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Views: 0 Author: Site Editor Publish Time: 2025-12-04 Origin: Site
Sampling: Choose an inconspicuous corner of the flooring (such as under a wardrobe or near the baseboard of a room) as the test area to avoid affecting the overall appearance.
Sanding: Hold the sandpaper with your fingers and sand back and forth 5-10 times in the test area with light force. Control the sanding range to approximately 2cm × 2cm. The force should be just enough to drive the sandpaper to slide, do not press hard.
Result Observation: After wiping off the sanding dust with a soft cloth, carefully observe the sanded area. If there are obvious white marks on the surface, forming a clear contrast with the surrounding unsanded area, it indicates that the flooring has probably undergone UV coating treatment; if there is no obvious color change after sanding, or only slight scratches appear, it may not have undergone UV treatment or the coating thickness is insufficient.
Sampling: Use an electric drill to drill about 5g of sample on the flooring substrate (avoiding the surface PVC layer). Grind the sample into fine powder (the smaller the particles, the more sufficient the extraction), accurately weigh it with a balance, and put it into a sealed glass bottle.
Formaldehyde Extraction: Add 50ml of toluene solvent to the bottle, seal it, shake it for 1 minute, and let it stand for 24 hours to allow formaldehyde to fully dissolve into the solvent.
Titration Testing: Pour 10ml of the extract into a beaker, add 3 drops of phenol reagent, and slowly add standard sodium hydroxide solution to the beaker with a burette until the solution color changes from colorless to pink and does not fade for 30 seconds. Record the volume of sodium hydroxide solution consumed, and calculate the formaldehyde content according to the formula (for specific calculation formula, refer to the national standard GB/T 17657-2013).
Preparation: Wash and dry the desiccator. Add 20ml of distilled water to the bottom of the desiccator, and place a 10cm × 10cm PVC flooring sample (remove the surface packaging and keep it clean) on the desiccator partition.
Sealed Release: Tightly cover the desiccator and place it in a normal temperature environment of 25℃ for 24 hours to allow the formaldehyde released by the flooring to dissolve into the distilled water.
Testing: Take out the petri dish, pour 5ml of distilled water from the desiccator into it, add the formaldehyde testing reagent, let it stand for 10-15 minutes according to the instructions of the testing kit, and compare it with the color card to judge the formaldehyde content. If the color is lighter than the 0.1mg/L color card, it indicates that the formaldehyde emission meets the standard (complying with the requirement of indoor decorative materials formaldehyde emission ≤ 0.1mg/m³ in the national standard GB 18587-2017).
Sampling: Select 3 adjacent test points on the flooring, mark them as A, B, and C respectively. The distance between each test point is more than 5cm to avoid mutual interference between liquids.
Liquid Dropping: Use a dropper to drop 2 drops of alcohol on point A, 2 drops of machine oil on point B, and 1 drop of dilute hydrochloric acid on point C (dilute hydrochloric acid is highly corrosive, avoid dripping on skin and clothes). Control the liquid range of each test point within 1cm in diameter.
Simulated Soaking: Cover the 3 test points with plastic wrap respectively, press gently to make the plastic wrap fit the flooring to prevent liquid volatilization, and place it in a normal temperature environment of 25℃ for 24 hours.
Result Observation: Uncover the plastic wrap, absorb the residual liquid with a soft cloth, and observe the surface state of the 3 test points. If obvious discoloration, bulging, cracking, or loss of luster occurs, it indicates that the flooring has poor acid and alkali resistance; if there is no obvious change on the surface and it can return to its original state only by simple wiping, the acid and alkali resistance is good.
Sample Preparation: Take a 2cm × 2cm bread slice, and spray the bread slice with a spray bottle until it is slightly damp (it feels moist but not dripping when touched by hand; a humid environment is a necessary condition for mold growth).
Sample Placement: Place the damp bread slice flat on the PVC flooring, cover the bread slice and the underlying flooring with a sealed plastic box (ensure a closed space is formed inside the plastic box), then wrap the plastic box tightly with a black plastic bag, and place it in a warm environment of 25-30℃ (such as inside a kitchen cabinet or near a heater), avoiding direct sunlight.
Result Observation: After 2 days, open the black plastic bag and the plastic box, and observe the mold growth on the bread slice and the underlying flooring surface. If obvious green and black mold spots appear on the bread slice, and mold also adheres to the flooring surface, it indicates that the flooring has weak antibacterial performance or has not undergone antibacterial treatment; if the bread slice only becomes slightly soft without obvious mold growth, and the flooring surface is clean and tidy, the antibacterial performance is good.
Choose the Right Test Area: All tests should be carried out in inconspicuous corners of the flooring to avoid irreversible damage to the flooring appearance.
Judge with Reference to National Standards: The formaldehyde test results should refer to the national standard GB 18587-2017 (≤ 0.1mg/m³), and the antibacterial performance can refer to GB/T 35265-2017 (antibacterial rate ≥ 90% is qualified). If a formal report is needed, it is recommended to entrust a third-party testing agency with CMA qualification.
Through the above methods, the core properties of PVC flooring can be quickly and preliminarily judged. When purchasing, it is recommended to give priority to products with brand guarantee and test reports, and verify them in combination with the testing methods in this article to ensure that you buy safe and durable PVC flooring.
