Ball pressure tester is used for testing parts of non-metallic materials for resistance to heat. It is applicable to electrotechnical equipment, its subassemblies and components, and to solid electrical insulating materials except ceramics.
In this test, a conditioned speciment is placed on a preheated support and subjected to a force of 20n applied through a 5 mm steel ball. The test stand, specimen and loading device are then kept in an oven at an elevated temperture for an hour. After the hour, the loading device is removed from the sample, the sample is cooled and any indentation is measured. It is important to assure that the test stand has reached a stale elevated temperature as required by the test. For this reason, the SFT ball pressure tester comes equipped with a thermocouple that inserts into the test stand so its temperature can be monitored.
Ball Pressure Apparatus/Tester is the requirement ball (R2.5mm) and total test force 20N ± 0.2N ball pressure testing device, pressure level of the state and was placed in the heating chamber on the surface of the test.
In the test temperature specified by the after 60min +2 min/0min, the test quickly (<10s) immersed in 20 ° C ± 5 ° C water cooling 6min ± 2min, 3min removed from the water surface within the indentation diameter measurement test, as the indentation is more than 2mm in diameter to evaluate the test specified in the heat deformation temperature.
Remark: Ball Pressure Instrument takes another a hot box (oven) supporting the use
Ball holder with bore and clamping screw for the bow
Precision 5mm pressure ball
Thermocouple for the test stand
Nickel plated steel materials for good thermal stability
Self-ballasted lamps shall be sufficiently resistant to heat. External parts of insulating material providing protection against electric shock, and parts of insulating material retaining live parts in position shall be sufficiently resistant to heat.
Compliance is checked by subjecting the parts to a ball-pressure test by means of the apparatus shown in figure 4.
The test is made in a heating cabinet at a temperature of (25 ± 5) °C in excess of the operating temperature of the relevant part according to clause 9, with a minimum of 125 °C for parts retaining live parts in position and 80 °C* for other parts. The surface of the part to be tested is placed in the horizontal position and a steel ball of 5 mm diameter pressed against this surface with a force of 20 N.
The test load and the supporting means are placed within the heating cabinet for a sufficient time to ensure that they have attained the stabilized testing temperature before the test commences.
The part to be tested is placed in the heating cabinet, for a period of 10 min, before the test load is applied.
If the surface under test bends, the part where the ball presses is supported. For this purpose if the test cannot be made on the complete specimen, a suitable part may be cut from it.
The specimen shall be at least 2,5 mm thick, but if such a thickness is not available on the specimen then two or more pieces are placed together.
After 1 hour the ball is removed from the specimen which is then immersed for 10 s in cold water for cooling down to approximately room temperature. The diameter of the impression is measured, and shall not exceed 2 mm.
In the event of curved surfaces the shorter axis is measured if the indent is elliptical.
In case of doubt, the depth of the impression is measured and the diameter calculated using the formula f = 2 p (5 - p) , in which p = depth of impression.
The test is not made on parts of ceramic material.
Shenzhen Julixing Instruments Co., Ltd.are specialized in manufacturing special, custom built, test and measuring equipment for products testing as per international norms and offering calibration services andrelated information. Our products and services are used by research & development establishments, test laboratories, defense establishments, government institutions & manufacturing industries to fulfill the clients' requirements.
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