First, flame retardant modified materials
As we all know, traditional materials generally choose to use nitrogen and phosphorus modified materials as a flame retardant. In doing so, red phosphorus will interfere with the plastic coloring in the hue, the use of red phosphorus can only achieve black or red.In addition, its side effects will affect the processing, It is also highly corrosive for use in hot and humid environments.
In addition, most of the commonly used inorganic flame retardants are based on aluminum and magnesium hydroxides, and the relatively high dosage is not only seriously limiting the processing performance of plastics-especially injection molding, but also affecting the production of parts and components Mechanical properties.And the main representative of nitrogen-based flame retardants - melamine cyanurate, can only be used for unfilled polyamide.
Plastic insulation to meet the increasing demand of manufacturers, but when the thin plastic film wall thickness, whether it has high dielectric strength need to be confirmed. Usually manufacturers will be miniaturized and highly functional integration to achieve less Weight and cost reduction The corresponding melt flow index also needs to be realized and guaranteed due to the high requirements associated with the structural shape and thinner and thickest layers.
In addition to 'traditional' flame retardant materials based on halogen, red phosphorus and melamine or their blends, many materials companies have developed halogen-free non-traditional flame retardant systems that also have higher mechanical and Electrical properties.
Halogen-free flame retardant plastic products with almost no precipitation of flame retardant surface phenomenon, because they do not contain any reaction at low temperatures that the material, so compared with unprotected materials, the process parameters are very similar.
Second, halogen-free engineering plastics
More and more companies nowadays replace halogenated materials with new materials that contain modern flame retardants and are actively developing and utilizing halogen-free materials for existing and new components whose mechanical and electrical properties are at least as high as conventional materials Fire retardant performance indicators, the operation must be efficient.
In addition, the quantity requirements for certain materials also vary dramatically: Some color-specific components require fewer operations, monthly material requirements are measured in kilograms, while the standard requirements for high-volume processed materials are Tons of tons. Supply is guaranteed in all circumstances - and must meet the certification requirements for many years.
'Electronic products are demanding and high performance, but sometimes very tight tolerances are required for complex geometries, and the trade-off between the two requires some flexibility.' Halogen-free flame-retardant plastics are as good as conventional high-temperature or standard flame-retardant materials Can better meet the requirements of safety, strength, design, etc. Simple operation can be replaced, and standard polyamides with different glass fiber contents are cheaper, all of which can reduce the cost.
Third, fire standards
In addition to the DIN standard, halogen-free engineering plastics are tested in accordance with the requirements of the United States Safety Monitoring Laboratory Company (UL), a certification body for electrical and technical products in the United States that tests plastic products in parts of different thicknesses V-0 corresponds to the highest fire rating and V-1 and V-2 correspond to relatively low requirements.
In addition, the European standard IEC 60335 is required, which specifies the safety requirements for low-voltage 'household and similar low-voltage electrical appliances'. The submitted documents must be informative, such as the dielectric strength and mechanical properties of the equipment.