Precautions for Using Pressure Test Films (During Pressing and Testing Stages)
Pressing Stage Testing Stage
Method for Using Pressure Test Paper and Determining Pressure Values
Detecting Pressure Distribution with Pressure Test Film When using pressure test film, the red color density changes according to the applied pressure: Observation method:Place the developed K sheet with the shiny (PET) side facing up on a white sheet of paper, and observe in a well-lit environment to assess the pressure distribution. Determining Pressure Values Using Standard Pressure-Density Charts To obtain quantitative pressure values:
Pressure Test Paper Models and Corresponding Pressure Range
Model Pressure Range Type Recommended Applications 3LW 0.2 MPa – 0.6 MPa Ultra-low Pressure Precision testing for light pressure applications 4LW 0.05 MPa – 0.2 MPa Micro Pressure Small scale pressure testing in compact areas LLW 0.5 MPa – 2.5 MPa Low Pressure General industrial use for mid-level pressure applications LLLW 0.05 MPa – 0.2 MPa Super-micro Pressure Highly sensitive testing for very low pressure ranges LW 2.5 MPa – 10 MPa Medium Pressure Heavy-duty pressure testing for larger applications MS 1 MPa – 5 MPa Medium-High Pressure Industrial machinery, automotive parts testing HS 5 MPa – 10 MPa High Pressure High-pressure applications such as turbines and compressors HHS 10 MPa and above Ultra-high Pressure Specialized testing for high-pressure industrial environments Explanation:
Pressure Test Paper (Pressure-sensitive Paper) Usage Range and Measurement Methods
Checking the Pressure Distribution of Engine Cylinder GasketsMeasurement Method: Place pressure test paper on both sides of the engine cylinder gasket (on the engine body and head). After placing the gasket, close the engine body and head and tighten the bolts. Then, remove the engine body and head and check the pressure test paper for its color change.Key Check Points: Ensure that the surrounding color shows no significant gaps and the pressure value is within the specified range. The color distribution should be even, both horizontally and vertically.Recommended Models: High-Pressure (HHS), Pressure (HS), Medium-Pressure (MS/MW) BrakesMeasurement Method: Place pressure test paper between the brake pads, friction surface, and the drive system, and then operate the brake. After operation, remove the pressure test paper and observe the color change.Key Check Points: Ensure the contact area is sufficiently large, the pressure distribution is uniform, and the pressure remains above a specified value under slow, normal, and aggressive operation conditions. Also, check the consistency of the contact area and pressure after a specified number of uses (equivalent to running distance).Recommended Models: Low-Pressure (LW), Super-Low-Pressure (LLW) CarburetorMeasurement Method: Place pressure test paper at the joint of the metal seal, tighten the bolts, and ensure full connection. Then, remove the paper and observe the color change.Key Check Points: Ensure the color change at the joint is uniform, with the color concentration meeting the specified value. If any part shows lighter color, it indicates uneven pressure, which could lead to deformation or misalignment.Recommended Models: Medium-Pressure (MW), Low-Pressure (LW), Super-Low-Pressure (LLW) Oil PanMeasurement Method: Place pressure test paper at the joint where oil leakage is a concern, tighten the bolts to ensure a complete seal, and then remove the paper and check the color change.Recommended Models: Low-Pressure (LW), Super-Low-Pressure (LLW) ClutchMeasurement Method: Place pressure test paper between...
