Appraisal of the quality of the veneer glass magnesium plate

laminated glass magnesium board is based on the core principle of the magnesium oxide-magnesium chloride ternary system gelling reaction and reinforced material composite. By optimizing the active MgO content, chloride ion control and surface veneer process, it achieves the synergy of bending strength, fire resistance limit and environmental protection. It is widely used in building partitions, fireproof ceilings, clean workshops and ship cabins. In medical buildings, it is used as sterile wall panels in operating rooms; in rail transit, it meets the lightweight requirements for fireproof partitions in carriages; in industrial plants, it ensures moisture-proof and mildew-proof performance in high-humidity environments. Compared with ordinary gypsum board, laminated glass magnesium board has the characteristics of strong impact resistance, excellent dimensional stability and Class A fire protection. It is the core material integrating building fire protection and functional decoration.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for laminated glass magnesium panels. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for the quality appraisal of laminated glass magnesium panels.

With the popularity of prefabricated buildings, related quality dispute cases have increased significantly. The focus of judicial disputes is:

1, disputes over performance indicators: whether the bending strength meets the standard, and the temperature rise of the back fire surface during the fire resistance test exceeds the standard;

2, material defects: insufficient MgO active content, chloride ions The content exceeds the standard;

3, process problems: insufficient layers of glass fiber mesh cloth, veneer hot pressing temperature deviation;

4, contract performance disputes: veneer material replacement, core board density does not match the technical agreement.

The quality appraisal of laminated glass magnesium boards usually uses the following technical methods:

1. Appearance inspection

Check whether there are scratches, bubbles, color differences and other defects on the surface of the glass magnesium boards.

2. Dimensional measurement

Measure whether the length, width and thickness of the glass magnesium board meet the contract requirements.

0 Place the glass magnesium board in a flame, observe its combustion characteristics, and evaluate its fire resistance.

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A hospital of the applicant signed a "Grade A Fireproof Glass Magnesium Board Procurement Contract" with a building materials factory of the respondent, and it was agreed that the chloride ion content should be ≤8%. After the construction, frost appeared on the wall. The manufacturer argued that it was due to the construction party not performing moisture-proof treatment.

identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information, contract technical agreement, on-site inspection case materials and other data of "Laminated Glass Magnesium Board" and made the following quality analysis Opinion:

The Cl⁻ content of the veneered glass magnesium board involved in the case reached 14.5% (agreement ≤ 8%), the MgO activity was only 58% (agreement ≥ 65%); the bonding strength between the veneer and the core material was only 0.3MPa (agreement ≥ 0.8MPa), and the veneer delamination rate reached 30% after the hygrothermal cycle test.

The appraisal conclusion concluded that out-of-control raw material ratio and process defects were the main causes of quality.

laminated glass magnesium board quality appraisal report should include:

1, appraisal purpose and reference standards;

2, involved specifications, production batch number, construction record;

3, detection method and equipment list;

4, test data and failure correlation analysis;