Presto Group

 Plastics that feel strong in the hand can still shatter when something hits them at speed, and a mould design, a filler, or even a change in cooling rate can quietly turn a tough grade into a brittle one. The Izod Impact Test exists to catch that change early. It measures the energy a notched plastic bar absorbs when a swinging pendulum strikes it, and the result tells you how resistant the material is to sudden shock. Two standards govern the method. ASTM D256 is the most common in North America and includes several variants, such as Method A for a standard notched cantilever and Method C for a reversed notch. ISO 180 is the international equivalent, and its units differ slightly. In both, the specimen is moulded or machined to about 63.5 mm by 12.7 mm by 3.2 mm, with a 45-degree notch cut 2.54 mm deep and a tip radius of 0.25 mm. The notch must be clean, since a rough one can lower the reading by a surprising margin. Before testing, specimens are conditioned for at least 40 h...

 Paper and board are made of cellulose fibres, and cellulose loves water. That is useful in some products and a real problem in others. A milk carton, a corrugated box stored in a humid warehouse or a sheet that has to take offset ink all need some control over how much water the surface will absorb. The Cobb Value gives that control a number, and it is one of the most widely used measures of water absorptiveness in paper testing. It is defined as the mass of water absorbed by a given area of paper or board in a set time, and it is expressed in grams per square metre. A low result means the sheet resists water well, usually because of good sizing or coating, while a high result means the surface drinks water quickly. The test follows ISO 535 and TAPPI T441, and the contact time is written as a subscript, such as Cobb60 for 60 seconds, with 30, 120 and 1800 seconds also in use. For the procedure, a sample is first conditioned at standard temperature and humidity and then weighed ...

 Material toughness is an important property that determines how well a material withstands sudden impacts without fracturing. In industries such as automotive, plastics, metal manufacturing, and construction, impact testing helps evaluate material performance under sudden loading conditions. The Izod and Charpy tests are widely used impact testing methods that measure the energy absorbed by a specimen during fracture. What Are Izod and Charpy Tests? The Izod and Charpy tests are pendulum impact testing methods used to evaluate the impact resistance of materials. Both tests measure the energy absorbed when a swinging pendulum strikes a specimen, helping manufacturers compare material toughness under specified conditions. Although both methods use similar testing principles, they differ in specimen positioning, support arrangements, and impact configurations. The appropriate method depends on the material being tested and the applicable testing standard. Working Principle of Izod a...

Corrugated packaging is widely used to protect products during storage, handling, and transportation. The strength of corrugated board directly affects its ability to withstand stacking pressure and prevent packaging damage. An ECT Tester helps manufacturers evaluate the edgewise compressive strength of corrugated board, making it an important instrument for packaging quality control. What Is an ECT Tester? An Edge Crush Test (ECT) Tester is a testing instrument used to measure the resistance of corrugated board to compression applied perpendicular to its flutes. The test evaluates how well the board can withstand crushing forces when positioned on its edge. ECT testing is particularly important for corrugated box manufacturers, packaging suppliers, and quality control laboratories. The results help assess board strength and support the selection of suitable packaging materials for different applications. ECT Tester Working Principle The working principle of an ECT Tester involves app...

  Introduction Moisture content is an important factor that affects the quality, strength, durability, and performance of different materials. Excess moisture can lead to product defects, dimensional changes, and storage problems. A digital moisture meter helps measure moisture levels quickly and supports quality control across various industries. Presto Stantest Pvt. Ltd. offers testing solutions designed to meet industrial inspection and quality assurance requirements. What Is a Digital Moisture Meter? A digital moisture meter is an electronic instrument used to measure the moisture content present in a material. It displays the measurement on a digital screen, making readings easier to observe and record. Depending on the model, the instrument may use electrical resistance, capacitance, or other measurement techniques. Digital moisture meters are available for different materials, including wood, paper, building materials, and agricultural products. Choosing the right model dep...