Techniques

Some explanations:

Anodising
Anodising is the most common way of improving the corrosion resistance of aluminium. During this process the natural layer of oxide is thickened and compressed to 15-20 micron by electrolytic action. This gives a very hard corrosion-resistant layer which is fully transparant and allows the natural aluminium colour to show through.

Coating
For powder coating an electrostatic layer of 60-80 micron of polyurethane paint is applied to the aluminium. The necessity of cleaning is considerably less than for anodised aluminium. An extra advantage is that a repair to the powder coating can be carried out without removing the window.
Gebo ships’ windows are anodised or powder-coated after all machining, thereby preventing corrosion to tapped holes or sawn surfaces.
The operational life of powder-coated or anodised aluminium is increased by regular and correct cleaning.

Aluminium
More and more boat owners are having to replace the glazing on their boats with aluminium windows. Aluminium has a number of advantages over more costly materials such as stainless steel or brass. Most importantly, it allows greater flexibility in design and requires less maintenance.
For these reasons it is the most popular metal for manufacturing marine window frames.
Although bare untreated aluminium has a relatively good corrosion resistance, it is not recommended for a marine environment. To improve their corrosion resistance, aluminium windows are either anodised or powder-coated.

Before you order…

Measuring deckhatches Order directions windows Measuring portlights Order instructions windscreens

Gebo Standard hatch
With flange, corner radius 55mm on cutoutsize.
Without flange, corner radius 30mm on cutoutsize.
Hatches have to be installed on a flat surface with a max. tolerance of 1mm.
The cutout size is 16mm less than the overall size. From the cutout size you can see in the productdatabase which innerrim or mosquito screen fits to which hatch.

Gebo Flushline hatch
With flange, corner radius 42mm on cutoutsize.
Hatches have to be installed on a flat surface with a max. tolerance of 1mm.
The cutout size is 21mm less than the overall size. From the cutout size you can see in the productdatabase which innerrim or mosquito screen fits to which hatch.

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Directions for ordering marine windows
It is esssential that you pay attention to the following points when ordering windows. If you follow all the instructions carefully, we can guarantee a windows that fits exactly. Insufficient information may cause extra work and delay because we will have to contact you to obtain the information we need.

When supplying a template make sure that it fits the window aperture exactly. Use hardboard or similar material which does not shrink or stretch. If paper or cardboard are the only materials available, write as many dimensions as possible, on the template i.e. height and width, so that it can be checked for reference.
When ordering sliding windows the horizontal sides must be parallel. When ordering half-drop windows the vertical sides must be parallel.
The template must be sawn streight without undulation to avoid errors in size.
Please indicate the following details on the template:
- Outside
- Top
- Starboard or port side
- Type of window required
- Type of section, type of surface treatment
- Direction of sliding
- Your name

For each type of section we offer various standard radii. We strongly recommend that only these radii are specified as there is an extra cost for producing a non-standard radius and it will extend delivery time.
For fixing the windows always use stainless-steel materials. If you want us to supply these with the windows, please specify what is required, e.g. bolts and nuts, selftapping screws, etc. Fastenings are not included in the price of the windows.
Delivery time only becomes effective after receipt of your officiel order, templates, and all the information required to manufacture the windows.
Unless otherwise specified in the order, we supply windows with clear toughened glass of approx. 5mm thickness. Should tinted glass be required, please state desired colour. Smoky Grey, Bronze and Green are the standard tinted colours available.
Upon receipt of your order we suggest that every window is checked against the appropiate templates as soon as possible as any claim must be made within four days of delivery.
Accuracy of measurements of windows are only guaranteed if these “directions for ordering marine windows” are followed.
Should you need to fit horns, windscreen wipers, searchlights, etc. through the glass, please indicate the diameter of the axle or the bolt to go through the glass. We will then adjust the actual diameter of the hole to eliminate the possibility of the hole distorting during the glass-toughening process.
We reserve the right to change the construction of the illustrated windows and other articles.
In case you have any questions, please don’t hesitate to call, fax, or email us. We’ll gladly be of assistance.

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Please note the following items:

Is the portlight opening inwards or outwards?
Is the portlight rectangular or circular ended?
Is the opening lid aluminium framed?
What is the outside dimension?
Installation should be on a flat surface with a tolerance of max. 1 mm

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The cutout size is 24 mm less than the overall size. From the cutout size you can see in the productdatabase which rainshield or mosquito screen fits into which portlight.

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