Home > Services > Certification > Precious Metals Hallmarking
 

Precious Metals Hallmarking

A division of STS, the Singapore Assay Office (SAO) is an independent body that tests and certifies precious metal articles such as gold, silver, platinum and palladium. SAO provides assaying, hallmarking and X-Ray Fluorescence Material Analysis services.

Through SAO, hallmarking has been accepted as a voluntary scheme in Singapore. However, many in the jewellery trade realized the importance of the hallmark, especially if they want to export their jewellery overseas. The hallmark assures consumers that the precious metal article conforms to legal standards.

We are an independent and recognized body that test and certifies precious metal articles such as gold, silver, platinum and palladium.  We test and hallmark in accordance to the guidelines established by the Convention on the Control and Marking of Articles of Precious Metals, or other national requirements as required by the manufacturers and traders.

We continuosly works with organizations to protect the interests of consumers of precious metal articles.  We has been appointed by the Consumers Association of Singapore (CASE) to test the purity of precious metal articles purchased for their mystery shopping programme.

We are the prefered laboratory, by gold merchants and manufacturers, for testing the purity of precious metal raw material, e.g. gold bars and ingots.

For more information, please visit http://www.assayoffice.com.sg/


With increasing awareness on environmental impact resulting from industrial activities, our accurate and unbiased analysis will aid companies in their environmental protection commitment & to meet regulatory compliance under the Environmental Protection and Management Act & Environmental Public Health Act.

1. Off-road Diesel Engine (ORDE) Emission Test & Certification

With effect from 01 July 2012, NEA has mandated a regulatory requirement for all off-road diesel engines*, both new and/or used, that are intended for use in Singapore to comply with EU Stage II, US Tier II or Japan Tier II emission standards (tested to ISO 8178). This regulation includes engine power above 560kW.

STS is the first accredited test centre in Singapore to perform the emission test and provide the test certificate conforming to ISO 8178 standards.

*Off-road diesel engines are any equipment or machinery that is equipped with diesel engines as the main or auxiliary prime mover and not registered with the Land Transport Authority (LTA) for use on public roads.

2. Air Emissions Sampling & Analysis
(Referenced to USEPA Test Methods and Other Internationally Recognized Methods and Standards; Compliance Test to Environmental Protection and Management Act 2008 (Air Impurities) Regulations 2001

  • Source Emission Monitoring & Analysis
    o     Acids such as Hydrofluoric Acid, Hydrochloric Acid, Sulfuric Acid and Nitric Acid
    o     Alkaline Dust: Sodium Hydroxide and Potassium Hydroxide
    o     Ammonium  Hydroxide and Ammonia Gas
    o     Dioxins & Furans
    o     Halides & Halogens: Hydrogen Chloride and Gaseous Chlorine
    o     Particulate Matter (PM)
    o     Greenhouse Gases: Oxides of Nitrogen, Oxides of Sulfur, Carbon Monoxide, Carbon Dioxide
    o     Toxic Metals such as Arsenic, Antimony, Cadmium, Chromium, Copper, Lead, Mercury

3. Boiler Performance Tests, Exhaust & Abatement Efficacy Evaluation (Flue Gas Desulfurizing Unit, Electrostatic Precipitator, Cyclone Dust Collector, Acid & Alkali Scrubbers) as well as support for on-line dust / gas meter calibration.

4.  Wastewater Sampling & Analysis
(Referenced to APHA Test Methods and Other Internationally Recognized Methods and Standards; Compliance Test to Environmental Protection and Management Act 2008 (Trade Effluent) Regulations 2005)

  • Trade Effluent – Sewers – Schedule I (30 Parameters)

o  Methylene Chloride, Trichloroethylene, 1,1,1-Trichloroethane, Tetrachloromethane, 1,1,2-Trichloroethane, Toluene, Styrene, Methyl tert-Butyl Ether, C6 to C10 Hydrocarbons, Tetrachloroethylene, Ethylbenzene, Xylene (o,m,p), 1,2,4-Trimethylbenzene, Furan, Tetrahydrofuran, N,N-Dimethylformamide, Benzene, Turpentine, Polybrominated Diphenyl Ether, Isobutanol, Methyl Ethyl Ketone, Methyl Isobutyl Ketone, Isopropyl Ether, Diethyl Ether, Dimethyl Sulfide and Dimethyl Sulfoxide

  • Trade Effluent – Sewers – Schedule II (32 Parameters)

o  pH value, Temperature, Biological Oxygen Demand, Chemical Oxygen Demand, Total Suspended Solids, Total Dissolved Solids, Oil & Grease, Phenol, Detergents, Chloride, Cyanide, Sulfate, Sulfide, Fluoride, Caustic Alkalinity, Mercury, Silver, Arsenic, Boron, Barium, Beryllium, Cadmium, Chromium, Copper, Iron, Manganese, Nickel, Lead, Selenium and Tin

  • Trade Effluent – Watercourse (28 Parameters)

o  pH value, Temperature, Color, Biochemical Oxygen Demand, Chemical Oxygen Demand, Total Suspended Solids, Oil & Grease, Phenol, Detergents, Cyanide, Sulfide, Free Chlorine, Phosphate, Mercury, Silver, Arsenic, Boron, Barium, Cadmium, Chromium, Copper, Iron, Manganese, Nickel, Lead, Selenium, Zinc & Metals in Total

  • Trade Effluent – Controlled Watercourse (36 Parameters)

o  pH value, Temperature, Color, Biochemical Oxygen Demand, Chemical Oxygen Demand, Total Suspended Solids, Total Dissolved Solids, Oil & Grease, Phenol, Detergents, Chloride, Cyanide, Sulfate, Sulfide, Free Chlorine, Phosphate, Nitrate, Mercury, Silver, Arsenic, Boron, Barium, Beryllium, Cadmium, Calcium, Chromium, Copper, Iron, Magnesium, Manganese, Nickel, Lead, Selenium, Tin, Zinc & Metals in Total

5. Cooling Towers Water, Water Fountains and Water Features; Compliance Test to Environmental Public Health Act Regulations 2001

  • Legionella Bacteria
  • Standard Plate Count

6. Recreational Waters such as Swimming Pool Waters, Spas & Jacuzzis

  • Chemicals – Iron, Copper, Chloride
  • Standard Plate Count
  • Legionella Bacteria
  • E. Coli, Total Coliforms & Faecal Coliforms

7. Environmental Baseline Assessment (EBA)
(Referenced to JTC Guidelines and the Dutch Standards for Soil & Groundwater Analysis)

  • Chemical Analysis of Soil & Groundwater Referenced to British Standards and Other Internationally Recognized Methods and Standards

8. Noise monitoring
(Referenced to BA 7445, ANSI S12.19-1996 and Other Internationally Recognized Methods and Standards); Compliance Test to Environmental Protection and Management Act

  • Construction Noise
  • Boundary Noise

9. Restriction of Hazardous Substances (RoHS), Toxicity Characteristic Leaching Procedure (TCLP) and Other Internationally Recognized Methods and Standards to Quantify Hazardous Materials

10. Environmental Assessment Services

  • ISO 14001 / EMS Pre-audit Gap Assessment