PT 400, PT 451 and PT 402 are factory mixed gypsum-lime based dry plasters following European standard DIN 18550 and DIN 18555.
PT 400 Adhesive Render can be applied to all internal walls and ceilings and to all masonry substrates including fibre cement sheet, as well as Gib Board.
PT 451 is specially formulated for use as a basecoat on polystyrene.
Where a high level trowel finish is required PT 402 can be applied as a finishing coat over PT 400 or directly over Gib Board.
All three gypsum plasters have excellent adhesion and compression/flexural strength ratios.
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.
High absorbing substrates (e.g. aerated concrete) should be sealed with SK15 prior to the application of PT 400 to control the absorption of water from the plaster into the substrate.
When rendering Gib Board with PT 400 or PT 402, all joins must be taped and stopped prior to plastering.
In bathrooms or where waterproofing of internal walls may be required, contact Putz-technik products for application details.

Application
On polystyrene, PT 451 is used as a basecoat from 5mm to 8mm thick, thereby providing a bonding surface for further coats of gypsum plaster (i.e. PT 400).
PT 400 can be applied as a single coat directly to masonry and Gib board substrates without the necessity of a basecoat. PT 400 can be applied from 3mm up to 20mm thick. PT 402 can be applied to a minimum thickness of 2mm.

PT 400 and PT 451 are suitable for commercial plastering machines or manual application (drill mixed only). PT 402 is suitable for drill mixing only.
When rendering polystyrene, the use of fibreglass mesh fully embedded wet-in-wet in the first 5—8mm of plaster (PT 451) is essential over the entire area being plastered. When trowelling mesh into PT 451 in this way ensure that the breglass mesh is trowelled so that it remains towards the exterior surface of the plaster and that it is overlapped at least 100mm where it is joined. Putz-technik products recommends the use of Fibreglass Mesh breglass reinforcing mesh..
When rendering cementitious substrates or Gib Board (with PT 400), fibreglass mesh should be used in areas of known or potential stress such as door and window lintels, dissimilar substrates, etc.
With a 3—4 hour setting time, all three whitesets can be easily worked to any desired effect.

Colour
PT 400 and PT 402 can be ordered pre-coloured with oxide.

Coverage
Depending on the substrate a 25.00kg bag of PT 400, PT 402 or PT 451 yields approximately 1.5—6.0 square metres.

Important
Do not under any circumstances add foreign substances other than clean water to premixed mineral plasters.
Paints and sealers should not be applied to mineral plasters until sufficiently hardened and dried.
Once mixed, do not add further water to whiteset/water mixture .

Technical
PT 400, PT 402 and PT 451 are manufactured using selected aggregates, gypsum, lime and mineral additives. Sand particle size range is 0—1.0mm.
All three whitesets have high water vapour permeability (breathing activity).
Where a re resistance rating is required please contact Putz-technik products.
Compressive Strength N/mm² 2.5—3.5
following European Standard DIN 18555
Flexural strength N/mm² 1—1.5
Specific gravity 1.20