DELIVERY AND STORAGE

A. Delivery:

All material is to be delivered in original unopened packages bearing the name of the manufacturer, the brand and proper Underwriters’ Laboratories, Inc. label for fire resistance classification.

B. Storage:

The material shall be kept dry until ready for use. Packages of material shall be kept off the ground, under cover and away from sweating walls and other damp surfaces. All bags which have become wet before use shall be discarded. Stock of material is to be rotated and used before its expiration date.

MIXING AND PUMPING STATION

A. Placement:

The entire working and storage area should be covered from rain and construction water with the material stored to prevent contact with water on the floor. All wet bags must be discarded.

B. Equipment:

Type HC^TM Hard Clad pumps best with progressive cavity type pumps (typically a 2L4 or 2L6) which have given good field performance.

Plaster mixers with rubber wiper blades that scrape the sides clean are recommended for Type HC^TM Hard Clad. Mixer speed should be adjustable and the clutch should permit frequent start/stop operations.

C. Set Up:

The pump should be as close as possible to the work. This permits hose length to be minimized. Place the mixer next to and above the pump hopper. It should be high enough to permit full rotation to the complete dump position. Wash water should be drained away from the pump area.

MIXING PROCEDURE

A. Sequence of Operations

1. Check to make sure mixer bowl and blades are clean.

2. Adjust the mixer speed to 30-40 rpm.

3. Add water to the mixer first. Use approximately 2 ½ U.S. gallons per 80-pound bag of Type HC^TM Hard Clad. This is the recommended starting point of water addition. Do not over water because too much water will reduce the quality of the finished product. Water is to be clean, fresh, suitable for domestic consumption and free from such amounts of mineral or organic substances that would affect the set of the Portland cement.

4. Add bags of Type HC^TM Hard Clad with the mixer blades turning.

5. Mix for approximately 60 seconds. Adjust the water as required to obtain the desired mix consistency for spraying or trowelling.

6. Let the mixer blades turn for approximately 10 seconds to re-blend before dumping. Dump entire batch. The mixer must empty completely when dumped to avoid leaving any old mix to be reworked in succeeding batches.

B. Precautions

1. Occasionally scrape the inside walls of the pump hopper.

2. Wait until enough material has been pumped out of the hopper to allow sufficient room for the addition of the entire new batch from the mixer.

3. If the pump hopper will not take an entire batch, stop the mixer until the remaining material can be discharged. Restart the mixer for 10 seconds before dumping the remaining material.

4. Mixing by hand is specifically not recommended for Type HC^TM Hard Clad.

5. Type HC^TM Hard Clad should not be reworked. Normal working time is 30 minutes at 75⁰F (24⁰C.) Clean mixer to prevent contamination of fresh material with partially set material.

6. The immediate mixing area is likely to be dusty so mixing personnel should wear approved dust masks and work in a ventilated area.

PUMP START-UP

1. About 2 gallons of water should be added to the mixer with the blades turning, and then dumped into the pump hopper.

2. The first Type HC^TM Hard Clad mix should be prepared and the pump started. The mix is to be dumped into the pump hopper when the last of the water enters the pump intake. DO NOT LET THE PUMP RUN DRY.

3. Pumping should continue until the water and a small amount of Hard Clad has passed out of the end of the hose.

4. The nozzle is to be attached to the whip hose with the air stem pulled back and the air reduced at the nozzle. This leaves an unrestricted path for material to flow through the orifice.

5. After material flow has started, the air pressure is to be increased and the air stem adjusted to give an acceptable spray pattern.

6. If a blockage occurs at the orifice, the pump should be stopped, the rubber cap removed and the orifice cleaned.

APPLICATION

1. Minimum air and substrate temperatures of 40⁰F (4.5⁰C) shall be maintained for 24 hours before and after application of fireproofing.

2. Type HC^TM Hard Clad must be applied to a fireproofing base material which has set to form a sound substrate for the Hard Clad.

3. Type HC^TM Hard Clad MUST NOT BE APPLIED OVER A DRY SUBSTRATE. If previously applied base has dried, care should be taken to thoroughly re-wet the surface of the material immediately prior to application of the Hard Clad.

4. The texture of the Type HC^TM can be varied by the air pressure at the nozzle. The recommended pressure is 15 psi, although a slightly higher pressure will result in a finer texture. Small orifices will also provide a lightly textured surface.

5. Type HC^TM Hard Clad can be finish trowelled or dry brushed immediately after application to a smooth finish. Avoid overworking the trowelled surface.

6. Do not use additional water to finish the Hard Clad.

7. Type HC^TM Hard Clad is to be applied in a nominal 1/8" or 1/4" thickness.

8. Type HC^TM Hard Clad, once mixed, can be trowelled by hand to the base material. Proper application should follow the general guidelines for cement plaster finish coats.

MASKING AND CLEAN-UP

1. Masking is required to protect sensitive equipment, aluminum surfaces and other surfaces not scheduled to be coated which can not easily be cleaned.

2. Over-sprays of Hard Clad may be cleaned up with water before the material sets. Type HC^TM Hard Clad adheres tenaciously to most surfaces when set and cured. Therefore, Hard Clad over-spray must be removed before it sets.

PUMP SHUT DOWN PROCEDURES

THOROUGH WASHING AND FLUSHING IS NECESSARY TO PREVENT MATERIAL FROM SETTING AND ACCUMULATING IN THE HOSES AND FITTINGS.

1. After the last mix of the day has cleared the hopper, the pumping speed should be reduced and large amounts of water pumped through the system. A sponge can also be pumped through the hose by removing the hose at the pump manifold and placing the sponge directly into the hose.

2. At least two minutes of clear water should pass through the nozzle before the pump is shut off.

3. After the pump is shut off, all fittings should be disassembled and cleaned.

SAFETY

A. Type HC^TM Fireproofing is slippery when wet. The general contractor and applicator shall be responsible for posting appropriate cautionary "SLIPPERY WHEN WET" signs. Signs should be posted in all areas in contact with wet fireproofing material. Anti-slip surfaces should be used on working surfaces such as scaffolding.

B. Read and post the Material Safety Data Sheet.

PAINTING OF TYPE HC^TM Hard Clad

Type HC^TM Hard Clad may be painted to achieve a specific color. Paint to be suitable for application to Portland cement surfaces and applied in accordance with manufacturers written instructions.

End of section 2/2005

Southwest Fireproofing Products Company, Albuquerque, NM 87107 Phone: (505) 345-1633

©2004 Southwest Fireproofing Products Co.

Southwest Fireproofing, Type 5GP, Type 5EF, Type 5MD, Type 7GP, Type 7HD, Type 1XR, Type DK, Type HC and Type 7TB

are trademarks of Southwest Fireproofing Products Co.