Special Anti-Corrosion and Protective Polyurea Coating for Steel Strands of Cable-Stayed Bridges

• CAS No.: Stwd9008
• Color: All Color Can Offer
• Appearance: Liquid
• Main Raw Material: Polyurethane
• Method: Spray
• Level: Primer
• Model NO.: STWD9008
• Drying Method: Air Drying
• Certification: ISO14001, ISO9001
• Formation Mechanism: Conversion Type
• Transport Package: Iron Bucket Packaging
• Specification: 410kg/group
• Trademark: STWD
• Origin: Shanghai, China
• Production Capacity: 80000kg/Day

Product Description

STWD9008 cable-stayed bridge steel strand wires
special polyurea anticorrosion wearable coating

Product descriptions   STWD9008 cable stayed bridge steel strand special polyurea is a 100% solid content aromatic polyurea elastomer. It has been applied on the cable stayed bridges in America, Europe with its excellent anticorroison, abrasion resistance performance. In early 2012, STWD Urethane USA invested a company in China that is STWD Shanghai company, in June 2012, the first batch polyurea for steel strand wires was produced in Shanghai and exported to Europe. In August 2012, Anhui transportation group tested the polyurea application on steel wires that has great effect. STWD steel strand wires polyurea is widely applied in Chinese cable-stayed bridges.

Product features and advantages
*Solvent free, 100% solid content, safe, environmentally friendly and odor free.
*Rapid cure, can be sprayed forming on any bent, slope and vertical surfaces, no sagging.
*Dense coating, seamless, with good flexibility and adhesive strength
*Excellent impact resistance and abrasion resistance
*Excellent corrosion resistance and chemical resistance to acids, alkali, salts etc.
*Excellent anti-aging performance
*Good shock absorbing performance
*Excellent resistance to temperature variation
*Fast cure, application site back to service quickly
*Excellent durability to reduce maintenance cost of service life
*Extend the service life of sprayed structure
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Product Applications
Anticorrosion waterproof protection of various steel wires of bridges.

Products information

Item	A	B
Appearance	Pale yellow liquid	Adjustable color
Specific gravity (g/m³)	1.12	1.05
Viscosity(cps)@25ºC	800	650
Solid content (%)	100	100
Mix ratio(by volume)	1	1
Gel time(second)@25ºC	4-6
Surface dry time(second)	15-40
Theoretical Coverage(dft)	1.08kg/ Film thickness 1mm

Physical properties  

Item	Test standard	Result
Hardness (Shore A)	ASTM D-2240	92
Elongation rate(%)	ASTM D-412	480
Tensile strength(Mpa)	ASTM D-412	19
Tear strength (N/km)	ASTM D-624	67
Impermeability(0.3Mpa/30min)	HG/T 3831-2006	impermeable
Wearable(750g/500r)/mg	HG/T 3831-2006	4.2
Adhesive strength(Mpa)concrete base	HG/T 3831-2006	3.2
Adhesive strength(Mpa) steel base	HG/T 3831-2006	11.5
Density(g/cm³)	GB/T 6750-2007	1.02
Cathodic disbondment [1.5v,(65±5)ºC,48h]	HG/T 3831-2006	≤15mm

Chemical resistance

Acid resistance 10%H2SO4 or 10%HCI,30d	No rust, no bubbles, no peel off
Alkali resistance 10% NaOH, 30d	No rust, no bubbles, no peel off
Salt resistance 30g/L,30d	No rust, no bubbles, no peel off
Salt spray resistance, 2000h	No rust, no bubbles, no peel off
Oil resistance 0# diesel, crude,30d	No rust, no bubbles, no peel off
(For reference: the above data is acquired based on GB / T9274-1988 test standard. Pay attention to the influence of ventilation, splash and spillage. Independent immersion testing is recommended if requires other specific data)

Product application environment

Environment temperature	0ºC-45ºC
Product spray heating temperature	65ºC-70ºC
hose heating temperature	55ºC-65ºC
Relative humidity	≤90%
Dew point	≥3ºC

Product application guide

Recommend spray machine	Polyurea spray equipment
Spray gun	Fusion-air purge or mechanical purge
Static pressure	2300-2500psi
Dynamic pressure	2000-2200psi
Recommend film thickness	1000-3000μm
Recoating interval	≤6h

Application note

1. Agitate part B uniform prior to application, thoroughly mix the deposited pigments, or the product 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 special primer please refer to STWD companies' other brochure.
2. Always apply STWD spray polyurea 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.

Product curing time

Substrate temperature	Dry	Walking intensity	complete solidify
+10ºC	30s	45min	7d
+20ºC	23s	15min	6d
+30ºC	17s	5min	5d

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

Shelf  Life
* From the manufacturer date and on the 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.