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Transpoxy Masterbond BT 4.68

Product Overview
Transpoxy Masterbond BT 4.68 is a high solids primer / topcoat with excellent anti-corrosion performance, excellent impact resistance and wear resistance. It also has excellent adhesion to steel surfaces treated to ISO standards Sa1 or St2 . It is a low surface treatment paint and can be used on most types of old coatings and can be cured at 0 ℃. The product is used in ship ballast tanks and has passed GL certification in accordance with IMO MSC. 215 (82) specifications .
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Description

Physical properties

Color / Glossy reddish brown , grey / Matt

Volume solid content 80%

Flash Point >25 ℃

Volatile organic components ( VOC ) approx. 179 gram / L

Density per litre 1.41 g / centimeter 3



Dry film thickness ( μm )

Wet film thickness ( μm )

Theoretical coating rate

( m2 / L )

Film thickness range

100 – 250

125 – 315

8 – 3.2

Recommended film thickness

160

200

5


Construction instructions

Mixing ratio base material : curing agent = 82 ∶ 18 (weight ratio ) base material : curing agent = 75 ∶ 25 (volume ratio )

Applicable time after mixing at 10 ℃: 3 Hours , 23 °C: 2 Hours , 30 °C: 1 Hour

Airless spray nozzle pressure : 18-25 MPa 

Nozzle aperture : 0.41-0.58 mm 

Spraying angle : 40-80 Spend

Dilution ratio: 0-5% (volume ratio)

Brush or roller coating is only recommended for pre-coating and small area coating , but the specified dry film thickness must be achieved. 

Dilution ratio: 0-10% (volume ratio )

Thinner / Cleaning Agent 603 Epoxy Thinner

It is recommended to add an appropriate amount of diluent after mixing components A and B of the paint evenly.

Avoid adding excessive amounts of thinner, which will reduce sag resistance and extend curing time.


Drying time and time between recoating (1)

Substrate temperature

 Dry time

 Working time

 Fully cured

Recoating interval (2)

Shortest

longest

( Single component )

longest

( two components )

10 ℃

4 hours

12 hours

8 days

18 hours

6 days

30 days

23 ℃

2 hours

8 hours

5 days

15 hours

4 days

20 days

30 ℃

1 hour

4 hours

3 days

12 hours

2 days

15 days

(1)The data is for reference only. The actual drying time and recoating interval depend on factors such as paint dry film thickness, ventilation, humidity and previous paint.

(2)The surface must be dry and free of dirt before recoating. The adhesion of subsequent coatings is best when the previous coating is completely cured. If the coating is exposed for a long time, the surface must be roughened before recoating to ensure adhesion between the coatings.


Surface treatment

Steel SSPC-SP1 According to the regulations , use solvent to remove all grease on the surface ; remove surface welding residues and grind welds and sharp edges with appropriate methods ; sandblast until Sa2.5 Level ( ISO 8501:1 ). The steel surface should be painted immediately after being sandblasted to the specified requirements .

Repairing the corroded part must first be polished with electric tools until St2 Grade or sandblasting to Sa1 or better

( ISO8501:1 ), the surface must be dry before overcoating and free of loose coatings, salt, grease and other contaminants.


Construction conditions

The surface temperature of the substrate shall not be lower than 5 °C and at least 3 °C higher than the air dew point temperature, and the relative humidity shall not exceed 85% (the temperature and relative humidity shall be measured near the substrate).

The surface temperature of the substrate should not exceed 40°C . Otherwise, a suitable spraying method should be selected and appropriate diluent should be added as required to prevent dry spraying. In extreme cases, the dry film thickness of the coating can be appropriately reduced to prevent sagging.

When painting in a confined space, appropriate ventilation equipment must be provided to ensure the cure of the paint film.

After the base material and curing agent are mixed, the temperature must be higher than 15 ℃, otherwise a diluent should be added to achieve the required viscosity for construction.


Recommended Package

The following are typical coating systems exposed to air:

TO4.67 Epoxy Rust Paint 2 × 125μm (dry film thickness ) Subsequent coatings can be epoxy , polyurethane series products or additional coatings as specified .


Store

Must be stored in accordance with national regulations. The storage environment should be dry, cool, well-ventilated, avoid high temperatures and stay away from fire. The packaging container must be kept sealed. The storage validity period is at least 12 months.


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