Polymer Modified Mortars

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ANSI A118.11 Multi-Purpose Thinset-Polymer Modified Mortars

PROFLEX® PRO-STICK 42R (ANSI 118.11) is a rapid set thin set mortar is formulated to be a fast setting mortar with superior performance and workability characteristics. PRO-STICK 42R When mixed, has an initial setting time of 1 hour. Specially developed for the professional tile installer. For commercial and residential use.


  • ANSI A118.4, ANSI 118.11 compliant
  • 1 hour initial set, 2-4 hours foot traffic
  • High strength for a variety of bonding applications


For installation of: Ceramic tile, Pavers, Quarry tile, Porcelain tile, Clay bodied tile, High bottom lugged tile, Marble, Granite, Mosaic, large format tiles, Vertical tile installations up to 5 lbs per sq. ft For installation over: Tile backerboard, Plumb and true masonry, Properly cured and finished concrete, Gypsum plaster, gypsum block or gypsum board (dry areas – walls only,) Cured portland cement mortar, exterior grade plywood, plastic laminates, masonry surfaces..

Shear Strength  7 days (psi) 28 days (psi)
Quarry Tile 300-350 450-500
Mosaic Tile 300-350 350-400
Glazed Wall Tile  400-450 450-500

Quarry Tile to Plywood

175-200 200-250
Compressive Strength 4000-4500 6000-6500
Adjustability 15-20 minutes
Open Time 30 minutes

Initial Set

Final Set

60 minutes

90 minutes

Recommended Trowel Sizes

1/2” x 1/2” x 1/2” square notch trowel 20-25 sq. ft., 1/4” x 3/8” x 1/4” square notch trowel 35-40 sq. ft.

Suitable Surfaces

Backer Boards, Plumb and True Masonry, Cured and Finished Concrete, Gypsum Wallboard (dry areas only), Cured Portland Cement, Exterior Grade Plywood, Plastic Laminate, Masonry Surfaces, Proflex Membranes and Underlayments (see warranties)


25 lb. bag, 96 bags per pallet