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Ball Pressure Test Apparatus

Ball Pressure Test Apparatus
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Parent Product
Household Appliance Safety Testing Equipment
Standards
IEC 60320-1
IEC 60335-1
IEC 60598-1
IEC 60695-10-2
IEC 60884-1
IEC 60950-1
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Ball Pressure Test Apparatus - QualiHSA™ BPT

Ball Pressure Test Apparatus QualiHSA™ BPT presses a 5 mm steel ball into a heated specimen under a 20 N load to measure resistance to softening. Compliance laboratories run the test on enclosures, insulating supports, and other non-metallic parts of electrical equipment. The apparatus sits inside a heating cabinet held at the temperature the product standard names, and the operator measures the indentation left behind once the specimen has cooled. An indentation of 2.0 mm or less means the material passed.

Stainless steel construction runs through the loading device and the specimen support, so the apparatus holds its dimensions after repeated cycles at elevated test temperatures. The support is a solid stainless cylinder 50 mm in diameter and 100 mm long, with enough thermal mass to hold the specimen at temperature. Total applied force stays within 20 N ± 0.2 N, including the mass of the ball itself. The QualiHSA™ BPT needs a separate heating cabinet, which laboratories usually already own.

Plug and socket makers, appliance manufacturers, luminaire producers, and IT equipment suppliers all face a ball pressure requirement somewhere in their safety file. The test appears across several IEC product standards, each naming its own temperature for the part under examination. Buying one apparatus covers all of those programs, since the ball, load, and support geometry stay the same. Only the oven temperature changes with the product standard and the part being assessed.

Ball Pressure Test Apparatus - QualiHSA™ BPT Applications

The QualiHSA™ BPT applies to non-metallic parts of electrotechnical equipment, its subassemblies and components, and to solid electrical insulating materials other than ceramics. Any molded part that supports, encloses, or separates live conductors is a candidate for the test.

  • Plugs, Socket-Outlets, and Appliance Couplers: heat resistance checks on housings and insulating barriers covered by IEC 60884-1 and IEC 60320-1
  • Household Appliance Manufacturing: enclosure and terminal block assessment where softening could shift a live part out of position
  • Luminaire Production: lampholders, driver housings, and insulating spacers tested at the temperatures luminaire standards name
  • IT and Consumer Electronics: power supply housings, connector bodies, and internal supports checked for deformation at operating temperature
  • Terminal Block and Connector Suppliers: verification that thermoplastic bodies hold their form under sustained heat and clamping load
  • Solid Insulating Material Development: comparison of candidate thermoplastics and thermosets by indentation diameter at a fixed temperature
  • Safety Certification Laboratories: routine heat resistance testing across several IEC product families on one fixture
  • Incoming Quality Control: batch checks on molded parts received from suppliers before they reach assembly
Ball Pressure Test Apparatus

Standards

The QualiHSA™ BPT is designed to align with the ball pressure test method and the product standards that call for it. Ball diameter, applied force, and support geometry follow the method definition, while the test temperature comes from the relevant product standard.

  • IEC 60320-1 - Appliance Couplers for Household and Similar General Purposes: Part 1: General Requirements
  • IEC 60335-1 - Household and Similar Electrical Appliances: Safety: Part 1: General Requirements
  • IEC 60598-1 - Luminaires: Part 1: General Requirements and Tests
  • IEC 60695-10-2 - Fire Hazard Testing: Part 10-2: Abnormal Heat: Ball Pressure Test Method
  • IEC 60884-1 - Plugs and Socket-Outlets for Household and Similar Purposes: Part 1: General Requirements
  • IEC 60950-1 - Information Technology Equipment: Safety: Part 1: General Requirements

Ball Pressure Test Apparatus - QualiHSA™ BPT Key Features

The QualiHSA™ BPT strips the test down to the parts that decide the result: ball geometry, applied force, and specimen support. Everything else stays simple, because the fixture has no electronics to drift or fail.

  • Standard 5 mm Pressure Ball: R2.5 mm ball geometry matching the method definition, so indentation results compare across laboratories
  • Calibrated 20 N Loading: total applied force of 20 N ± 0.2 N, including the mass of the ball, applied by dead weight rather than a spring
  • Heavy Stainless Specimen Support: 50 mm diameter, 100 mm long solid cylinder that holds the specimen at oven temperature through the full hold period
  • All-Stainless Construction: every heated component is stainless steel, which resists oxidation and dimensional drift across repeated cycles
  • Oven-Independent Design: works with any heating cabinet capable of the required temperature, so laboratories use the oven they already have
  • Straightforward Operation: the operator preheats the fixture, places the specimen, and lowers the ball, with no electrical connections to make
  • Multi-Standard Coverage: one fixture serves appliance, luminaire, plug and socket, appliance coupler, and IT equipment programs
  • Low Maintenance: no motors, sensors, or control electronics, so servicing comes down to periodic checks of ball condition and applied force

Theory and Method

Thermoplastics lose stiffness as temperature climbs toward their softening range, and the loss is gradual rather than sudden. A part that feels rigid on the bench can creep slowly under a steady load once it sits at operating temperature for an hour. The ball pressure test puts a number on that behavior: a fixed force, a fixed contact geometry, a fixed hold time, and a measured permanent indentation. Softening that lets an insulating support move can shrink creepage distances and expose a live conductor.

A 5 mm ball concentrates 20 N into a contact circle well under a millimeter across, which raises local stress far above the average pressure a flat punch would apply. The curved surface also means contact area grows as the ball sinks, so stress falls off and the indentation self-limits instead of running away. Holding the load for 60 minutes lets viscoelastic creep run to a near-stable depth. Cooling in water then freezes the deformation before the polymer can recover elastically.

Reproducibility depends on the specimen never cooling during the test. The solid stainless support cylinder carries enough thermal mass to hold the contact zone at oven temperature while the ball presses down, and stainless steel resists the scaling that would change surface flatness over time. Preheating the support and loading device in the cabinet before the specimen goes in removes any thermal transient. Measurement follows quickly after cooling, with the operator reading indentation diameter under a magnifier on a calibrated cross-travel stage.

Ball Pressure Test Apparatus - QualiHSA™ BPT Technical Specifications

ParameterSpecification
Ball Diameter5 mm (R2.5 mm)
Total Test Force20 N ± 0.2 N, including the mass of the ball
Specimen SupportSolid stainless steel cylinder, 50 mm diameter × 100 mm long
Materials of ConstructionStainless steel throughout
Heating SourceSeparate heating cabinet or oven, not supplied
Test TemperatureSet by the applicable product standard
Acceptance CriterionIndentation diameter not exceeding 2.0 mm

Test Sequence

StepParameter
PreheatSupport and loading device brought to test temperature in the heating cabinet before the specimen is introduced
Hold at temperature60 minutes, +2 / 0 minutes
Transfer to waterWithin 10 seconds of removing the load
CoolingSpecimen cooled in water at 20 °C ± 5 °C until it returns to approximately room temperature
MeasurementIndentation diameter read within 3 minutes of removal from the water
ResultPass when the indentation diameter does not exceed 2.0 mm

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