EN388 protective gloves performance tester

The EN388 protective gloves performance tester consists of several key components, including the Martindale wear tester, glove cut index tester, tear resistance tester, and puncture resistance tester. These devices are designed to evaluate the mechanical performance of gloves under various stress conditions, ensuring they meet safety standards for different applications. The Martindale wear tester operates by applying a controlled pressure to circular samples, which are then rubbed in a circular motion following a Lissajous pattern. This means the movement in two perpendicular directions has a simple integer frequency ratio, resulting in a harmonic trajectory. The test measures how long it takes for the sample to be worn through, with failure defined as the formation of a hole. This method is standardized in EN ISO 12947-1, where the total mass of the load block and specimen holder must be (595 ± 7) g, applying a pressure of (9 ± 0.2) kPa during testing. The glove cut index tester uses a rotating blade that moves back and forth under a fixed load to assess the resistance of the material to cutting. It is not suitable for very rigid materials like metal chain gloves. The blade should apply a consistent force of (5 ± 0.05) N, with a maximum cutting speed of 10 cm/s. For the tear resistance test, a rectangular sample is pulled in the direction of an initial slit, measuring the force required to propagate the tear. The system must have low inertia to ensure accurate readings. The test is conducted at a tensile speed of (100 ± 10) mm/min, and the highest force recorded is noted. The glove’s tear resistance rating is based on the lowest value from four tests. If the sample doesn’t fully tear even after exceeding 75 N, the test can be stopped, and the maximum force achieved is recorded. The puncture resistance tester evaluates the force needed to pierce a glove with a steel needle of specific dimensions. Unlike sharp objects or small needles, this test uses a standardized probe. The device must measure forces between 0 and 500 N, with low inertial compression. The steel needle is moved downward at 100 mm/min until it reaches a displacement of 50 mm, and the peak force is recorded, even if penetration hasn’t occurred. These tests collectively provide a comprehensive assessment of a glove's durability, helping manufacturers and users choose the right protection for specific hazards.

Wire Thread Insert

Wire thread inserts are helically coiled fastening devices that provide permanent, wear-resistant screw threads that exceed the strength of most parent material; the inserts are designed to protect tapped holes against failures due to stripping, seizing, corrosion, and wear.

Threaded inserts are typically used when the object in which a threaded fastener is being installed is made of a soft material. For hard materials, a screw or bolt can be often driven into the object without the need for a threaded insert. A simple solution is to use a threaded insert.

Wire Thread Insert,Wire Thread Auto Repair Inserts,Metal Wire Thread Insert,Wire Thread Repairing Insert

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