The reason of stone black seam

There are three main reasons for black stone joints:

1, Gap pollution

2, Water seepage

3, Seep

This infiltration of glue is the most easily ignored reason, few people will think of the stone along the gap black phenomenon is infiltration of glue.

First, marble glue

1, The use of inferior marble glue

Poor quality marble glue use low price unsaturated resin, marble glue in the process of curing heat, unsaturated resin in a free state, forming glue oil diffusion into the stone;

The powder particles of inferior marble glue are rough and the oil solubility is poor in the reaction process.

2, Curing temperature is not well mastered

The mixing ratio of glue and curing agent should be 100:1~4.The curing agent added with more heat release is large, and the glue dries fast.Hardener put less or forget to put, the resin in the glue in the uncatalyzed state, will release glue oil.The placement of curing agent should consider the ambient temperature. The amount of curing agent should be put less when the temperature is low, and the construction is prohibited when the temperature is lower than 5℃.

Two, stone material

Stone material with low density, large porosity and high water absorption is easy to permeate rubber oil, such as:

Dolomite, dolomite metamorphic rocks: jazz white, Yushi white, fine white and so on

Limestone: French wood grain, Italian wood grain, Guizhou wood grain, cave stone, etc

Sandstone: white sand beige, etc