Docstoc

OIC Signage

Document Sample
OIC Signage Powered By Docstoc
					Development and Update
    SS 494 : Lead and
  Chromate - free Primer
              Dr Lim Chooi Seng
 Convenor of the Working Group on Lead and
  Chromate-free Primer, and Assistant Vice-
President, Testing Group, PSB Corporation Pte
                      Ltd
           Application

Protection of Iron and Steel
Substrates           • Doors & frames
                       •   Railings - guard rails,
                           stair-case
                       •   Bridges & steel
                           structures
                       •   Structural platforms
                           and parts
        Singapore Standard
          PROGRESS
     IN              WITHDRAWN
SS 494 : 2001 Lead   • SS 206 :1978
 and Chromate-         Zinc Chromate
 free Primer for       Primer
 Iron and Steel
 Substrate           • SS 6:1970
                       Red Lead Based
                       Primers for Iron and
                       Steel Surfaces
                        Toxicity
                          Why is lead dangerous?
                          • Lead poisoning - Interferes with
                           normal body functions

                              • red blood cells formation

RED LEAD PAINT                • Alters nerve cells signals

1. Commonly used -            • Destroys brain connections
  cheap and effective           for thinking

2. Prevention of              • mental retardation
  corrosion of iron and
                              • coma and death
  steel substrate
                          Toxicity
Who are affected?
                                Why is Lead a threat?
• Workers
                                •    Accumulates in the
   • Handling pigments               environment
                                •    Accumulates in our
   • Applicators
                                     bodies
   • Removing old paint         •    seriously injure the
                                     brain, nervous
• Pregnant women and children
                                     system, red blood
   • Brain damage in infants         cells and kidneys

   • Slow mental
      development - learning
                       Toxicity
Zinc Chromate               Why is chrome-6 harmful ?
(Hexavalent chromium )      • penetrates all tissues in the
Paint widely used :           body

  •   High anti-corrosion   • readily absorbed from skin,
      performance             lungs and digestive system

  •   Cost effective        • chronic ulceration of skin
                              surfaces (allergic skin
                              reactions)
                            • ingested chromium cause
                              kidney failure
                            • cancers - leukemia and
                              lymphomas
        SS 494 DEVELOPMENT
PRODUCT PERFORMANCE
Is it as effective as red lead or zinc chromate ?
Laboratory test results:

         Anti-corrosive                  Prohesion Test
         Paint                           (600 hours)
         1. Red lead                     Passed
         2. Zinc Chromate                Passed
         3. Lead-chromate-               Passed
             free primer (prototype)
            Natural Weathering
AFTER 4 YEARS OF NATURAL WEATHERING ON PSB
CORPORATION ROOF-TOP

 Red Lead                  Zinc Chromate
 Exposed primer-alone      Exposed primer- alone
 layer showed rusting      layer still holding
        Natural Weathering
PROTOTYPE      Some screened and selected
               prototypes (example) after laboratory
FORMULATIONS   evaluation - showed equal or better
PERFORMANCE    performance than red lead
              Natural Weathering
PROTOTYPE FORMULATIONS PERFORMANCE
Not selected primer pigments (example shown)
showed rusting




 Rust spots
                 Paint Specifications
PHYSICAL PROPERTIES
Differences between SS 494 paint with SS6 and SS 206 are
kept minimal for ease of painting and handling

Properties            Red Lead           Zinc Chromate Pb & Cr-free
                      SS 6               SS 206              SS 494
1. Viscosity          75- 95             68 - 82             75- 95
2. Flash Point        23° C              23 ° C              23 ° C
3. Fineness grind     50 microns         50 microns          50 microns

      Ease of application - One paint to replace 2 toxic products
•     Paint manufacturers - less raw materials to carry
•     Retailers - less stock inventory
•     Managing agents - one but effective system to choose
              Benefits of SS 494
PERFORMANCE                  SAFETY AND ENVIRONMENT
(After natural weathering)   TOXICITY
• Showed equal or better        • lead accumulation in
  than red lead primer            environment minimised
• Comparable to zinc            • Lead exposure minimised
  chromate
                                • No chromate-6
(Laboratory Testing)              carcinogenity
• Passes prohesion              • Chromate-6 chemical
  requirement                     risk minimised
                                • No negative impact of
                                  toxic metals in
                                  environment
              Benefits of SS 494
Housing Board               Paint applicators
Town Councils               Paint manufacturers
Managing Agents             Contractors
Architects                  Site workers
Consultants                 Waste disposal workers
Developers                  • No exposure to toxic
• protection to building      lead and chromate
  structures                  pigments

• Performance and quality   • Negative impact from
                              toxic metals
• Safety for residents        contamination into
                              environment and water
                              table reduced
Bringing
  excellence to business
         and
     business to excellence

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:8
posted:12/17/2011
language:
pages:14