4,4'-Methylenebis(2-Chloroaniline) (MBOCA/MOCA) Medical Surveillance

MBOCA (MOCA) is a probable bladder/liver carcinogen absorbed through skin; affects workers in polyurethane elastomer/casting and curing-agent operations. Surveillance keys on a urinary biological exposure limit rather than airborne sampling.

No category-specific Federal OSHA standard

No direct federal OSHA substance-specific MBOCA standard exists. (MBOCA was among substances OSHA addressed by separate rulemaking that did not survive as a discrete substance standard.) Federal coverage is general only — Hazard Communication (1910.1200) and the General Duty Clause. Documented here primarily to prevent citation confusion: Cal/OSHA regulates MBOCA at 8 CCR 5215, which is distinct from DBCP at 8 CCR 5212.

Where no dedicated Federal OSHA standard exists, Occu-Med applies the corresponding California requirements and general duty-of-care best practices.

How this compares to Cal/OSHA: California-only — 8 CCR 5215 regulates MBOCA via a urinary biological exposure limit (urine MBOCA ≤ 100 µg/L) with comprehensive liver/pulmonary/urinary/breast/hematologic exams, chest X-ray, CBC, urinalysis, and liver function tests; there is NO direct federal OSHA substance-specific MBOCA standard (federal coverage is HazCom + General Duty Clause only). Critically, this standard requires NO urine cytology. Note the common citation trap: 5215 (MBOCA) is distinct from 5212 (DBCP).

Occu-Med handles 4,4'-Methylenebis(2-Chloroaniline) (MBOCA/MOCA) surveillance end-to-end

Scheduling, exams, lab panels, physician review, removal/return determinations, and audit-ready recordkeeping — fully compliant with Federal OSHA requirements.

📞 (559) 435-2800 x102 ✉ ccoyle@occu-med.com