装修中，常听工人说4分管、6分管，自己却不知道是什么意思？其实这指的是管子的外径，ppr管件规格，4分管外径20mm，ppr管材管件，6分管外径25mm。选择哪种管，要看水管的外径来决定。管4分管，只能使用4分管。管是6分管，使用6分管、4分管都可以。另外，水管上也会标注20*2.8、25*4.2，淮安ppr管件，前面的20、25就是指管子外径，而后面的2.8、4.2则指水管的壁厚。一般管壁越厚，ppr管件品牌，水管就越耐用。
Parameters of PPR tube
Decoration， often listen to workers say 4 in charge， 6 in charge， but do not know what it means? In fact， this refers to the outer diameter of the pipe. The outer diameter of 4 branch pipes is 20 mm， and that of 6 branch pipes is 25 mm. Which kind of pipe to choose depends on the outer diameter of the pipe. Only four branches can be used. The management is divided into 6 branches. It is OK to use 6 branches or 4 branches. In addition， 20 * 2.8 and 25 * 4.2 will also be marked on the water pipe. The front 20 and 25 refer to the outer diameter of the pipe， while the back 2.8 and 4.2 refer to the wall thickness of the water pipe. Generally， the thicker the pipe wall is， the more durable the water pipe is.
同种规格的PPR热水管壁厚要比冷水管的厚，简单举例：D25×2.3 D25×2.8 D25×3.5 D25×4.2 这里列举的是外径为25MM的PPR管所对应的四种不同规格，前面两种为冷水管，后面两种为热水管，因此可以非常明显的看出，冷水管的壁厚要小于热水管。
The wall thickness of PPR hot water pipe of the same specification is thicker than that of cold water pipe. Simple example: D25 × 2.3 D25 × 2.8 D25 × 3.5 D25 × 4.2 here are four different norms of PPR pipe with outer diameter of 25 mm. The first two are cold water pipes and the latter two are hot water pipes. Therefore， it is very clear that the wall thickness of cold water pipe is ***aller than that of hot water pipe.
PPR管材料的耐水性用软化维卡系数表示。在采暖、高温热水、明敷安装、户外给排水管道应用中耐水性材料的软化维卡系数具有明显的优势。软化系数的大小，表明材料浸水后强度降低的程度，一般波动在0-1之间。软化系数越小，说明材料吸水饱和后的强度降低越多，所以其耐水性越差。对于经常位于水中或受潮严重的重要结构物的材料，其软化系数不宜小于。受潮较轻的或次要结构物的材料，其软化系数不宜小于0.75。软化系数大于0.80的材料，通常可以认为是耐水的材料。
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