As we all know, the strength of composite board products, especially the tensile strength, is very important to resist wind pressure. But for the application of composite board in the field of building insulation, there is a wrong thinking in the market. Taking the external wall insulation system as an example, the mechanical strength of high-density composite board products is bound to be better. To improve the mechanical strength, it is necessary to improve the density of composite board materials.

因此，在我国许多地方技术法规或标准中，都对外墙外保温系统中使用的复合板提出了密度要求，但过高的密度会导致导热系数的增加，从而削弱济南复合板的保温性能，给施工和安装带来不便。

Therefore, in many local technical regulations or standards of our country, the density requirements of composite board used in external thermal insulation system are put forward, but too high density will lead to the increase of thermal conductivity, which will weaken the thermal insulation performance of Jinan composite board and bring inconvenience to construction and installation.

事实上，在欧洲市场上已经出现了解决这个问题的方案，并且有成熟的应用经验，不仅可以保证较高的机械强度和较低的导热系数，还可以降低复合板的综合密度。

In fact, solutions to this problem have appeared in the European market, and have mature application experience, which can not only ensure higher mechanical strength and lower thermal conductivity, but also reduce the comprehensive density of composite board.

复合板产品在已有几十年的发展历史。由于近年来建筑和工业领域火灾频发，作为一种防火性能优异的A类保温材料-复合板，受到各界人士的高度重视和推崇行业。众所周知，导热系数和密度是保温材料测试项目中非常重要的测试指标。导热系数是衡量材料热性能的指标，而密度指数是衡量保温材料是否在技术要求范围内的较好指标。

Composite board products have developed for decades in China. In recent years, due to the frequent fire in the construction and industrial fields, as a kind of class a insulation material with excellent fire performance, composite board is highly valued and respected by people from all walks of life. As we all know, thermal conductivity and density are very important test indexes in the thermal insulation material test project. Thermal conductivity is an index to measure the thermal performance of materials, while density index is a better index to measure whether the thermal insulation materials are within the technical requirements.

对于纤维材料，导热系数的变化与纤维的直径、方向排列和密度有关产品。当纤维的直径和排列不变时，济南复合板产品的密度过低或过高，对保温或隔热功能的贡献不明显，其密度分布范围一般为80-100kg/m，从隔热的角度来看。

For fiber materials, the change of thermal conductivity is related to the diameter, orientation and density of fibers. When the fiber diameter and arrangement remain unchanged, the density of Jinan composite board is too low or too high, and its contribution to the heat preservation or heat insulation function is not obvious. The density distribution range is generally 80-100kg / m, from the perspective of heat insulation.

对于不同的系统应用，在选择复合板材料或开发复合板产品时可以遵循一些基本原则：在满足使用要求(如强度、防火安 全等)的前提下。导热系数要尽量降低，密度要在合理的范围内。

For different system applications, some basic principles can be followed when selecting composite board materials or developing composite board products: on the premise of meeting the use requirements (such as strength, fire safety, etc.). The thermal conductivity should be reduced as far as possible and the density should be in a reasonable range.