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Pipe Doctor Health and Safety (Page Two)

9. Physical and Chemical Properties

Component A - Turbid and odourless liquid.

Component B - Dark brown liquid at room temperature with earthy/ musty odour

  • Temperature of decomposition >260°C (Literature data)
  • Density 1.20 - 1.25 g/cm3 (20°C)
  • Viscosity 150 - 500 mPa.s (20°C)
  • Vapor pressure <10 -5 mbar (20°)
  • Solubility (Water) Not applicable: Reacts with water
  • Partition coefficient N/A
  • PH (1% solution) N/A
  • Flash point >200°C (Literature data)
  • Ignition temperature >400°C (Literature data)
  • Explosion limits not determined

10. Stability and Reactivity

Component A - No decomposition when used for intended purpose. Highly exothermic reaction with acids.

Component B - Stable under normal conditions but protect from humidity. No decomposition when used for intended purpose. Conditions to avoid: Humidity, alcohols, amines, strong bases. Polymerization produces gases which may burst closed or confined containers. Decomposition products: CO, NOx, HCN.

11. Toxicology Information

Component A - Component may cause irritation to skin and mucous membranes, together with serious eye injury if in contact

Component B - For the Diphenylmethane Diisocyanate

  • LC50 (inhalation, rat): 178 mg/m3 ; 370 mg/m3 as aerosol of 4 hours exposure
  • The LD 50 for skin absorption in rabbits is >2000 mg/kg
  • Single dose oral toxicity on rats: > 15000 mg/kg
  • Skin irritation: yes
  • Eye irritation: yes

Sub acute and chronic toxicity:

  • No effect level (NOEL): 0.2 mg/m(inhalation of aerosols)
  • Lowest effect level (LOEL): 1.0 mg/m(inhalation of aerosols)

Mutagenicity data on MDI are inconclusive. MDI was weakly positive in some vitro (test tube) studies; others proved to be negative. A mutagenicity study in animals was negative.

Carcinogenicity Data
The ingredient(s) of this product is (are) not classified as carcinogenic by ACGIH (American Conference of Governmental Industrial Hygienists) or IARC (International Agency For Research on Cancer), not regulated as carcinogens by OSHA (Occupational Safety and Health Administration) and not listed as carcinogens by NTP (National Toxicology Program).

MDI is not classifiable as to its carcinogenicity to humans (IARC). There is evidence that a break-down (hydrolysis) product of MDI, 4,4'-methylene dianiline, is carcinogenic in rats and mice.

IARC evaluation: There is no adequate data for evaluating the carcinogenicity of 4,4'- methylene dianiline to humans.

Other cancer information
Lung tumours have been observed in laboratory animals exposed to aerosol droplets of MDI/Polymeric MDI (6 mg/m3) for their lifetime. Tumours occurred concurrently with respiratory irritation and lung injury. 0.2 mg/mconcentration is considered as the "no-effect level".

Current exposure guidelines are expected to protect against these effects. According to available information, the ingredients have not been found to show reproductive toxicity, teratogenicity, mutagenicity or synergistic toxic effects with other materials.

Experience on humans:
No detrimental effects to health are known where the product is handled properly and industrial hygiene precautions are observed. Acute exposure is characterized by the irritation of the respiratory tract causing runny nose, sore throat, coughing, chest discomfort, shortness of breath and reduced lung function. Overexposure may lead to bronchitis, bronchial spasm and pulmonary edema. Chronic exposure may lead to sensitization or asthmatic attack in certain individuals, with the symptoms being chest tightness, wheezing, coughing and shortness of breath.

12. Ecological Information

Component A - Low hazard. Prevent penetration into groundwater, surface waters or sewers.

Component B - Immiscible in water. Reacts with water to form insoluble polyureas. Polyurea is inert and non-degradable. Ecotoxic effect on:

  • Daphnia: EL/LC50 : > 1000 mg/l
  • Bacteria: EC/LC50 : > 10000 mg/l
  • Fish: EC/LC50 : > 10000 mg/l

For Pipe Doctor Health and Safety Information, points 1-8, please click here.

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