Key points of formula design for PVC cable compound

Key points of formula design for PVC cable compound

There are many applications of magnesium hydroxide such as water treatment, building material, cable industry. And KMT Industrial has put a lot of effort into developing magnesium hydroxide as a flame retardant in the cable industry. For example, we have Brucite (the mineral form of magnesium hydroxide) B3.5SA for PVC compound. Precipitated magnesium hydroxide PM5SN for halogen-free flame retardant cable compound, and we recently developed a new grade PM3SL for HFFR compound which costs less compared with PM5SN (Because this passage is about PVC compound, so for more information related to PM3SL, PM5SN, you can contact me).

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During our promotion and testing of magnesium hydroxide. We also received a lot of questions from our customers who manufacture PVC compounds. And most of the questions are related to the formula of PVC compound. So today I would like to share some key points of formula design for PVC cable compound. Hope you enjoy it.

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Before we jump into the key points of formula design, let‘s figure out what are those materials in the PVC compound formula first of all. PVC cable compound is made of polyvinyl chloride as the basic resin, adding stabilizers, lubricants, and inorganic fillers, etc., through mixing, kneading, and extrusion process. So the points of PVC formula design are mainly about the choosing of PVC resin, stabilizers, lubricants, and inorganic fillers these materials. Now let’s move on to key points of formula design for PVC cable compound.

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1. For general sheath grade PVC cable compound. The amount of plasticizer is 0~60PHR, the stabilizer is 6~8PHR, the lubricant is 1.5~2PHR, and the filler is 10~20PHR.

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If the plasticizer is with poor plasticizing efficiency, the amount should be added. 

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When the amount of filler is large, the amount of plasticizer and lubricant shall be larger.

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When using inactive fillers, the amount of plasticizer and lubricant should be larger, and the sheath-level cable compound should generally be added with a 5PHR cold-resistant plasticizer.

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  • For general insulation cable compound, The amount of plasticizer is 40~50PHR, the stabilizer is 6~8PHR, the lubricant is 1~1.5PHR, and the filler is 10PHR.
  • DBP with large volatile can not be used for cable material.
  • For a high-temperature resistance cable compound, except using a high-temperature resistance plasticizer, the amount of plasticizer shall also be increased, and add 0.3~0.5PHR antioxidant.
  • For cable materials that require high insulation performance. Fillers such as calcined clay should be used (high polymer plasticizers have poor plasticization efficiency. The number of plasticizers should be increased as appropriate when formulating the formula).
  • When formulation a transparent compound, plasticizers with good compatibility with the resin should be used. Such as transparent stabilizers organotin, but the amount of lubricant added should be strictly controlled;
  • When designing the flame-retardant cable material formula. It is advisable to choose a composite flame retardant system;
  • When formulating a high polymerization degree cable compound, we can use compound processing modifiers to improve its processing performance;
  • When formulating a non-migrating compound, you should choose polyester or high molecular polymer plasticizers

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  1. When selecting a compound stabilizer, its dosage is slightly more than that of stabilizers such as tribasic;
  1. Under the condition that the cable material is processed and used normally. We should minimize the amount of stabilizer to prevent the excessive amount of it and cause the “filler effect”.

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That’s all for today’s feed, please feel free to contact me (Elena: kmt_elena@163.com) if you have any suggestion or you have any thoughts about this passage. Thank you for you time.

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