PT 300 is a factory mixed adhesive render following European standard DIN 18550 and DIN 18555 and is suitable for use as a bond (key) coat on polystyrene. PT 300 Adhesive Render can be universally applied to outdoor areas and is designed specifically for use as a key or bonding plaster on polystyrene.PT 300 can also be used to fix polystyrene boards to all common, good bearing wall backgrounds or as a basecoat on pre-cast or painted surfaces.

Preparation
The substrate must be of a sound nature, free from dust and loose particles, form release oils and other contaminants which could affect adhesion and bonding strengths of subsequent coatings.
Substrates with voids, defects and uneven surfaces do not require special preparation.

Application
PT 300 is suitable for commercial plastering machines or manual application (drill mixed only).
On polystyrene Pt 300 can be used as a basecoat to a minimum of 3 to 4mm thickness, thereby providing a bonding surface for further coats of plaster.

On polystyrene, the use of fibreglass mesh embedded wet-in-wet either in the first 5mm of plaster (PT 300) or in a specific meshcoat (see PT 320) is essential. The entire area to be plastered must be meshed in this way. When trowelling mesh into PT 300 ensure that the breglass mesh is trowelled in such a way that it remains towards the exterior surface of the plaster and that it is overlapped at least 100mm where it is joined. Putztechnik  recommends the use of Fibreglass Mesh fibreglass reinforcing mesh.

Coverage
Depending on the substrate a 25kg bag of PT 300 yields approximately 3 square metres at 3-4mm thickness.

Important
Do not under any circumstances add foreign substances other than clean water to premixed mineral plasters.
Do not add further water to PT 300/water mixture later than two hours after original mixing.
Allow 1 day/mm drying time prior to applying further coats of plaster. If necessary, contact Putz-technik for further information on drying times.

Technical
PT 300 is manufactured using selected aggregates, cement and mineral additives. Sand particle size range is 0 to 1.0mm.
PT 300 has a high water vapour permeability (breathing activity).
Where a resistance rating is required please contact Putz-technik Products.

Storage
PT 300 is packaged in 25kg paper bags, with 40 bags (1 tonne) per pallet.
PT 300 can be stored in a dry place for up to 6 months.Quality Control
PT 300 is quality controlled at point of manufacture and tested by independent laboratories.Service
At the forefront of plastering technology, Putz-technik  offers its assistance and experience in the selection and use of our products and machines.