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Natural Clay Plastering

MasterFormat 09 25 26 Natural Clay Plastering

This information reflects our best understanding of product composition in 2023.

Natural clay plasters are supplied as powder that is mixed with water on site. They are formulated using natural clays, aggregates, fibers, and may contain additional additives. They are generally specified for interior use and commonly applied...

More about Natural Clay Plastering

Natural clay plasters are supplied as powder that is mixed with water on site. They are formulated using natural clays, aggregates, fibers, and may contain additional additives. They are generally specified for interior use and commonly applied over drywall, although they can be applied over most substrates excluding composite wood. While some products may be applied in one coat, generally a base coat and a finish coat are specified. Products can contain a mixture of clays that impart different properties to the plaster including ball clays, fire clays, and kaolins. Aggregates consist of silt and sand, and often also include crushed marble, calcium carbonate or crushed shells. Straw may also be added to products for additional texture and to prevent crack formation. 

This Common Product describes a natural clay plaster that may be used as either a base coat or a finish coat. While natural clay plasters are mostly composed of minerals, they may contain additional additives. These include fungicides like borax to prevent the growth of mold and mildew, and acrylic polymers to increase durability. Disclosure documents indicate that additional content may be present, but typically withhold the identity of additives as proprietary information.

A number of accessory products are recommended or required when applying natural clay plasters. These include primers, sealers, pigments, and additional additives mixed on site. These products will add additional hazards not considered by this Common Product.

Name % Weight Whole Function GREENSCREEN® Sources
Quartz
14808-60-7
60.82% Aggregate Subscribe to view
Kaolin
1332-58-7
30.64% Binder Subscribe to view
Borax
1303-96-4
3.60% Fungicide, Reduce Shrinkage Subscribe to view
BURNT SIENNA
12000-57-6
2.75% Pigment Subscribe to view
Straw
1.58% Lightweight Aggregate Subscribe to view
Bentonite
1302-78-9
0.61% Viscosity Modifier Subscribe to view
Name % Weight Part % Weight Whole Function GREENSCREEN® Sources
Quartz
14808-60-7
60.82% 60.82% Aggregate Subscribe to view
Kaolin
1332-58-7
30.64% 30.64% Binder Subscribe to view
Borax
1303-96-4
3.60% 3.60% Fungicide, Reduce Shrinkage Subscribe to view
BURNT SIENNA
12000-57-6
2.75% 2.75% Pigment Subscribe to view
Straw
1.58% 1.58% Lightweight Aggregate Subscribe to view
Bentonite
1302-78-9
0.61% 0.61% Viscosity Modifier Subscribe to view

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Known or Potential Residuals

Known or Potential Residuals for Chemical
CASRN NAME GREENSCREEN® TYPE FREQUENCY % Weight Chemical % Weight Product SOURCE
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Other Process Chemicals

Other Process Chemicals for Chemical
CASRN NAME GREENSCREEN® TYPE FREQUENCY % WT CHEM % WT PRODUCT SOURCES
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Habitable Resources (0)

Habitable Resources for Product
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Sources

Sources for Common Product Data
Source Uploaded Document Linked Document
American Clay Original Plasters
American Clay Sec 092526 Spec
American Clay US7485186B2
Claytec Clay Plasters Worksheet
Claytec Mineral Clay Plaster 20
Claytec Undercoat Plaster w Straw PDS
Clayworks Application Guidelines
Clayworks Brochure
Clayworks Clay Plasters EPD
Clayworks Clay Plasters HPD
Clayworks Product Description
Clayworks Sustainability Data
Clime Honed
Clime Honed Specification
Clime Plaster HPD
Embarro Universal PDS
Essential Natural Plasters
Forte Base SDS
Forte Finish SDS
Forte Plasters
Loma SDS
Loma Submittal
Melia 2014
Minke 2011
Montana 2013
NBA Batural Plasters
NBA Natural Plasters
Ranesi 2021
Raw Siennas
Sons Natural Clay Plasters
WO2018056915A1
Zustak 2021