# Safety Hazards & Protective Gear Part of the Composite Materials Merit Badge Digital Resource Guide: [Introduction & Overview](https://merit-badge.university/merit-badges/composite-materials/guide/index.md) *1. Safety & Responsibility* > **1a.** Explain to your counselor the most likely hazards you may encounter while working with composite materials and what you should do to anticipate, mitigate, and prevent, and respond to these hazards. Describe the appropriate safety gear and clothing that should be used when working with composite materials. A single drop of uncured epoxy resin on bare skin might not look like a big deal — but repeated exposure can trigger a lifelong allergic reaction that means you can never work with epoxy again. Composite materials produce real chemical and physical hazards, and understanding them before you start is not optional. It is the foundation everything else in this badge builds on. ## The Major Hazards ### Chemical Exposure Resins (epoxy, polyester, vinyl ester) contain chemicals that irritate skin, eyes, and the respiratory system. Some components — like the hardeners in epoxy systems — are **sensitizers**, meaning they can cause your immune system to overreact. Once you become sensitized, even tiny amounts of exposure can trigger severe allergic dermatitis (a painful, itchy rash) or breathing difficulties. This sensitization is permanent. Solvents used to clean tools and thin resins (acetone, methyl ethyl ketone) evaporate quickly and produce vapors that can cause headaches, dizziness, and nausea. In a poorly ventilated space, these vapors build up fast. > **Safety First!** > > Sensitization to epoxy is **irreversible**. Once your body develops an allergic response, you will react to even trace amounts for the rest of your life. This is why barrier protection — gloves, long sleeves, and avoiding any skin contact — is non-negotiable from the very first time you handle resin. ### Airborne Fibers and Dust Cutting, sanding, or grinding fiberglass, carbon fiber, or aramid produces tiny fiber fragments and dust. Glass fibers cause itching and skin irritation on contact. Carbon fiber dust irritates the lungs. Aramid fibers can cause respiratory problems with prolonged exposure. Sanding cured composites is particularly hazardous because it generates fine particles that stay airborne for a long time. ### Heat and Exothermic Reactions When resin and hardener are mixed, they undergo a chemical reaction that generates heat. If too much resin is mixed at once or the mixture is left in a container rather than spread thin, the temperature can climb high enough to melt the mixing cup, produce toxic fumes, or even start a fire. This is called an **exothermic reaction** — "exo" means outside, "thermic" means heat. ### Sharp Edges and Splinters Cured composite materials can produce razor-sharp edges when cut or broken. Fiberglass splinters are especially irritating because the tiny glass fragments embed in skin and are nearly invisible. > **Did You Know?** > > Carbon fiber dust is electrically conductive. In a workshop with exposed electronics, airborne carbon particles can cause short circuits in computers, outlets, and electrical panels — a hazard most people never think about. ## Your Protective Gear The right safety equipment creates a barrier between you and every hazard listed above. Here is what you need and why. ### Eye Protection Wear **safety glasses with side shields** at all times when cutting, sanding, or mixing. If you are working with liquid resins or solvents, switch to **chemical splash goggles** that seal against your face. Standard glasses leave gaps where splashes can reach your eyes. ### Respiratory Protection Use a **NIOSH-approved respirator** with organic vapor cartridges when mixing or applying resin. For sanding and cutting cured composites, a **P100 particulate filter** respirator traps fine dust and fiber fragments. A simple dust mask is not enough — the particles from composite work are too small for basic masks to catch. ### Skin Protection Wear **nitrile gloves** (not latex, which some resins dissolve). Use **disposable coveralls or a long-sleeve work shirt** to keep fibers and resin off your arms. Tuck sleeves into gloves. If you are sanding, wear a long-sleeve shirt with a snug collar to keep fibers from reaching your neck and chest. ### Hand and Body Protection Wear closed-toe shoes — never sandals. If you are doing extended sanding, a **disposable Tyvek suit** keeps fiber dust off your clothes and skin. Barrier creams applied to exposed skin before work make cleanup easier and add another layer of protection. **Personal Protective Equipment (PPE) Checklist** — Have all of these ready before you start any composite work - [ ] Safety glasses with side shields (or chemical splash goggles for resin work) - [ ] NIOSH-approved respirator with organic vapor and P100 cartridges - [ ] Nitrile gloves (have extras — change them when torn or contaminated) - [ ] Long-sleeve shirt or disposable coveralls - [ ] Closed-toe shoes - [ ] Barrier cream for exposed skin areas ## Anticipate, Mitigate, Prevent, Respond Your counselor will want to hear you use these four words — and understand what each one means in the context of composites work. - **Anticipate:** Before you start, identify what could go wrong. Is the ventilation adequate? Do you have the right gloves? Is the fire extinguisher accessible? Think through the job before you pick up a single tool. - **Mitigate:** Reduce the severity of hazards you cannot eliminate. You cannot make resin non-toxic, but you can work in a ventilated area, wear a respirator, and mix only small batches at a time. - **Prevent:** Take actions that stop hazards from occurring. Keep resin containers sealed when not in use. Wet-sand instead of dry-sand to keep dust out of the air. Never eat or drink in the work area. - **Respond:** Know what to do when something goes wrong. If resin contacts your skin, wash immediately with soap and water (not solvent, which drives chemicals deeper). If someone inhales excessive fumes, move them to fresh air. Know where the eyewash station and first aid kit are before you need them. > **Be Prepared! Resin Spill on Bare Skin** > > You are laying up fiberglass and a glob of mixed epoxy lands on your forearm above your glove. > > - **Do not** use acetone or solvent to wipe it off — solvents open your pores and push the chemicals deeper into your skin. > - **Do** wipe off the excess with a dry paper towel immediately. > - **Then** wash the area thoroughly with soap and warm water. > - **If** redness, itching, or swelling develops, stop work and inform your counselor. Seek medical attention if symptoms persist or spread. > - **Document** the exposure — your counselor needs to know, and an SDS (covered in [Req 1c](https://merit-badge.university/merit-badges/composite-materials/guide/req1c/)) will tell medical providers exactly what chemicals were involved. ![Personal protective equipment for composites work laid out on a workbench: safety glasses, respirator with cartridges, nitrile gloves, and long-sleeve work shirt](https://ik.imagekit.io/doulacoop/tr:w-800/mbu-assets/merit-badges/composite-materials/guide/ppe-composite-worker?v=36a00afb) Video: [Fibreglass Safety 101](https://youtu.be/tXmTLRSMZSM) [OSHA — Composite Materials Safety Guidelines](https://www.osha.gov/composite-materials): Federal safety standards and best practices for working with composite materials in various settings. Now that you know the hazards and the gear that protects you, the next step is understanding how to handle, store, and dispose of the chemicals you will be working with. --- - Previous: [Introduction & Overview](https://merit-badge.university/merit-badges/composite-materials/guide/index.md) - Next: [Handling, Storage & Disposal](https://merit-badge.university/merit-badges/composite-materials/guide/req1b/index.md)