Ball-pressure Apparatus is used for testing parts of nonmetallic
materials for resistance to heat. It is applicable to electrical
equipment,lighting equipment, lowvoltage apparatus, Household
electrical appliances, machine tool electrical appliances, motor,
electric tools, electronic instruments, electrical instrumentation,
information technology equipment, electrical business equipment,
electrical fittings and accessories such as electrical and
electronic products and its component parts
Ball-pressure Apparatus is the requirement ball(R2.5mm)and total
test force 20±0.2N ball pressure testing device,pressure level of
the state and was placed in the heating chamber on the surface of
· ball holder with bore and clamping screw for the bow
· Precision5mmpressure ball
· Thermocouple for the test stand
· Nickel plated steel materials for good thermal stability
|Ball diameter||5mm (R2.5mm)|
|Total test pressure||20N±0.2N|
|Samples bearing||diameter50mm, length100mm, solid stanless steel cylinder|
|Production of materials||all used stainless steel materials|
|Remark||Ball pressure instrument takes another a hot box (oven) supporting
IEC60238, IEC60309, IEC60320, IEC60335, IEC60598, IEC60601,
IEC60669, IEC60670, IEC60745, IEC60884, IEC60950, IEC60998,
Resistance to heat
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.
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 of125 °Cfor parts retaining
live parts in position and80 °C* for other parts. The surface of
the part to be tested is placed in the horizontal position and a
steel ball of5 mmdiameter 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
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 mmthick, but if such a thickness
is not available on the specimen then two or more pieces are placed
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 exceed2 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.