Alternative Coatings for Epoxy Resin

Product Description

STWD900 spray polyurea elastomer
anticorrosion waterproof protective coating

Product Description

 

Descriptions     
STWD900 is a 100% solid content aromatic polyurea elastomer. It has excellent waterproof anticorrosion and abrasion resistance property which has been widely applied in the industrial and commercial filed for the anticorrosion waterproof protection.
               
Product features and advantages
*Solvent free, 100% solids, safe, environmentally friendly and odor free.
*Rapid cure, can be sprayed forming on any bent, slope and vertical surfaces without sagging.
*Dense coating, seamless, with good flexibility.
*
*High adhesive strength, fast bonding well on steel, concrete, wood, glass fibers and other substrates.
*Excellent impact resistance, abrasion resistance
*Excellent anticorrosion and chemical resistance to acids, alkali, salts etc.
*Excellent waterproof performance
*Good shock absorbing performance
*Excellent resistance to temperature variation
*Fast cure, application site back to service quickly
*Excellent durability to reduce maintenance cost for lifelong
*Extend the service life of sprayed structure

Application scopes    Anticorrosion and waterproof protection of construction, chemicals, transportation, metallurgy, electric power, aerospace, marine, shipbuilding and other fields.

Products information

Item	Part A	Part 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/m3, 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 (kN/m)	ASTM D-624	68
Impermeability (0.3Mpa/30min)	HG/T 3831-2006	Impermeable
Wear resistance(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	11.3
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#, 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)

Application environment

Environment temperature	0ºC-45ºC
Product pre-heat temperature	65ºC-70°C
Pipe pre-heat temperature	55ºC-65ºC
Relative humidity	≤90%
Dew point	≥3ºC

Application guide

Recommend spray machine	H-XP3 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'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.

Product curing time

Substrate temperature	Dry	Foot traffic	Solid dry
+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 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.