Simple Identification Methods for General Users
Tapping/Sound Method:Gently tap the glass surface. Argon-filled insulated glass produces a more solid sound with minimal internal echo, whereas standard insulated glass without argon produces a more distinct echo. This method requires a sample of the same specifications for comparison and has limited accuracy.
Low-Temperature Observation: Observe the glass condition during extremely cold weather. Properly argon-filled insulated glass is less prone to internal moisture, condensation, or frost formation within the cavity; this serves only as a supplementary reference.
Manufacturing Traceability: Reputable manufacturers typically fill insulated glass units (IGUs) with argon if the surface area is ≥2.5 m² or if Low-E coating is used; this prevents glass deflection (implosion) and delays Low-E coating oxidation. Gas-filling status can be verified through production records.
Precise Detection Methods Using Professional Equipment
Qualitative Spark Detection:Using a high-voltage spark generator, a probe touches the glass surface. On glass without argon, the spark remains on the surface; on argon-filled glass, the spark penetrates into the internal cavity. This method is not suitable for coated glass.
Quantitative Contact Detection: A specialized sensor pierces the sealant to directly sample the gas inside the cavity, accurately measuring the actual argon content to verify if it meets the national standard requirement of ≥85% initial fill concentration.
Quantitative Non-Contact Detection:Using an inert gas detector for insulated glass, argon content can be measured without damaging the glass structure simply by aiming the device at the glass surface. This is a common non-destructive testing method used in residential renovation scenarios.