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No GREENGUARD cert., though competition's blocks are... :(
on February 2, 2015
I have been very happy with Guidecraft products professionally and personally for more than 25 years. I liked selection much better than "ECR4Kids" 170-piece set, but purchased and ultimately returned these Guidecraft blocks recently after receiving this reply from Guidecraft a week after asking (through their internet site):
Usually the GREENGUARD certification is for building materials and furniture, but our classroom unit blocks are toys.
GREENGUARD is not a chemical-free license, but since both sets of blocks are rubber wood, and rubber wood is typically treated post-harvest with fungicides, pesticides and other processing chemicals, I felt better going with the competition's blocks. I did respond to Guidecraft and encouraged their decision-making teams to pursue marketing less chemically-treated blocks. The blocks sit in the open (off-gassing) in most venues -- and come into close contact with young children whose systems are far more sensitive to processing chemicals than adults, and who have frequently their hands on their mouths, noses and eyes. Chemical absorption through skin and facial features is inevitable, and I feel GREENGUARD goes some distance in reducing children to chemicals during their most vulnerable years.
Just my 2-cents' worth -- and thought others might find the information Guidecraft gave me useful, too.