weber.floor 4680 marine light 

weber.floor 4680 marine light is a lightweight polymer modified cement based fine smoothing compound for use as a levelling material on steel, galvanized steel and aluminium decks. It is supplied as a preblended dry powder, water is added on site of construction. The screed is applied by hand and requires only light mechanical handling with a steel spatula or spiked roller to achieve adequate evenness for a floor covering. The material quickly attains a high surface strength and is walkable after 24 hours. Final covering can be done after 13 days. Note that the curing time depends on the ambient and substrate temperatures and the relative humidity. weber.floor 4680 meets all fire technical requirements as a subfloor for floor covering in passenger/ merchant vessels and offshore installations according to IMO Res. A.687 (16). For special applications not covered in this datasheet, please contact Weber. Also refer to existing national regulations.

weber.floor 4680 is designed to be used in marine applications in light traffic areas and finished with a floor covering such as PVC, vinyl, linoleum, ceramic tiles, carpets etc. It is used as a bonding screed and as an underlayment screed for use on steel, galvanized steel or aluminium decks. weber.floor 4680 is designed for application at thicknesses between 0 and 20 mm.

The substrate must be dry, clean, free from dust, grease and other impurities that might reduce adhesion. Laitence of old coatings and contaminants should be removed mechanically (by shot blasting, scarification or flame gunning). The surface strength of the substrate should exceed 1.0 MPa. Prime the substrate properly. Floor drains etc. must be protected with lids and separated with stop ends.

Steel decks must be primed with weber.floor 4716 primer. Galvanized steel and aluminium decks must be primed with sand sprinkled weber.floor 4710N epoxy primer prior to application of the weber.floor 4716 primer. If another epoxy primer is being used, check for compatibility with weber.floor 4680. For details on the primers see separate datasheets. The function of the primers is to improve adhesion to the substrate, to prevent air bubbles and dewatering of the screed before hardening.

The dry mix material should be kept in a heated area before use. Strongly cooled material conveys a risk that some additives will not be able to dissolve during admixture. Too high temperature will change the fluidity of the compound, eg. lead to premature gelling. The dry mix and work area temperature should be 1030° C.

The material is mixed with 40-45% water, which corresponds to 5.2 to 5.8 litres per 13 kg bag. Excess water will reduce strength, increase shrinkage and encourage segregation. Conversely, reduced water content increases viscosity. A flow ring test should be performed to ensure that the correct amount of water has been used. Also ensure that the mixture is homogenized and free from separation. The temperature of the mix should ideally be 1030° C. The water temperature must not exceed 35°C. The open time is 15-20 minutes after mixing with water. Pour water in a suitable mixing vessel before adding the dry material. Limit the amount of dry material to 34 bags per batch, giving a total volume of 60-80 litres. Use a powerful drill with paddle and mix thoroughly for minimum 2 minutes.

Start in the farther end of the work area and distribute the screed in parallell with an end wall. The application should always finish by an exit/opening. If possible, use two or more mixing vessels to make sure there is always fresh screed available during the application. A wide spatula or steel trowel must be used to assist the selflevelling process. weber.floor 4680 should be applied within 24 hours after the primer has dried to ensure proper adhesion.

Foot traffic 24 hours

Final covering 13 days

High humidity and poor drying conditions prolong the curing time. For moisture sensitive coverings, eg. wooden floors, the manufacturer's instructions should be followed.

Storage time in dry conditions and closed packaging is 6 months. Longer storage times may have an adverse impact on the levelling properties.

weber.floor 4680 must be covered with a floor covering such as PVC, vinyl, linoleum, ceramic tiles, carpets etc. The underlayment must not be used without final floor finish. Cover within 7 days.

Light ventilation in the work area is necessary, but windows and openings must be closed sufficiently to avoid draughts during and after application. The ambient and substrate temperatures must exceed 10°C during application and one week after that. Dehumidifiers should not be used for the first two days after application. Slow drying due to low temperature and/or poor film formation due to high humidity may result in pinholes in the levelling layer.

Weber's Customer Services Department has a team of experienced advisors available to provide on-site advice both at the specification stage and during application. Detailed specifications can be provided for specific projects or more general works. Site visits and on-site demonstrations can be arranged on request.

Technical helpline
Tel: (01525) 722110
Fax: (01525) 718988

Weber products are distributed throughout the UK through selected stockists and distributors. For UK sales enquiries and overseas projects, contact Weber's Sales office.

Sales office
Tel: 08703 330070 (Press 1 for Sales)                                                             Fax: (01525) 718988