Can you bring Formaldehyde solution, less than 10 percent on a plane?
Coop checked the book. Here's the ruling for Formaldehyde solution, less than 10 percent:
What the TSA says
Formaldehyde solutions of less than 10% are not restricted as hazardous materials. Leak-proof packaging with absorbent material is still strongly encouraged. For formaldehyde solutions containing more than 10% formaldehyde, see separate entry for "Biological specimens in preservative solutions." Tip: Full-strength "Formalin" is typically 35%-40% formaldehyde by volume. So a solution that is less than 25% Formalin would be less than 10% formaldehyde and not restricted.
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Based on official TSA guidance. The final decision rests with the TSA officer at the checkpoint.