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GAMMA

Product description

Hand–applied Gypsum Plaster GAMMA is designed for manual indoor execution of single coat gypsum plasters in residential buildings, public access buildings, hospitals, hotels, schools, etc.
Can be applied onto walls and ceilings, in rooms of standard air humidity including the kitchens and bathrooms.

Main properties

  • based on synthetic gypsum
  • working time: 240 ± 15 minutes
  • flexural strength: ≥ 1.5 N/mm²
  • compressive strength: ≥ 3.0 N/mm²

Main parameters

  • Yield: 100 kg of gypsum = approx. 120 l of mortar
  • Consumption: approx. 0.85 kg / 1 m²/ 1 mm
  • Minimum coat thickness: 10 mm (minimum 8 mm)
  • Maximum coat thickness on a wall: 30 mm
  • Maximum coat thickness on a ceiling: 15 mm

USE

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Hand–applied Gypsum Plaster GAMMA is designed for manual indoor execution of single coat gypsum plasters in residential buildings, public access buildings, hospitals, hotels, schools, etc. Can be applied onto walls and ceilings, in rooms of standard air humidity including the kitchens and bathrooms. Perfect for renovations, can be used for the reveals detailing at window, door and sills fixing. Can be used on substrates made of ceramic elements, sand–lime bricks, normal and cellular concrete.

PROPERTIES

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Hand–applied Gypsum Plaster GAMMA is a modern factory–made mortar based on synthetic gypsum, mineral fillers and chemical additives. After mixing with water, the mortar is efficient, plastic, easy in use. It is characterised with good adhesion with the substrate. Its working time is optimum for the technology of application of manual plasters. The plaster surface is even, smooth, hard and provides a perfect substrate for painting, wallpapering and tiling. The use of a gypsum plaster ensures favourable room microclimate, with beneficial influence on human health and well-being. The plaster coat is additionally characterised with favourable thermal and acoustic insulation parameters as well as full fire resistance.

SUBSTRATE PREPARATION

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The substrate should be stable, dry, free of bloom and cleaned of impurities which might reduce the gypsum adhesion, particularly of dust, dirt, form oils, greases, remains of paint coatings and anti-adhesion agents. The substrate should be properly aged and its humidity must not exceed 3%. Very absorbent and porous substrates (cellular concrete, sand-lime and ceramic bricks) should be primed with one of the priming agents EURO-GRUNT. In case of smooth substrates or those of low absorptiveness (concrete), use the priming agent INTER-GRUNT. Any steel elements, which might contact the plaster directly, should be protected against corrosion. Frozen substrates must not be plastered.

MORTAR PREPARATION

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Pour the dry mix into a container with clean water (ratio: approx. 12 l of water for 20 kg of gypsum), leave for a few minutes, then mix manually or mechanically until homogenous and free of lumps. The mass keeps the working parameters for approx. 30 minutes. Unused mortar, when its setting starts, must not be re-mixed with water and should be removed as it shortens the setting time of the next mix.

APPLICATION

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Large walls should be divided into technological fields with metal battens with 1 m spacing. Fix metal mesh corner beads onto the room corners and the window and door reveal edges. The battens and beads should be fixed with a plastering mortar and vertically levelled until the mortar keeps plastic.  Proper fixing of these elements facilitates the plaster application and thickness monitoring. It is recommended to apply a single plaster coat with the use of a trowel or a float. Recommended minimum thickness on walls and ceilings – 8 mm, maximum thickness on walls – 30 mm, maximum thickness on ceilings – 15 mm. Commence the application on the ceiling in direction from the window inwards. On the walls the plaster is applied starting from the wall bottom moving upwards. Once applied, the mortar should be initially evened with a “H-type” darby. Any cavities should be regularly filled with additional mortar with the use of a stainless plastering trowel. When the mortar partially sets, the plaster plane should be formed with the use of a feather edge or a long float. Appropriately set plaster should be misted and floated with a sponge float in order to “extract” bleed water onto the surface. Once it becomes matt, it should be uniformly spread upon the whole surface with a long float. Caution! Plasters planned to be covered with ceramic tiling should be floated “rough”. In other cases, the surface smoothing gives smooth surface with fine pores. During the first 24 hours after application, the gypsum plaster should not be exposed to draught or direct sunlight. Next, it is recommended to ventilate the rooms thoroughly, which greatly facilitates the plaster drying. Detailed information on the substrate preparation and plasters application can be provided by the manufacturer. The drying time depends on the plaster thickness, temperature and humidity of a room. It can be assumed that the plaster of thickness of 15 mm, in a properly ventilated room and temperature above 15 °C,  dries approx. 14 days. The plaster surface must dry properly before any subsequent cladding or painting works.

CONSUMPTION

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The average consumption is ca. 0.85 kg per 1 m² for coat thickness of 1 mm.

PACKAGES

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Paper bags 20 kg.
Pallet: 1,000 kg.

STORAGE AND TRANSPORT

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Shelf life is 6 months from the production date given on the bag. Transport and store the product in tightly closed bags, on pallets, in dry conditions. Protect against humidity. Incoherence with recommendations listed above may impact the product working parameters.

TECHNICAL DATA

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Mixing ratio:
ca. 12.0 l of water for 20 kg of dry mix
Yield:
100 kg of gypsum = ca. 120 l of mortar
Pot life:
240 ± 15 minutes (depending on storage period and conditions, room temperature and humidity)
Beginning of setting:
> 50 minutes
Conditions during plastering:
substrate and ambient temperature:
+5 °C and +25 °C, room humidity: up to 70%
Bonding to the substrate:
≥ 0.3 N/mm²
Flexural strength:
≥ 1.5 N/mm²
Compressive strength:
≥ 3.0 N/mm²
Bulk density:
approx. 800 kg/m³
Specific gravity:
approx. 950 kg/m³
Minimum coat thickness:
10 mm (minimum 8 mm)
Maximum coat thickness on a wall:
30 mm
Maximum coat thickness on a ceiling:
15 mm

Standard marking
Gypsum plaster for plastering walls and ceilings
EN 13279-1- B1/20/2
Use
Indoors
Reaction to fire
Class A1
Airborne sound insulation
NPD
Thermal resistance
NPD

Conforms to the requirements of PN-EN 13279-1:2009 standard.
Declaration of Performance no. EC 25/CPR.
The product has been given the hygiene certificate no. HK/B/0124/01/2015 issued by the Polish National Institute of Hygiene and the radiation hygiene certificate no. HR/B/108/2011.
 
NOTE
Irritant. Irritating to eyes. Keep out of the reach of children. Do not breathe dust. Avoid contact with skin and eyes. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Do not empty into drains. Wear suitable protective clothing and eye/face protection. If swallowed, seek medical advice immediately and show this container or label.
 
The above information constitutes basic guidelines for the application of the product and does not release the user from the obligation of carrying out works according to building principles and OHS regulations. At the time of publication of this product data sheet all previous ones become void.