What is the most accurate method for measuring halogen content in solid materials?

Combustion Ion Chromatography (CIC) per IEC 62321-3-1 or ASTM E2396 is the most accurate and specific method — measuring each halogen (F, Cl, Br, I) independently with detection limits typically below 10 ppm. It is the reference method for RoHS compliance and halogen-free material qualification.

What is the "halogen-free" threshold for PCB laminates?

IEC 61249-2-21 defines halogen-free PCB base materials as containing ≤900 ppm chlorine, ≤900 ppm bromine, and ≤1,500 ppm total halogens — measured by CIC after combustion sample preparation.

Can XRF identify all four halogens?

XRF reliably detects chlorine (Cl) and bromine (Br) in most solid matrices. Fluorine (F) and iodine (I) are poorly detected by conventional XRF due to very low fluorescence energies and wavelength limitations. CIC or dedicated techniques are required for fluorine and iodine quantification.

What is an LSZH cable and why is halogen testing required?

LSZH (Low Smoke Zero Halogen) cable uses halogen-free polymer compounds (XLPE, EVA, silicone) for insulation and jacketing — eliminating toxic HCl/HBr gas release during fire. IEC 60754-1 measures the corrosive acid gas yield, and IEC 60754-2 measures pH and conductivity of combustion gases — together confirming LSZH compliance.

Which RoHS restricted substances involve halogens?

PBB (polybrominated biphenyls) and PBDE (polybrominated diphenyl ethers) are the two brominated flame retardant families restricted by RoHS at 0.1% maximum concentration in homogeneous materials within electrical and electronic equipment. Deca-BDE was added to RoHS restrictions in 2019 following its Stockholm Convention listing.

Dr. Bhargav Raval

Dr. Bhargav Raval is a Materials Scientist and Client Engagement Engineer with expertise in nanomaterials, polymers, and advanced material characterization. He holds a Ph.D. in Nanosciences from the Central University of Gujarat, where his research focused on graphene-based materials for flexible electronics. Professionally, he has led R&D in sensor technologies and coatings, including polymer-functionalized piezoelectric sensors for breath-based cancer diagnostics.
In his current role, Dr. Raval works closely with clients to understand technical requirements, design testing strategies, and deliver tailored solutions in materials selection, failure analysis, and performance evaluation. He effectively bridges scientific depth with practical outcomes, ensuring client-focused project execution. With peer-reviewed publications in high-impact journals and a proven record of applying materials science to real-world challenges, Dr. Raval continues to drive innovation at the intersection of research, engineering, and client engagement.

Email: bhargav@infinitalab.com

Website: https://scholar.google.com/citations?user=rlPTYWgAAAAJ&hl=en&oi=ao