Fibreglass reinforced polyester (GRP), the material used for producing the bodies of our waterproof light fixtures, has an excellent resistance against chemicals. However, as the resistance of other plastic components (diffusers, accessories, etc.) is rather limited, it is advisable to consult with the manufacturer before using the luminaires in special environments.

General aspects of PMMA diffusers

Advantages:
  • UV-stable /no visible changes of colour after a Xenon test of 1,000 hours (according to DIN6174)/
  • Light transmission: 91%
  • High surface brilliance and resistance to wear
  • Excellent resistance to weather
  • Resistance against most inorganic chemicals, aliphatic hydrocarbons, fats, oils, metallic salts and many types of gas at room temperature
  • Resistance against diluted non-oxidising organic acids, water, foods, photo chemicals, solvents, anti-leak cements and kits
Disadvantages:
  • Temperature of use: max. 50°C
  • No resistance against steam
  • Cracks on the surface caused by corrosion when exposed to several types of solvents
  • Aromatic hydrocarbons, ketones, alcohols, esters and ethers dissolve PMMA

General aspects of PC diffusers

Advantages:
  • UV-stable /no visible changes of colour after a Xenon test of 1,000 hours (according to DIN6174)/
  • Light transmission: 89%
  • Very good shock resistance, mechanic stability and rigidity
  • Low water intake, good heat resistance
  • Temperature of use: even above 50°C
  • Resistance against mineral acids of not very high concentration, organic acids, watery oxidising and reductive agents, neutral and acidic salt solutions
  • Resistance against aliphatic and cycloaliphatic hydrocarbons, except for methyl alcohol!
Disadvantages:
  • No lasting resistance against hot water inclined to hydrolysis, such water causes damage in them
  • Low resistance against wear and scratches
  • Low resistance against organic compounds (fuels)
  • Sensitivity to cracks caused by potentialcorrosion
  • Low resistance against vibration
  • Bases, ammonia and amines cause harm
  • Several solvents, acetone, benzene, chlorobenzene and coal tetrachloride make them swell
  • Ketones, esters, chlorinated and aromatic hydrocarbons attack them
  • Pyridine, methylene-chloride chloroform, trichloroethane and m-kresol solve them
  • Several chemicals: hexane, n-heptane, benzine, aromatic hydrocarbons, methyl alcohol, ethyl alcohol, isopropyl alcohol, butyl alcohol, ethylene glycol, glycerine, carbon tetrachloride and acetone turpentine may cause cracks of potentialcorrosion!
Details of resistance to chemicals are in a downloadable table.
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