How to distinguish between good and bad styrofoam quality

1. Color：High-quality styrofoam is milky white after being punched out（Snow-white kind）. It’s not good if the color is black, gray or extremely yellow( Describes the use of cheap and inferior quality raw materials to reduce Cost purpose).

2. Thick：发 When the foam comes out,,Bubble, Not too thin or too thick,If the foam is too thin, it will collapse,Foam that is too thick will dry out and shrink easily .

3. Paokong:Wait for the foam glue to solidify , Cut the foam,Look at the bubbles, The cells are uniform and dense, which is a good foam, such as big bubbles font>, Explanation of density difference, is not good（Only after the density is high, foam waterproofing font>, Sound insulation, elasticity and hardness are only guaranteed）

4. /span>Foaming amount:A good foaming agent has a larger foaming capacity, which can save usage and cost to a great extent.

5. Foam surface ：The surface of good foam is ravine-shaped, Poor foam has a smooth surface and wrinkles.

6. Foam size：Okay The foam is full and round,Poor foam foaming is small,And appear collapsed.

7. Adhesion：Good polyurethane foam filling The caulking agent will have strong adhesion, The caulking agent applied in the gaps will solidify quickly. In addition , The higher the proportion of main ingredients ;font-size:16px”>,The stronger the .

8, Stability:Squeeze the foam rubber block with your hands. Good glue will have good dimensional stability. It is elastic after complete curing. It is not good to be too soft or too hard. Poor foam glue has no elasticity and cannot recover or recovers when pressed with fingers after curing (foam rubber pays attention to elastic bonding. Inelasticity and strength cannot To achieve the effect reflected by foam glue).

9, Elastic：A good caulking agent has good elasticity after curing,can withstand a lot of force,Inferior products have less elasticity, After curing, pinch it with your hands and shrink it into a piece of paper. To see if the glue is good,you can check it on the newspaper,Is there any transparent wax on the back of the newspaper after curing?, The more you get, the lower the cost is. The better the white material catalyst is, the better the elasticity will be.

10, Shrinkage：All caulk will shrink,especially when the temperature is high ,When the humidity is not enough,but there will be a degree,The shrinkage of good caulking will not affect doors and windows,And poor quality may damage doors and windows.