Hengtai Ready-to-use Foam

It has a unique micro-closed honeycomb structure, which has higher density and higher compression performance than EPS board. Because XPS board has low long-term water absorption rate, it is especially suitable for inverted roof and air-conditioning duct.033～0. 2.

Under long-term high humidity or water immersion environment, XPS board can still maintain its excellent thermal insulation performance. When used for exteal wall and roof insulation, there is generally no obvious moisture problem.036W/(m·K); the density is less than 15 kg/ When m, the thermal conductivity increases sharply with the decrease of density; EPS boards with a density of 15-22 kg/m are suitable for exteal insulation. , Low thermal conductivity, low water absorption, low water vapor permeability, etc.

However, when one side of the EPS board is in a high temperature and high humidity environment for a long time, and the other side is in a low temperature environment and is sealed by materials with poor water vapor permeability; or when the roof waterproof layer fails, the EPS board may be severely damp, resulting in its thermal insulation performance Severe reduction. Among various commonly used thermal insulation materials, it is currently the only Insulation material whose thermal resistance retention rate is still above 80% after two years under 70% relative humidity. It can support the protective layer of the surface by its own strength, and it does not need pull parts to avoid the formation of thermal bridges.

Light weight, and has certain Wholesale China cascell manufacturers compressive and tensile strength. High temperature resistant foam also has good frost resistance Melting performance and better compression creep resistance.High temperature resistant foam'>The design points of high temperature resistant foam: 1. EPS The thermal conductivity of the board is the smallest in the density range of 30-50 kg/m; when the average temperature is 10℃ and the density is 20kg/m, the thermal conductivity is 0.

High temperature resistant foam, PMI foam, core material foam Process of PMI foam sandwich structure. Performance advantages of PMI foam packaging. When used in cold storage, air conditioning and other low-temperature pipe insulation, a vapor barrier must be provided on the outer surface of the EPS board

Core material foam plastic'>The core material foam plastic has two types: hard and soft. A relatively normal foam is generated inside, but no bubbles or few bubbles are generated on the surface part. Quality foam plastic means that at room temperature, the polymer constituting the foam plastic is crystalline or amorphous, and their glass transition temperature is higher than normal temperature, so the texture of foam plastic is relatively hard at room temperature. According to the foam density method, it can be divided into high, medium, low and Ultra-low-density foams and self-

skinned foams with large density differences are also called whole skin foams.5 cm, if it does not break, the test sample is soft High-quality foam; on the contrary, it is a rigid foam. Usually, the foaming ratio is less than 5 is called low foaming, and the foaming ratio is greater than 5 is called high foaming. A dense skin layer with a much higher density than the inteal foam is formed on the outer surface of the foam. Advantages and application of core material foam plastic.

At a temperature of 18 to 29 ℃, within 5 seconds, around a round bar with a diameter of 2. A very obvious change. For example, according to the processing method, it can be roughly divided into two-step method, semi-prepolymer method, one-step method and spray method. There are many classifications of polyurethane foam. There is a density drop gradient from the skin to the center of the core.

Soft foam plastic constitutes foam plastic The melting point of the polymer is lower than normal temperature, or the glass transition temperature of amorphous polymer is lower than normal temperature, structural foam and the material is soft at normal temperature; semi-rigid or semi-flexible foam is a foam between the above two types.

Core material foam, PMI foam, high temperature resistant foam Reinforcement method of carbon fiber sandwich foam. The latter is a special foam form, which does not have the same density as the previous foams. Foams can be divided into two types: low foaming and high foaming.The interconnected micropores are called open-cell foams, and the closed-cell foams are called closed-cell foams