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Insulation strips' knowledge

Time : 2023-03-23 Hits : 13

The thermal insulation strip is the core component of the threaded thermal insulation profile, which is a "bridge break" in the heat transfer path of the aluminum profile, reducing the transfer of heat in the aluminum profile; It is also a structural connection of aluminum profiles on both sides of the thermal insulation profile. Through its connection, the three parts of the thermal insulation profile become a whole and jointly bear the load. Unlike rubber strips, it is made of new composite materials by mechanical rolling, and cannot be replaced alone. Replacement can only be performed together with the entire profile.

Currently, there are three types of thermal insulation strips for aluminum alloy doors and windows, one using PVC (polyvinyl chloride) as the raw material, one using PU (polyurethane) as the raw material, and the other using PA (polyurethane, commonly known as nylon) as the raw material. PVC insulation strips and PA insulation strips are both extrusion processes, while PU adhesive strips are injection molding processes. This article will mainly introduce the relevant knowledge of PA insulation strips.

Comparison of the performance of PA insulation strips and PVC insulation strips

The main raw materials for PA insulation strips are PA66 plus 25% glass fiber, and the main raw materials for PVC insulation strips are PVC resin powder plus 25% carbon dioxide. Compared to PVC insulation strips, PA insulation strips have the following advantages:

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1. High tensile strength

PA insulation strip:>=126N/mm

PVC insulation strip: about 70N/mm

2. High thermal deformation temperature

PA insulation strip: 240 ℃

PVC insulation strip: 90 ℃

3. Durable, PVC insulation strips are prone to aging

4. Good self extinguishing performance

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How to distinguish between PA insulation strips and PVC insulation strips

1. The appearance of PA insulation strip is not as smooth as that of PVC insulation strip.

It only takes one or two times to break the PA insulation strip by hand, while it takes more than ten times to break the PVC insulation strip.

3. There is a clear and crisp sound when the PA heat insulation strip is broken, and the fracture can be restored without deformation after breaking; After the PVC heat insulation strip is broken, the fracture becomes white and deformed, making it impossible to butt restore.

4. With the same specification and model, the weight of PA insulation strip is slightly less than that of PVC insulation strip.

National standard for PA insulation strips

1. Requirements for testing splines

The sample must be dry with a moisture content of less than 0.2% (weight percentage) or dried in a 140 ℃ soil 2 ℃ ordinary drying oven for 6 hours before completing all tests within one hour.

2. Detection environment

Room temperature: 23 ℃± 2 ℃

3. Several main indicators

characteristic value

Transverse and longitudinal tensile strength

Thermal deformation temperature

impact strength

Stress cracking performance

High and low temperature transverse tensile strength

Glass fiber content

Characteristics and storage precautions of heat insulation strips

Thermal insulation strips are best stored at room temperature, in a dry, ventilated environment, because the characteristic of poly-cool amine is that it can become soft and large in size under high or humid temperatures, resulting in the inability of the thermal insulation strips to penetrate the profile cavity: In low temperatures, the thermal insulation strips can become brittle and small in size, which can easily crack when threading, leading to the scrapping of the profile. In addition, the storage time of the heat insulation strip should not exceed one year. The heat insulation strip will slowly absorb the moisture in the air, and the heat insulation strip will degrade and become very brittle, resulting in the unusable heat insulation strip.

More details about insulation strips, just contact  [email protected]

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