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Disadvantages and identification methods of inferior household door and window sealants


"A good user experience of home decoration doors and windows is closely related to "door and window installation"." However, in order to sell low prices, many merchants often think about the "material quality" at the installation end:

Use low-quality screws, sealants, and foaming agents to save costs. These materials will not show problems in a short period of time, but problems will explode after 1-2 years, such as rusted screws and cracked silicone sealants. This leads to problems such as water leakage and poor sealing of doors and windows, which greatly reduces the use experience and service life of doors and windows.

So "How to ensure the quality of the installation materials used at home?"

Recently, I learned a new trick "quick identification method of sealant is good or bad", which is specially used to find faults and deal with sneaky merchants. In this article, Baydee will pass on this new trick to you:

01 Before learning new tricks, you must first understand where the inferior sealant is "inferior": "Coca-Cola does not increase the price" and silicone sealant oil-filled

Those things that we thought hadn't increased in price have actually secretly "reduced the price without reducing the price". Inferior door and window silicone sealants are even more ruthless, and a replica of "water-injected beef"-"oil-injected glue" comes directly

Silicone sealant (neutral silicone sealant, acid silicone sealant, neutral silicone structural adhesive, etc.) Among all kinds of materials, the price of silicone base polymer is high, and at the same time, it has the highest content in a reasonable silicone sealant formula, so its cost often accounts for more than 75% of the cost of the entire silicone collagen material.

Considering the properties, good quality silicone sealant products can contain up to 50 % silicone base polymer or even more. As the price of raw materials for silicone-based polymers continues to rise, the cost of qualified sealants is getting higher and higher.

As a result, some manufacturers took the slant and embarked on the path of no return by replacing the content of silicone base polymers with oil injection, which greatly reduced the cost.

From the surface of the sealant, there is not much difference between oil-extended silicone sealant and non-oil-extended silicone sealant, and some even look brighter in appearance, but through experiments and actual use, it can be found that the durability of oil-extended adhesive is greatly reduced

The 5,000-hour UV aging test shows that after 500 hours of aging, the performance of the oil-filled sealing silicone rubber decreases significantly (the decrease in the maximum elongation represents the decrease in the elasticity of the sealant, and the colloid hardens and loses its elasticity). After aging for 3500 hours, the adhesion also started to have problems.

It is not difficult to explain why there are so many doors and windows around consumers that have cracked after using the sealant for less than 2 years (and chalking, hardening, oil flow, debonding, etc.):

There is another problem with oil-filled silicone sealants for home improvement doors and windows. When mineral oil seeps out and comes into contact with insulating glass, it will cause the sealing butyl glue on insulating glass (and other products) to be dissolved, resulting in the appearance of insulating glass. failure, or rainbow phenomenon

02 Brand sealant, identification method of good or bad sealant, other knowledge of home improvement door and window sealant

(1) For Xiaobai who is about to install windows, the first thing to do is to ask the merchant, "What brand of exterior wall glue is installed on the doors and windows?"

If you get: Silicon Bao, Zhijiang, Baiyun, Antai, Zhongyuan, Dow Corning (acquired and renamed Taoxi), GE, Wacker, etc., you can use it with confidence.

If the merchant is talking about other brands, it is necessary to ask the boss: "How many years can you guarantee the service life of this glue?" (The national standard requires a service life of 15-25 years), "What is the difference between good glue and bad glue?" , "What is the difference between structural adhesives and weather-resistant adhesives?" and other questions.

If you are not willing to use brand glue that costs more than ten yuan a piece, the door and window owner can be said to be irresponsible for the installation

(2) How to identify whether the sealant is good or bad

Consumers can also identify whether the glue used by the door and window owner is of good quality at home—that is, whether it is oil-filled glue:

① Prepare a few sheets of "plastic film" (such as agricultural plastic film, PE film, etc.), such as fresh-keeping film and fresh-keeping bags for home use; larger contact area

Wait for several hours, generally within 24 hours, whether the sealant is filled with oil can be identified. If the sealant is oil-filled, the plastic film in contact with it will shrink and wrinkle, while the non-oil-filled sealant will not shrink and wrinkle the plastic film in contact with it even if it is left for a longer period of time.