in mechanical properties of glass fiber reinforced nylon 66 composite material. Compared with standard compounds, compounds containing exolide have slightly higher e-modulus, lower growth rate, and similar impact strength.

Halogen free products also have excellent thermal stability (up to 350 ℃) and can undergo solid-phase reactions when ignited. This means that the smoke density can be reduced and no other corrosive gases will be produced. By forming a partially foamed outer layer, the heat dissipation rate is also very low. Even if the wall thickness is only 0.75mm, compounds containing plagioclase can easily reach ul94 v0.

Polyamide compounds containing hypophosphite also achieved excellent test results in key glow filament tests. The combustion index of the glow filament is 960 ℃. Glow filament ignition temperature (GWIT) is a special test standard for plastic components in household appliances. The compound also meets the requirement of 775 ℃.

Non toxic physical issues

Products based on hypophosphoric acid have impressive low fluidity and permeability, meeting all important toxicological requirements.

This product has minimal impact on organic matter (fish, water fleas, bacteria, algae) in water and does not require specialized identification and classification. Even if hypophosphoric acid is absorbed by the body, this substance will be quickly excreted from the body without accumulating inside. Like most plastic additives, sodium hypophosphate has relatively stable chemical and biological properties and is not easily degraded.

ecological footprint 

The Fraunhofer Umscht Institute conducted a comprehensive evaluation of the environmental compatibility of these products in a research project. Analyzed the formation of emissions, volatile organic compounds, leaching resistance, and toxicity of combustion products during the combustion process. Here are only a few important points listed. Considering all these characteristics, exolitop can achieve a very high ranking, not just compared to traditional flame retardants. Exolitop meets all known ecological standards. Especially when equipment manufacturers face the challenge of restricting the use of halogenated flame retardants, this product has significant advantages.

Another study confirmed the renewability of compounds containing hypophosphite. This series of experiments is based on UL standards and uses composite materials (polyamide PA, polybutylene terephthalate PBT). The experimental results show that after 6 rounds of re granulation, the refractory performance of the sample can reach ul94 v0 and maintain good mechanical properties. Therefore, production waste can be easily reprocessed.

As a future oriented system, the product complies with the newer EU directives "Directive on Scrap Electrical and Electronic Equipment" (WEEE, 2002/96/EC) and "Directive on Restricting the Use of Certain Hazardous Substances in Electrical and Electronic Equipment" (RoHS, 2002/95/EC). The latter prohibits the use of lead in printed circuit boards (PWBs), resulting in a soldering operating temperature that is about 30 ℃ higher than traditional processing methods. Therefore, both polymers and necessary flame retardants require good thermal stability. Formulas containing hypophosphoric acid will not blister or fade even at high temperatures, which means that halogen-free printed circuit boards with high glass transition temperatures can be produced.

Replacing traditional systems

Considering all aspects of the product, the hypophosphite flame retardant system is a perfect substitute for traditional flame retardant systems. The results here clearly demonstrate the advantages of this new material. Improve electrical performance, increase coloring freedom, have good mechanical performance, easy processing, high cost-effectiveness, good renewability, and ecological benefits.