Mill mixed perlite aggregate. Lightest weight gypsum plaster. Ideal for areas where it is not desirable to mix aggregate with plaster on the job. Apply on gypsum or metal lath, clay tile, concrete or cinder blocks. Excellent for areas requiring highly insulated plaster. Provides "K" factor of 1.74. Use where high thermal conductivity plaster applications are needed. Meets ASC28, Fed Spec S S-P-00402B, Type 1.