Permeability resistance of acid and alkali resistant gloves
Wall Mounted 2 Way Diverter Valve, Brass Wall Mounted Side Valve, Wall Mounted Mixer Valve WPWF (JIANGMEN) Sanitary Ware Company Co.，Ltd. , https://www.yunspirefaucet.com
Permeability resistance of acid and alkali resistant gloves is a critical test to ensure their effectiveness in protecting users from harmful chemicals. This testing process involves several detailed steps to evaluate both the material’s integrity and its ability to resist chemical penetration over time.
First, for latex and rubber gloves, three samples are cut from different areas: the palm, back of the hand, and the sleeve. Each sample measures 100 mm × 100 mm, making a total of nine pieces. These samples are placed on a glass tube filled with either 68% sulfuric acid or 40% sodium hydroxide solution, with a dye such as blue or crystal violet added to make the solution visible. The glass tube is then positioned on a glass plate covered with filter paper. The test piece is in contact with the solution for 30 minutes. Afterward, the filter paper should show no color change, and the surface of the test piece must remain intact—no cracks, dissolution, or peeling should be observed after washing and drying.
Following this initial test, the samples undergo a tensile test. A force of 4.9 N (including the weight of the lower clamp) is applied for 10 minutes. During this time, the test piece should not develop any cracks or breakages. To further confirm the results, the same test is repeated, but the contact time with the solution is reduced to 15 minutes. Again, no abnormalities should be detected.
In addition to permeability resistance, the gloves are also tested for penetration resistance. For this, finished gloves are immersed in 68% sulfuric acid or 40% sodium hydroxide solution (ensuring that the wrist area is fully saturated) for 30 minutes. Afterward, they are hung to dry naturally for 24 hours without removing the attached solution. This process is repeated three times. Once dried, the gloves are worn on a hand and subjected to 30 gripping and relaxing actions. A visual inspection is then performed to check for any signs of damage, such as swelling, hardening, or shrinking. Only if all parts of the glove remain unaffected can it be considered as having passed the penetration resistance test.
For acid and alkali resistant plastic gloves, the same testing procedure applies. Both the test pieces and finished products are exposed to 40% sulfuric acid or 35% sodium hydroxide solution in the same way as latex and rubber gloves. This ensures that all types of protective gloves meet the necessary safety standards.
This comprehensive testing helps manufacturers and users determine the reliability and durability of these gloves under harsh chemical conditions. It plays a vital role in ensuring workplace safety and preventing chemical exposure.
This article is from: http://