Q:What are the exterior wall thermal insulation materials?

Organic thermal insulation material:Such as rice straw, rice husk, sugarcane fiber, softwood, kapok, sawdust, wood shavings, wood fiber and their products.Advantages: this kind of material has a small volume, a wide range of sources, most of the low price, but the moisture absorption is large, easy to decay after damp, and easy to decompose or burn at high temperature.

Q:How can the exhaust pipe of a gas water heater be insulated by going through the glass?

Gas water heater exhaust pipe are now dual structure: the inner tube is the exhaust pipe, the fan will strong combustion exhaust water heater forcibly discharges the indoor air inlet pipe; the outer tube is, the outer air (oxygen) gas suction water heater for combustion.

Q:What are the common thermal insulation materials?

Main use of mineral cotton: its products are mainly used in the walls of dry buildings, roof, ceiling and other insulation, insulation and sound absorption, but also made of waterproof felt and pipe sleeve.

Q:Is the calorimeter for building materials calorific value?

Calorific value calorimeter for building materials is used to determine the calorific value of building combustible materials such as stone, wood, concrete, and even dispersed mineral wool and polymers.In the standard set / group under the condition of oxygen nitrogen calorimeter specimen is placed in a certain quality of a constant volume, in order to test the temperature rise test as the foundation, considering all the heat loss and latent heat of vaporization, heat of combustion calculation sample.

Q:What are the requirements for floor and exterior wall waterproofing in building construction?

The joining of different structural materials shall be made of salt resistant fiberglass mesh or hot galvanized galvanized wire mesh of not less than 150mm on each side for anti cracking strengthening treatment

Q:What are the properties of fire-resistant coatings for steel structures?

Thick steel structure fire retardant coating refers to the steel structure fireproof coating with coating thickness greater than 7 mm, less than or equal to 50 mm, granular surface, little density, low thermal conductivity, and refractory limit of 2 h or more. Because of the thick fire retardant coating composition for inorganic materials, so the fire performance is stable, long-term effect is good, but the coating components of larger particles, the coating appearance is not smooth, affect the overall appearance of the building, so most structure for concealed works. In the fire, the material has a granular surface, a smaller density, a low thermal conductivity, or a heat absorbing property in the coating, delaying the temperature rise of the steel and protecting the steel. This kind of fire retardant coating is suitable for inorganic binder (such as water glass, silica sol, aluminum phosphate salt, refractory cement, etc.) together with inorganic light insulation aggregate materials (such as perlite, vermiculite, bouldering, sea and fly ash cenosphere), fire retardant additives, chemicals and materials (enhanced such as rock wool, aluminum silicate fiber, ceramic fiber, glass fiber and filler) mixed together, has the advantages of low cost. Spraying is often used in construction. It is suitable for indoor and outdoor concealed steel structure, high-rise steel structure and multi story steel structure with requirements of fire resistance above 2 h. Such as: high-rise building columns, general industrial and civil buildings in support of multi-storey columns of fire resistance should reach 3 h, the need to use this thick fire-retardant coating protection.

Q:The difference between rock wool and mineral wool

By the above two concepts, we should compare the difference between rock wool and slag cotton.1., raw materials are different: to metallurgical slag or fly ash as the main raw material called slag cotton; basalt and other rock as the main raw material called "rock wool"".2. the coefficient of acidity of rock wool and slag cotton is also different. Rock wool acidity coefficient MK generally greater than 1.5, and even up to more than 2; slag cotton MK generally can only be maintained at around 1.2, it is difficult to more than 1.3.3. because of the difference between chemical composition and acidity coefficient of rock wool and slag cotton, they also show some differences in performance.(1) the difference of water resistance(2) difference of heat resistance;(3) difference in corrosion resistance

Q:What is the difference between ordinary slag wool rock wool board and basalt rock wool board?

Rock wool and slag wool, chemical composition and acidity coefficient comparison in our country, the main raw material for blast furnace slag slag cotton general or other metallurgical slag, the main raw material for rock wool basalt or diabase, the chemical composition of the differences between them are larger (

Q:What are the building energy saving materials?

Rock wool is a selection of basalt or diabase as the main raw material, made by melting high temperature inorganic artificial fiber. Rock wool products have good thermal insulation, heat insulation, sound absorption, heat resistance, non combustion, and good chemical stability. Rock wool used for exterior walls of buildings. There are three forms of insulation: internal heat insulation, central sandwich insulation and external insulation.

Q:Fire retardant plywood does not belong to non-metallic refractory building materials

At present, there are many kinds of exterior wall insulation materials in the market, which can be divided into organic insulation materials and inorganic insulation materials.