50 lb. or 63 lb. recyclable bags.


Store indoors elevated off the floor. Plaster should acclimate 72 hours to environment.

VOC’s (Volatile Organic Compounds)


Mold Resistance

0% mold growth, per test results from procedure ASTM D3273-00. To learn learn more about American Clay Earth Plasters’ humidity bufferring qualities, watch our short video demonstration comparing clay plaster against paint in a highly humid environment. You can also download a handout explaining the demonstration.

Watch Humidity Demonstration Video Now! http://www.youtube.com/watch?v=eqnYaHAWPbk&feature=player_embedded

Flame Spread

ASTM E84, rating of 5; UBC Class I. NFPA Class A. Smoke development 0.


ASTM 423-07; SAA: 0.09; NRC: 0.10. ASTM 90-04; STC:31.


ASTM E-96; 45.76 perms; 16.91 grains/hr-ft2.

Recycled Content

72% post industrial by weight.

Carbon Footprint

0.026 pounds of CO2 per pounds of product. (In comparison, Paint is 0.729 pounds of CO2 per pounds of product.)

Source: Inventory of Carbon & Energy (ICE); Published by Geoff Hammond & Craig Jones, 2008


Complete application instructions can be downloaded from our website, under Product Application.

Clean Up

Water with a damp sponge or rag.

Drying Time

Climate will affect product drying time. 2-4 hours in dry climates and 6-10 hours per coat in humid climates. Dehumidifiers and increased air circulation using fans will decrease dry time.


American Clay plasters can contribute to the U.S. Green Building Councils (USGBC) credits, under the LEED-NC rating system, version 2.2. Up to 10 LEED credits may be contributed. To learn more, see LEED Credits under Technical Documents.

Easy To Use & Zero Waste

Take your time and work with confidence, our plasters have a long working time and can be reworked even after they dry. There is no waste; excess plaster can be dried and re-hydrated for repairs.

Our Clay Features

    • 100% natural
    • VOC-Free (Volatile Organic Compound)
    • Non-toxic
    • Absorbs odors
    • Mold resistant
    • Moisture controlling
    • Temperature and humidity buffering
    • Durable
    • Resists fading due to the natural mineral pigments
    • Covers a variety of substrates

Benefits Of Using Clay Plaster

    • Easy to repair
    • Easy clean up
    • Eliminates the need to repaint year after year
    • Resists dirt and grime
    • Ships dry
    • Lowest carbon footprint per pound of any interior wall finish
    • Creates a calming environment