Chemflake Special

Product description

A high build glass flake reinforced vinyl ester coating, specially designed for high temperature service.

Recommended use

Steel in aggressive environments. For maximum corrosion and chemical protection also in high temperature environment. May also be used for protection of aluminium and concrete (special designed systems).

Film thickness and spreading rate

                                                                                  Minimum                       Maximum                        Typical

Film thickness, dry (µm)                                        600                                1000                                  750

Film thickness, wet (µm)                                       650                                1080                                  800

Theoretical spreading rate (m²/l)                        1,55                                 0,93                                 1,24

Comments

All vinyl ester and polyester resin systems are subject to some shrinkage during the curing process. This results in a practical spreading rate lower than the theoretically calculated. The shrinkage depends on actual dry film thickness applied and conditions during application.

Physical properties

Colour Red, White

Solids (vol %)* 96 ± 2

Flash point 34ºC ± 2 (Setaflash)

VOC 36 gms/ltr UK-PG6/23(97). Appendix 3

Gloss Semiflat

Water resistance Excellent

Abrasion resistance Excellent

Solvent resistance Excellent

Chemical resistance Excellent

Flexibility Limited

*Theoretically calculated

Surface preparation

All surfaces should be clean, dry and free from contamination. The surface should be assessed and treated in accordance with ISO 8504.

Bare steel

Cleanliness: Blast cleaning to min. Sa 2 ½ (ISO 8501 1:2007). Roughness: use suitable abrasives to achieve Grade Coarse G (75 - 130 µm, Ry5) (ISO 8503-2).

Other surfaces

The coating may be used on other substrates. Please contact your local Jotun office for more information.

Condition during application

The temperature of the substrate should be minimum 15°C and at least 3°C above the dew point of the air. The temperature and the relative humidity should be measured in the vicinity of the substrate. Good ventilation is usually required in confined areas to ensure proper drying. The coating should not be exposed to oil, chemicals or mechanical stress until fully cured.

Application methods

Spray Use normal airless spray or two-comp. airless spray equipment

Brush Recommended for stripe coating and small areas, care must be taken to achieve the specified dry film thickness.

Application data

Mixing ratio (volume) Choose quantity of peroxide, accelerator and inhibitor according to the table

below. Inhibitor and accelerator must be thoroughly mixed with Chemflake Special before adding the required amount of peroxide. Mechanical agitation for one minute or more.

Note:

Check temperature of pump during application. Friction in piston may cause increase in temperature. If this should happen, get the product out as quickly as possible.

If the temperature is ranging near the max. temperature in a zone, it is recommended to reduce the content of peroxide/accelerator respectively, or to increase the content of inhibitor.

Approved alternatives to Norpol Peroxide can be used. Please contact Jotun, Technical Service Department.

Warning:

Accelerator 9802 and peroxide must never be mixed directly together. Be sure that steel temperature is equal or higher than paint temperature.

Steel and paint temperature:

40º C ---------------------------------------------------------

0.2 vol% ( 30 ml) NORPOL Inhibitor 9853

1.4 vol% (225 ml) NORPOL Accelerator 9802

0.6 vol% (100 ml) NORPOL Accelerator 9826

2.2 vol% (350 ml) NORPOL Peroxide 1 or 11 35º C ----------------------------------------------------------

1.40 vol% (225 ml) NORPOL Accelerator 9802

0.6 vol% (100 ml) NORPOL Accelerator 9826

2.2 vol% (350 ml) NORPOL Peroxide 1 or 11 30º C ----------------------------------------------------------

1.75 vol% (280 ml) NORPOL Accelerator 9802

0.6 vol% (100 ml) NORPOL Accelerator 9826

2.2 vol% (350 ml) NORPOL Peroxide 1 or 11 25º C ----------------------------------------------------------

2.0 vol% (320 ml) NORPOL Accelerator 9802

0.6 vol% (100 ml) NORPOL Accelerator 9826

2.5 vol% (400 ml) NORPOL Peroxide 1 or 11 20º C -----------------------------------------------------------

2.25 vol% (360 ml) NORPOL Accelerator 9802

0.6 vol% (100 ml) NORPOL Accelerator 9826

2.5 vol% (400 ml) NORPOL Peroxide 1 or 11 15º C -----------------------------------------------------------

 

Pot life (23°C) 35 - 45 minutes.

Thinner Styrene. Max 5% Styrene.

Cleaner Jotun Thinner No. 17/23/27.

Guiding data airless spray

Pressure at nozzle 15 - 25 MPa (150-280 kp/cm², 2100-4000 psi.).

Ratio/Capacity: > 45:1. Min. 12 l per minute. Slow moving piston.

Nozzle tip 0.86 - 1.14 mm (0.034 - 0.045”).

Spray angle 40 - 80°

Filter To be removed.

Note For further details please see separate "Working Manual".

Drying time

Drying times are generally related to air circulation, temperature, film thickness and number of coats, and will be affected correspondingly. The figures given in the table are typical with:

• Good ventilation (Outdoor exposure or free circulation of air)

• Typical film thickness

• One coat on top of inert substrate

 

Substrate temperature	15°C	23°C	40°C
Surface dry	8 h	4h	2 h
Through dry	8 h	4h	2 h
Cured	8 d	4d	2 d
Dry to recoat, minimum Dry to recoat, maximum 1	8h 36h	4h 24h	2h 12h

1. The surface should be dry and free from any contamination prior to application. If the maximum dry to recoat time is exceeded, please contact Jotun for advice

The given data must be considered as guidelines only. The actual drying time/times before recoating may be shorter or longer, depending on film thickness, ventilation, humidity, underlying paint system, requirement for early handling and mechanical strength etc. A complete system can be described on a system sheet, where all parameters and special conditions could be included.

Typical paint system

On steel:

Chemflake Special 2 x 750 µm (Dry Film Thickness)

Holiday detector after last coat: NACE RPO 188-88. (400 volt per 100 µm)

Tankguard Holding Primer 1 x 40 µm can be used as a temporary protection before the full system is applied.

Other systems may be specified, depending on area of use

Storage

The product must be stored below 25°C and in accordance with national regulations. Storage conditions are to keep the containers in a dry, cool, well ventilated space and away from source of heat and ignition. Containers must be kept tightly closed.

SHELF LIFE: 4 months, at 23°C, subject to re-inspection therafter. Shelf life very much depends on tempeature. Lower temperatures (if possible below freezing point) will lengthen the shelf life considerably, while high temperature may lead to gelling in the tin.

Accelerator and peroxide must be kept in their original containers. No other materials shall be stored in the same room as peroxides.

Always consult your local/national authorities for storing peroxides!

Handling

Handle peroxide with care. Avoid that it comes in contact with flameable substances. Accelerator and peroxide must never be mixed directly together. Before handling, see safety data sheet for accelerator and peroxide.

Packing size

20 litre unit: 16 litres in a 20 litre container .

Health and safety

Please observe the precautionary notices displayed on the container. Use under well ventilated conditions. Do not breathe or inhale mist. Avoid skin contact. Spillage on the skin should immediately be removed with suitable cleanser, soap and water. Eyes should be well flushed with water and medical attention sought immediately.