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GB/T 26572 is a Chinese national standard that specifies the limits for certain hazardous substances in electrical and electronic products, while EU/International standards, such as the RoHS (Restriction of Hazardous Substances) Directive, set similar limits for the European Union and other countries. Here's a comparison of the limits for Pb, Hg, Cd, Cr(VI), PBB, and PBDE in GB/T 26572 and EU/International standards:

1. Lead (Pb):
   • GB/T 26572: ≤ 0.1% (1000 ppm) by weight
   • EU RoHS: ≤ 0.1% (1000 ppm) by weight ( Directive 2011/65/EU, Annex II)
2. Mercury (Hg):
   • GB/T 26572: ≤ 0.1% (1000 ppm) by weight
   • EU RoHS: ≤ 0.1% (1000 ppm) by weight (Directive 2011/65/EU, Annex II)
3. Cadmium (Cd):
   • GB/T 26572: ≤ 0.01% (100 ppm) by weight
   • EU RoHS: ≤ 0.01% (100 ppm) by weight (Directive 2011/65/EU, Annex II)
4. Hexavalent Chromium (Cr(VI)):
   • GB/T 26572: ≤ 0.1% (1000 ppm) by weight
   • EU RoHS: ≤ 0.1% (1000 ppm) by weight (Directive 2011/65/EU, Annex II)
5. Polybrominated Biphenyls (PBB):
   • GB/T 26572: ≤ 0.1% (1000 ppm) by weight
   • EU RoHS: prohibited (Directive 2011/65/EU, Annex II)
6. Polybrominated Diphenyl Ethers (PBDE):
   • GB/T 26572: ≤ 0.1% (1000 ppm) by weight
   • EU RoHS: prohibited (Directive 2011/65/EU, Annex II)

Key differences:

• PBB and PBDE are prohibited in the EU RoHS, while GB/T 26572 allows a limit of ≤ 0.1% (1000 ppm) by weight.
• The limits for Pb, Hg, Cd, and Cr(VI) are the same in both GB/T 26572 and EU RoHS.

Note that these limits may be subject to change, and it's essential to check the latest versions of the standards and directives for the most up-to-date information. Additionally, other international standards, such as IEC 63000, may have similar or more stringent requirements.