Tankguard Holding Primer

Product description

This is a two-component, novolac epoxy coating which gives temporary protection of steel and ensures good adhesion to the next coat.

Recommended use

Holding primer for typically the internal lining of steel storage tanks. Temporary protection of steel before application of full systems of e.g. Tankguard Storage, Tankguard SF, Chemtech GM, Chemflake Special and Chemflake Classic. Not compatible with Tankguard DW and Tankguard 412.

Film thickness and spreading rate

                                                                                                  Minimum                       Maximum                           Typical

Film thickness, dry (µm)                                                         20                                    60                                      40

Film thickness, wet (µm)                                                        50                                   140                                     95

Theoretical spreading rate (m²/l)                                         6,7                                   4,2                                       5

Physical properties

Colour Buff

Solids (vol %)* 43 ± 2

Flash point 28ºC ± 2 (Setaflash)

VOC 4 lbs/gal (480 gms/ltr) USA-EPA Method 24

Gloss Flat

Water resistance Very good

Solvent resistance Excellent

Chemical resistance Excellent

Flexibility Fair

*Measured according to ISO 3233:1998 (E)

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: using abrasives suitable to achieve Grade Medium G (50 - 85 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 10°C and at least 3°C above the dew point of the air, temperature and relative humidity measured in the vicinity of the substrate. Good ventilation is required in confined areas to ensure proper drying. The coating should not be exposed to oil, chemicals or mechanical stress until cured.

Application methods

Spray Use airless spray

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

Application data

Mixing ratio (volume) 7:1

Mixing 7 parts Comp. A (base) to be mixed thoroughly with 1 part Tankguard Holding Primer, Comp. B (curing agent)

Induction time 20 minutes.

Pot life (23°C) 4 hours (Reduced at higher temp.)

Thinner/Cleaner Jotun Thinner No. 23

Guiding data airless spray

Pressure at nozzle 15 MPa (150 kp/cm², 2100 psi)

Nozzle tip 0.46-0.69 mm (0.018-0.027")

Spray angle 40-80°

Filter Check to ensure that filters are clean.

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

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

   Tankguard Holding Primer must be recoated no later than: 2 months with Tankguard SF

   4 months with Chemflake Classic, Chemflake Special

   6 months with Tankguard HB, Tankguard Storage, Chemtech GM Clear

    

2. In order to achieve full product resistance, a combined total of 14 days curing at minimum 15ºC is required during build period.

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

Tankguard Holding Primer 1 x 40 µm (Dry Film Thickness)

Followed by a full tank coating system.

Other systems may be specified, depending on area of use

Storage

The product must be stored 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.

Handling

Handle with care. Stir well before use.

Packing size

20 litre unit: 17.5 litres Comp. A (base) in a 20 litre container and 2.5 litres Tankguard Holding Primer, Comp. B (curing agent) in a 3 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.