Hardtop Optima

 

 

Product description

Hardtop Optima is a two-pack polysiloxane topcoat with excellent gloss and colour retention.The product is fully recoatable at any stage of curing.

 

 

Recommended use

As topcoat over an epoxy system where a durable, high grade finish is required in aggressive atmospheric exposure.

 

 

Film thickness and spreading rate

 

                                                                              Minimum                    Maximum                    Typical

Film thickness, dry (µm)                                    60                                 100                               75

Film thickness, wet (µm)                                   80                                 130                              100

Theoretical spreading rate (m²/l)                  12,7                                 7,6                              10,1

 

 

Physical properties

Colour Available in white and colours tinted from Multicolor Industry tinting system (MCI)

Solids (vol %)* 76 ± 2

 

Flash point 30ºC ± 2 (Setaflash)

 

VOC 215 gms/ltr UK-PG6/23(97). Appendix 3

 

Gloss Glossy

Gloss retention Excellent

Water resistance Very good

Abrasion resistance Very good

Solvent resistance Good

Chemical resistance Very good

Flexibility Good

*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.

 

Coated surfaces

Clean, dry and undamaged compatible primer. Please contact your local Jotun office for more information.

 

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 5°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 usually 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) 4:1

 

Mixing 4 parts of Comp. A (base) to be mixed thoroughly with 1 part Hardtop Optima, Comp. B (curing agent).

Pot life (23°C) 6 hours (Reduced at higher temp.).

 

Thinner Jotun Thinner No. 7/17

Guiding data airless spray

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

Nozzle tip 0.33-0.46 mm (0.013-0.018").

Spray angle 40-80º

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

 

Substrate temperature	5°C	10°C	23°C	40°C
Surface dry	10h	5 h	3h	2 h
Through dry	12h	7 h	4h	3 h
Cured	15d	10 d	5d	3 d
Dry to recoat, minimum Dry to recoat, maximum 1,2	12h	7 h	4h	3 h

 

1. The surface must be free from any chalking or any other contamination and if necessary, sufficiently roughened prior to application.

2. Provided the surface is free from chalking and other contamination prior to application, there is normally no overcoating time limit. Best intercoat adhesion occurs, however, when the subsequent coat is applied before preceding coat has cured. If the coating has been exposed to direct sunlight for some time, special attention must be paid to surface cleaning and mattening/removal of the surface layer in order to obtain good adhesion.

 

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   Resist 86 or Barrier	1 x 75 µm	(Dry Film Thickness)
Jotamastic Plus Hardtop Optima	1 x 250 µm 1 x 75 µm	(Dry Film Thickness) (Dry Film Thickness)
Barrier 80 Jotacote Universal Hardtop Optima	1 x 75 µm 1 x 130 µm 1 x 75 µm	(Dry Film Thickness) (Dry Film Thickness) (Dry Film Thickness)

 

Note: To obtain full coverage an extra coat may be necessary, especially for signal colours in red, orange and yellow.

Other systems may be specified, depending on area of use

 

 

Storage

The product must be stored above 0°C and in accordance with national regulations, subject to re-inspection thereafter. 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: 16 litres Comp. A in a 20 litre container and 4 litres Hardtop Optima, Comp. B in a 5 litre container. or

5 litre unit: 4 litres Comp. A in a 5 litre container and 1 litre Hardtop Optima, Comp. B in a 1 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.