Comparison of old and new ISO 9050 and ISO 10292 standards

The tables below compare the results calculated in accordance with the previous editions (ISO 9050:2003 and ISO 10292:1994) and the latest editions (ISO 9050:2026 and ISO 10292:2026) for five typical glass types. The five glass samples used for this comparison are the same as those featured on our NFRC/EN/ISO test method comparison page.

Example 1: Clear & uncoated laminated glass

Glass configuration: 6 mm clear glass + 1.52 mm PVB + 6 mm clear glass

Spectral transmittance and reflectance curves

	ISO 9050:2003 ISO 10292:1994	ISO 9050:2026 ISO 10292:2026
Visible light transmittance	0.865	0.865
Visible light reflectance, front	0.077	0.077
Visible light reflectance, back	0.077	0.077
Solar direct transmittance	0.675	0.671
Solar direct reflectance, front	0.064	0.064
Solar direct reflectance, back	0.065	0.065
Total solar energy transmittance (TSET)	0.743	0.731
Shading coefficient (SC)	0.854	0.840
U-value [W/(m²K)]	5.35	5.11

Example 2: Tinted & uncoated glass

Glass configuration: 8 mm tinted glass

	ISO 9050:2003 ISO 10292:1994	ISO 9050:2026 ISO 10292:2026
Visible light transmittance	0.368	0.368
Visible light reflectance, front	0.048	0.048
Visible light reflectance, back	0.053	0.053
Solar direct transmittance	0.362	0.360
Solar direct reflectance, front	0.047	0.048
Solar direct reflectance, back	0.052	0.052
Total solar energy transmittance (TSET)	0.514	0.494
Shading coefficient (SC)	0.591	0.567
U-value [W/(m²K)]	5.68	5.41

Example 3: Tinted & laminated glass with hard low-e coating

Glass configuration: 6 mm tinted glass + 1.52 mm PVB + 6 mm glass with hard low-e on #4

	ISO 9050:2003 ISO 10292:1994	ISO 9050:2026 ISO 10292:2026
Visible light transmittance	0.327	0.327
Visible light reflectance, front	0.053	0.053
Visible light reflectance, back	0.087	0.087
Solar direct transmittance	0.243	0.242
Solar direct reflectance, front	0.051	0.051
Solar direct reflectance, back	0.092	0.091
Total solar energy transmittance (TSET)	0.370	0.341
Shading coefficient (SC)	0.426	0.393
U-value [W/(m²K)]	3.85	3.31

Example 4: Clear DGU with soft low-e coating

Glass configuration: 8 mm clear glass with soft low-e on #2 + 12 mm air space + 5 mm low iron glass + 1.52 mm PVB + 5 mm low iron glass

	ISO 9050:2003 ISO 10292:1994	ISO 9050:2026 ISO 10292:2026
Visible light transmittance	0.701	0.701
Visible light reflectance, front	0.130	0.130
Visible light reflectance, back	0.136	0.136
Solar direct transmittance	0.306	0.311
Solar direct reflectance, front	0.466	0.455
Solar direct reflectance, back	0.418	0.405
Total solar energy transmittance (TSET)	0.335	0.341
Shading coefficient (SC)	0.385	0.392
U-value [W/(m²K)]	1.53	1.50

Example 5: Tinted DGU with soft low-e coating

Glass configuration: 6 mm tinted glass with soft low-e #2 + 12 mm air space + 6 mm clear glass

	ISO 9050:2003 ISO 10292:1994	ISO 9050:2026 ISO 10292:2026
Visible light transmittance	0.267	0.267
Visible light reflectance, front	0.098	0.098
Visible light reflectance, back	0.243	0.243
Solar direct transmittance	0.138	0.140
Solar direct reflectance, front	0.147	0.145
Solar direct reflectance, back	0.407	0.401
Total solar energy transmittance (TSET)	0.193	0.191
Shading coefficient (SC)	0.222	0.220
U-value [W/(m²K)]	1.57	1.56

One thought on “Comparison of old and new ISO 9050 and ISO 10292 standards”

aisyah devianti
16/10/2026 at 4:19 pm
This comparison is useful lah, because it helps readers understand how the updated ISO standards affect glass performance calculations and testing results.Telkom University Jakarta

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Comparison of old and new ISO 9050 and ISO 10292 standards

One thought on “Comparison of old and new ISO 9050 and ISO 10292 standards”

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