Product description

Basic use
CEMEX’s Victor Plastic Cement is specially formulated and manufactured to produce a cementitious binder for Portland Cement Plaster.

Composition and materials
CEMEX’s Victor Plastic Cement consists of a mixture of Portland Cement and plasticizing materials (such as limestone, hydrated or hydraulic lime) together with other materials introduced to enhance one or more properties. These components are proportioned at the cement plant under controlled conditions to assure product consistency.

Types
CEMEX’s Victor Plastic Cement is produced to meet the requirements of UBC Standards 25-1 for the production of Portland Cement-Based Plaster as designated in ASTM Standard Specification C-926 (Application of Portland Cement-Based Plaster).

Limitations
CEMEX’s Victor Plastic Cement is designed to be mixed with sand and water. The addition of hydrated lime or any other materials to a plastic cement plaster at the job site is not required or recommended.

Technical data

Related Standards:

ASTM C-91 (Standard Specification for Masonry Cements)

ASTM C-926 (Standard Specification for Application of Portland Cement-Based Plaster)

ASTM C-897 (Specification for Aggregate for job mixed Portland Cement-Based Plasters)

ASTM C-1328 (Standard Specification for Plastic (Stucco) Cement)

Water
All water should be clean and free from organic material and deleterious amounts of dissolved acids, alkalies and salts.

Physical properties
CEMEX’s Victor Plastic Cement provides consistent workability, strength, durability, appearance and meets UBC and ASTM physical requirements for plastic cements. (See Table 1).

Durability
Properties of plastic cement plaster related to its durability include:

• Drying shrinkage characteristics. Results of laboratory test shown in Figure I indicate that the drying shrinkage of plastic cement plaster is about half that of Portland Cement-Lime Plaster (See Figure 1).

• Resistance to sulfate attack. Plastic Cement Plaster also demonstrates significantly greater sulfate resistance than Portland Cement-Lime Plaster (See Figure II).

• Water permeance. Laboratory research has confirmed the excellent performance of plastic cement plaster in water permeance tests (See Figure III).

Installation

Preparation
CEMEX’s Victor Plastic Cement proportioned with sand meeting ASTM C-897 will produce plaster meeting the requirements of ASTM C-926. Under the requirements of ASTM C-926 (Table 3, Base Coat Proportions), cement-to-sand proportions for job mixed plaster are to be in the range of 1:2½ to 1:4 for the Scratch coat and 1:3 to 1:5 for the Brown coat.

In accordance with ASTM C 926 - All plasters shall be prepared in a mechanical mixer, using sufficient water to produce a workable consistency and uniform color.

Hot weather and retempering
Plaster exposed to hot winds and full sun will tend to lose workability due to the evaporation of water. Common sense precautions such as shading the mixer, covering wheelbarrows and tubs, and balancing plaster production to meet demand should be taken to protect the plaster. If it is necessary to restore workability, plaster may be retempered by adding water and remixing. No plaster mix should be used or retempered beyond one hour after the initial mixing.

Cold weather precautions
Mortar should be maintained at a minimum temperature of 40° F as prescribed by standard cold weather masonry specifications. Cold weather admixtures should be approved by the architect.

Sand should be protected and/or heated to prevent ice from forming. The fresh work should be protected at a minimum temperature of 40°F (6°C) for a least three days to provide proper curing for the plaster.

Availability

CEMEX’s Plastic Cement, available in the western United States under the brand name Victor Plastic® can be ordered by contacting the California sales office. A complete listing of CEMEX sales offices are:

Maintenance
Avoid use of harsh chemical cleaners or strong acid solutions in cleaning plaster.

Technical services
CEMEX personnel are available to provide technical assistance by contacting any of the offices listed previously.

Filing systems

• Electronic SPEC-DATA*
• SPEC-DATA*

Warranty
CEMEX warrants that the products identified are in accordance with the appropriate current ASTM and Federal Specifications. No one is authorized to make any modifications or addition to this warranty. CEMEX makes no warranty or representation, either expressed or implied with respect to this product and disclaims any implied warranty of merchantability or fitness for a particular purpose.

As CEMEX has no control over the other ingredients mixed with this product or the final application, CEMEX does not and cannot warrant the finished work.

In no event shall CEMEX be liable for direct, indirect, special, incidental or consequential damages arising out of the use of this product, even if advised of the possibility of such damages. In no case shall CEMEX’s liability exceed the purchase price of this product.

U.S. Operations Headquarters
920 Memorial City Way, Suite 100
Houston, TX 77024
(713) 650-6200