Which Chemicals Require an Eyewash Station? A Practical Risk Assessment

Short answer: OSHA 29 CFR 1910.151(c) requires suitable facilities for quick flushing wherever employees may be exposed to injurious corrosive materials. In practice that means any substance classified under GHS as Skin Corrosion or Serious Eye Damage, plus strong irritants handled in open systems - and hydrofluoric acid, which needs a specific protocol beyond water.

Start with the SDS, not the label

Two sections of the safety data sheet decide the question:

• Section 2 (Hazard identification) - look for H314 (causes severe skin burns and eye damage), H318 (causes serious eye damage), and H315/H319 for irritation.

• Section 10 (Stability and reactivity) - identifies incompatibilities that turn a mild material into a violent one when mixed.

H314 and H318 are the clear cases. H319 alone (serious eye irritation) is a judgement call that depends on quantity, frequency and whether the material is handled open or closed.

The usual suspects

Hydrofluoric acid is not a water-only problem

HF burns are not caused by acidity alone. Fluoride ions penetrate tissue and bind calcium, causing deep damage that may not be painful for hours. Water flushing is still the first action, but the site also needs a specific response protocol - typically calcium gluconate gel and immediate medical referral - plus training that everyone in the area can recite.

If HF is present, the eyewash is necessary but not sufficient. Do not let a compliant station create the impression that the hazard is covered.

Where people get the assessment wrong

Small quantities. A 100 ml bottle of concentrated acid on a bench is still a facial splash risk. Quantity affects the consequence, not the classification.

Closed systems. A sealed transfer line reduces routine exposure, but maintenance and sampling break containment. Assess the tasks, not the piping diagram.

Cleaning chemicals. CIP and sanitising agents are frequently the most corrosive materials on site, and they are handled by the people least likely to have read the SDS.

Frequently asked questions

Does every laboratory need an eyewash?

Any laboratory where corrosive or severe eye-damage materials are used needs one within 10 seconds' travel. Small teaching labs included.

Is a personal eyewash bottle enough?

No. Bottles are supplementary. They cannot deliver a 15-minute hands-free flush.

What about a substance not classified as corrosive?

Assess severe irritants and sensitizers by task. If a splash to the face is credible and the outcome could be serious eye damage, the station is justified regardless of the label.

How many stations does one plant need?

One per hazard zone, such that every exposed worker can reach one in 10 seconds. This usually means more units than headcount suggests.

Turning the assessment into a specification

Once the hazard list exists, the equipment choice is straightforward: unit type by exposure, material by chemistry, climate protection by location. Send us the chemical list and we will map it to a configuration - see the eyewash station range or the laboratory equipment line.

Sources: OSHA 29 CFR 1910.151(c); GHS hazard statements H314/H318/H319; ANSI/ISEA Z358.1-2014; published HF exposure guidance.