Spua Potable Water Anticorrosion Waterproof Polyurea Coating Material for Tank

  STWD900 SPUA potable water anticorrosion waterproof coating is a polymer reacted by Isocyanate (party A) and Amino compound (party B). The technical formulation is imported from STWD Urethane Company, the raw materials and production process adopted are harmless and toxic free, it meets the requirements of Standard Specification for Potable Water Products and gained   License Number of Health permit of Ministry of chemical industry. The operative norm is (Jiangsu) sanitary water (2016) number 3200-0005. Following the high-solids coatings, waterborne coatings, radiation curable coatings, powder coatings and other low (no) pollution coating technologies, Spray Polyurea Elastomer (short as SPUA) technology is a new solvent-free, pollution-free green application technology which is developed to meet environmental requirements in nearly two decades abroad. It has been used in drinking water pipelines, storage tanks and water tanks that meet the food standards, with its outstanding waterproof, anticorrosion and protective capabilities, as well as environmental protection, pollution-free sanitary performance.
                     

Characteristics           
The product has high reactivity, complete chemical reaction, no harmful substances in the cured film, also with no chemical precipitation in actual use. Rapid cure, can be sprayed forming on any bent, slope and vertical surfaces without sagging. Dense and seamless coating, completely isolated from air, water, and other media infiltration or penetration. It has excellent adhesive strength and impact resistance, combines good anticorrosion waterproof, abrasion resistance, anti-aging and safe environment protection performance. The hardness is adjustable to meet high elasticity and high ductility or high hardness and high strength support requirements.
                       

Characteristics
Adhesive strength (concrete base)                  ≥2.9 Mpa( or substrate broken)
Adhesive strength (steel base)                        11.3 Mpa
Tear strength                                                    80.6kN/m
Tensile strength                                               17.8Mpa
Elongation                                                        472%
Hardness                                                         Shore A ~ Shore D
Penetrate resistance                                          2.3Mpa
Temperature variation                                      -40------+120ºC
Wear resistance (750g/500r)                               5mg
Acid resistance (10%H₂SO₄ or 10%HCI, 30d)          no rust no bubbles no peel
Alkali resistance 10%NaOH, 30d                       no rust no bubbles no peel
Salt resistance 60g/L, 30d                                  no rust no bubbles no peel
Salt spray resistance 1000h                              no rust no bubbles no peel
Hygienic performance                                         conforms to the regulation for the evaluation of protective materials for drinking water, issued by Sanitary license approval [2001]161
                         
Data of performance
Color                                    White
Luster                                  glazed
Density                                1.01g/cm³ 
Volume solid content           99% ±1%
VOC                                        0
Recommended dry film thickness   1000-3000μm
Theoretical coverage            2.04kg/sqm (calculated by the above solids percentage and dry film thickness of 2000 microns)
Practical coverage               Allow appropriate loss rate
Dry time                                5-20s solid dry time: 20 min
Overcoating interval             min: 1h, max: 24h
Overcoating method            Special polyurea equipment spray (imported or local support)
Flash point                             200ºC
Application environment

1. Agitate part B uniform prior to application, thoroughly mix the deposited pigments, or the product's quality will be affected.

1. Spray polyurea within the proper time if the substrate surface is primed. For the application method and interval time of STWD polyurea speical primer please refer to STWD company's other brochure.
2. Always apply STWD900 on a small area before large application to check the mix ratio, color and spray effect are correct. For detailed information of application please refer to the latest instruction sheet of the application instructions of STWD spray polyurea series.

Note: the curing time varies with the environment condition especially the temperature and relative humidity.

Shelf Life
* From the manufacturer date and on original package sealed condition:
Part A: 10 months
Part B: 10 months
*storage temperature:+5-35°C
Packing: Part A 220kg/drum, part B 200kg/drum
Make sure the product package sealed well
* store in cool and ventilated place, avoid direct sunshine exposure.

Product health and safety information  
For information and advice on the safe handling, storage and disposal of chemical products, users shall refer to the most recent Material Safety Data Sheet containing physical, ecological, toxicological and other safety related data.

Integrity declaration   
STWD guarantees all technical data stated in this sheet are based on laboratory tests. Actual testing methods may vary due to different circumstances. Therefore please test and verify its applicability. STWD does not take any other responsibilities except the product quality and reserve the right of any modifications on the listed data without prior notice.