Table 4. 2011 Volatile Organic Compounds assessment results.

Operator	Process	Total time worn/min exposed	TWA (ppm)	TWA Exposure Standards (maximum allowed)
P&O technician	• Sealing orthotic casts using methylated spirit • Using 3M Super 77 Spray Adhesive • Mixing and applying Eco-Lam Resin and sealing resin • Grinding and gluing using Foss Adhesive	474	Methyl Methacrylate=ND Ethyl Alcohol=0.37 ppm Toluene=ND Xylenes=ND MEK=ND Acetone=ND	50 ppm 1,000 ppm 50 ppm 80 ppm 150 ppm 500 ppm
Orthotist	• Plaster Work • Gluing orthoses using toluene-based glue • Grinding Orthoses • Patient clinics • Office work	471	Methyl Methacrylate=ND Ethyl Alcohol=0.54 ppm Toluene=ND Xylenes=ND MEK=ND Acetone=ND	50 ppm 1,000 ppm 50 ppm 80 ppm 150 ppm 500 ppm
Prosthetist	• Cleaning using Foss Solvent • Cast modification using builder’s oxide, shellac • Gluing orthoses using Foss Adhesive and solvent • Patient Review	493	Methyl Methacrylate=ND Ethyl Alcohol=1.85 ppm Toluene=ND Xylenes=ND MEK=ND Acetone=ND	50 ppm 1,000 ppm 50 ppm 80 ppm 150 ppm 500 ppm
Orthotist	• Making toe prop using Orthoform 2-part silicone • Gluing shoe raise using 12D Adhesive	473	Methyl Methacrylate=ND Ethyl Alcohol=0.54 ppm Toluene=ND Xylenes=ND MEK=ND Acetone=ND	50 ppm 1,000 ppm 50 ppm 80 ppm 150 ppm 500 ppm

ND=Not Detected

No other specific VOC’s were detected in any of the samples