Equipment: Cut Test MachineSummary: A circular rotating blade is placed onto a sample cut from the palm of a protective glove. The number of cycles needed to cut through the glove sample is compared with the number of cut cycles needed to cut through a standard reference material. This data is used to determine the performance level of
the test material.
Equipment: TDM 100 Machine
Summary: EN ISO 13997 cut testing for high cut-resistant gloves of cut index 4 and 5 uses the TDM 100 machine. A blade at a specified load is moved across a specimen, and each blade is used only once. The distance from initial contact to cut-through is recorded. At least 15 readings are taken, at three cut-through distances ranges; i.e., 5 mm to 15 mm, 15 mm to 30 mm, 30 mm to 50 mm. The load versus distance curve determines the cut resistance weight at 20 mm cut-through distance.
Equipment: CPPT Machine
Summary: According to the new standard F1790-04, which is yet to be implemented, cut resistance under F1970 can also be tested with the CPPT machine. CPPT is different from TDM 100 in that the force is applied horizontal to gravitational force, rather than along the specimen curvature.
Equipment: Martindale Wear and Abrasion Test Machine Summary: This test determines ability of test samples to resist abrasion. Samples are allowed to rotate in contact with glass paper in a complex pattern known as a Lissajous figure and are inspected at intervals corresponding to the performance levels.
Equipment: Taber Machine Test (ASTM D3389-05) Summary: Circular specimens are taken from the palms of the left and right gloves and attached to the mounting cards. Weight is applied to the abrading wheel – 500 g with 1000 abrasion cycles or better for levels 1 to 3, and 1000 g with up to 20,000 or more abrasion cycles for levels 4 to 6.
Equipment: Tensometer Machine
Summary: Tear resistance is determined by die cutting a test sample from the palm of a protective glove. The shape of the test sample resembles a pair of trousers. The Tensometer machine grasps each “leg” of the pants and slowly pulls them apart. The force needed to tear through the test sample is recorded and a performance score is assigned. The Tensometer is also used to determine puncture resistance. A test sample cut from the palm of a protective glove is placed in a small frame. A metal rod with a blunt point is slowly pressed into the fabric until break through occurs. The force needed to penetrate the glove samples is converted to a Performance Score.
All Ninja® factories are fully equipped with the same test equipment used by accredited laboratories. This equipment is used in the routine testing of production to ensure that quality and performance are consistent. Listed below are descriptions of some of the many tests that are performed.
Equipment: 1000 mL Water Integrity Test Machine
Summary: Statistical samples are taken from a production lot and tested for pinholes. Individual gloves are fitted onto special sleeves and filled with 1000 mL of water. Technicians check the gloves for leaks and determine performance levels or AQLs. Alternatively, gloves may be placed onto a cone, open at one end, and then inflated under water and inspected for leakage.
Performance rating for degradation is not easy, and although there are test methods available involving puncture resistance comparison before and after exposure to chemicals, they are more meaningful for unsupported glove sections. The liner element of supported gloves can obstruct a meaningful interpretation of this type of test. The test used at Ninja® is quite simple and is meant to give an indication of the exibility of a glove after chemical exposure and drying. It is therefore an empirical test and the results should be considered alongside all other data to assist in glove selection.
Equipment: Permeation Machine Summary: This test determines the time needed for a chemical to permeate through a barrier. In this case, the barrier is a sample cut from the palm area of a protective glove. The sample is placed in a permeation cell and the outer surface of the glove sample is exposed to a chemical. The inside surface of the glove material is carefully monitored to detect the presence of the test chemical.
Equipment: Permeation Cell and Detection System Summary: The test determines the time for a target chemical to permeate through a barrier. The barrier for glove testing is taken from the palm area of a protective glove. The permeation cell shown below is composed of two separate hemispheres that are clamped together for the test, the glove sample forming a barrier between them with the outer surface available to the target chemical. The target chemical is introduced into one compartment as shown and on the other side of the sample under test there will be a continuous flow of clean inert gas or deionised water, depending on the target chemical, which is continuously monitored by analytical equipment capable of detecting the very small concentration required for this method.