New Isocyanate Primer, Unlabeled Bottles, and a Locked SDS Binder
Northside Collision is a 14-employee auto body shop that has just switched to a two-part urethane primer containing hexamethylene diisocyanate. The safety data sheet arrived Monday afternoon and was filed in the manager's locked office, where the binder has stayed since; only the manager has a key. On Tuesday the shop foreman transferred the activated primer into three unlabeled plastic squeeze bottles that sit on the mixing bench and are used by painters on all three shifts until they are empty. Painters began spraying the new product Tuesday afternoon. No one has been trained on the new primer, and no one mentioned the change at the morning meeting. On Thursday a painter reports wheezing and chest tightness and is sent to a clinic, where he is diagnosed with acute bronchitis and told to avoid isocyanate exposure. Painters wear half-mask elastomeric respirators with organic vapor cartridges they bought themselves. There is no written respiratory protection program, no fit testing, and one painter has a full beard.
1. Is the unlabeled squeeze bottle acceptable under the Hazard Communication standard, and does the locked office satisfy the employer's duty to make SDSs accessible?
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Both practices fail.
Labels. 1910.1200(f)(2) exempts portable containers from labeling only when the hazardous chemical is transferred from a labeled container and is intended only for the immediate use of the employee who performs the transfer. Here one person decanted the primer and three shifts draw from the same bottles over hours or days, so the exemption collapses. Each bottle needs a workplace label carrying the product identifier and the hazard information - words, pictures, symbols, or a combination - and the shop may use its own labeling system as long as it conveys the hazards.
SDS access. 1910.1200(g)(8) requires that SDSs be readily accessible to employees in their work area during each work shift. A binder locked in an office to which employees have no key is not readily accessible, and the requirement is measured by whether an employee can get to the information without asking permission or waiting. Electronic access is permitted only if employees can obtain it immediately and there is a backup means. Corrective action: place a duplicate SDS set or an accessible terminal at the mixing bench, unlock the office copy, and add the primer to the written hazard communication program's chemical inventory before the next spray cycle.
2. The painter's illness occurred after the first use of the new primer. What did 1910.1200 require before painters used it, and what should the training have covered?
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1910.1200(h)(1) requires information and training at the time of initial assignment and whenever a new chemical hazard is introduced into the employee's work area. Introducing an HDI-containing primer is exactly that trigger, so training was required before Tuesday afternoon's first spray, not after the Thursday clinic visit. Continuing to use the product without training compounds the exposure-control problem and undermines any later defense that the employer exercised reasonable diligence.
Under 1910.1200(h)(2), the training had to cover: methods and observations that may be used to detect the presence or release of the chemical (visible mist, odor threshold limits, monitoring); the physical and health hazards, including respiratory sensitization and asthma; the protective measures employees can take, such as local exhaust ventilation, keeping the booth under negative pressure, skin protection, and the respirator program requirements; and the details of the written hazard communication program, including how to obtain and use the SDS and labeling information. Training must be delivered in a manner and language employees understand.
Documentation matters: record employee names, the date, and the content. Stop the spraying operation until training is complete, and repeat the training whenever a new hazard is introduced.
3. Evaluate the respirator situation against 1910.134. What must the employer do before any painter wears the half-mask again?
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Respirators are being used to control an isocyanate exposure, so this is required use and the full 1910.134 program applies unless air monitoring and controls show respirators are unnecessary. Deficiencies and required fixes:
- Written program (c): written worksite-specific procedures covering selection, medical evaluation, fit testing, use, maintenance, and cartridge change.
- Medical evaluation (e): required before fit testing or respirator use, using the questionnaire in Appendix C or an equivalent, reviewed by a physician or other licensed health care professional; the employer must not receive the questionnaire responses.
- Fit testing (f): annual, for each respirator make, model, and size, using an OSHA-accepted protocol. Employee-purchased respirators with no fit test provide unknown protection.
- Facial hair (f)(2)(i): nothing may interfere with the valve function or facepiece sealing surface. A full beard disqualifies that painter from tight-fitting respirators; move him to a loose-fitting powered air-purifying respirator or a different assignment.
- Cartridge change schedule and training (k): isocyanates have poor warning properties, so a time-based change schedule and end-of-service-life planning are essential.
Also verify that half-mask APR protection is adequate for measured exposure under 1910.134(d) assigned protection factors, and rely on engineering controls first.