Test of incombustibility of cement adhesives BS 476-4

In theory, the adhesive BS 476-4 Non flammability test ,BS 476-4 Incombustibility test is mainly aimed at incombustible materials , Such as gypsum board , Calcium silicate board , Nonflammable materials such as metals , Adhesives are generally flammable materials . If it is mixed with cement to make a sample , You can try , Because cement is a non combustible material .

Standard full name ：

BS476-4: Combustion test of building materials and structures — The first 4 part ： Material non flammability test

BS476-4: Fire tests on building materials and structures- Part 4: Non-combustibility test for materials

Sample specification ：

40mm ×40mm X 50mm

Precautions for sample preparation ：

If the thickness of the material is less than the specified height , Each sample must be stacked by enough samples to this thickness . These sample layers must be placed flat in the sample holder , At the same time, it must be tied with thin iron wire , Avoid gaps between layers , But it must not be compressed . The density of the sample must be representative of the actual density of the material .

For composites , If stacking by integer layers cannot reach the required sample size , By adjusting the thickness of different components , Make the proportion of each component in the sample the same as the measured material . If neither of the above methods is feasible , Then each independent group hierarchy is tested separately , Report separately .

Test the temperature in the furnace ：

The temperature inside the furnace reaches 750℃, This state continues throughout the test 20 minute

How to record ：

Put the sample into the test container , The thermocouple is inserted into the center of the sample and connected to the test equipment , Record the relevant data of the two thermocouples .

BS 476 Other standards ：

BS 476-4： Fire test of building materials and structures - Material non flammability test

BS 476-5： Test method for ignitability of building materials

BS 476-6： Fire test of building materials and components . The first 6 part : Test method for fire spread of products

BS 476-7： Fire test of building materials and components . The first 7 part : Test method for determining the classification of flame surface spread of products

BS 476-20： Fire test of building materials and components . The first 20 part : Test method for fire resistance of building components ( The general principle )

BS 476-21： Fire test of building materials and components . The first 21 part : Test method for fire resistance of load-bearing components

BS 476-22： Test method for fire protection of non loaded building elements

BS 476-23： Fire test of building materials and components . The first 23 part : Test method for apportionment of fire resistance of components to components

JJ2022