Casting Procedures
Preparation
Prior to packing the mold, a non-staining mold release should be applied to all surfaces, making sure to treat undercut areas well.
Mixing
The mixing ratio is approximately 9 parts powder to 1 part water by volume, depending on temperature and humidity. More water may be required as ambient temperature rises. The mixing may be done by hand, stirring until the mortar is thoroughly mixed. The mortar should be the consistency of damp sand. M150 may also be mixed using a slow speed drill (400 - 600 rpm) equipped with a Jiffler-type mixing paddle. For best results, add the powder to the water slowly. The working time will vary, depending upon wind, temperature, and humidity.
Casting
Clean the mold of all foreign material which could cause imperfections. Coat the mold with a non-staining release agent. Scoop approximately 1/3 of the mixed mortar into the mold and tamp it firmly. Press the initial application into place by hand, making certain to completely fill intricate detailing and undercut areas. As the build-up of material proceeds, tamp mortar repeatedly to consolidate. Compaction may be performed using wood tamp and a mallet. Proper compaction is essential for sharp edges. Repeat the process until the mold is slightly overfilled.
Once filled and firmly compacted, screed excess material. This should produce a flush surface with the top of the mold. Cover casting with plastic sheeting for approximately 24 hours.
Curing
After the initial 12-24 hours has elapsed, uncover the mold and pour clean potable water into the cast until the point of rejection. Recover mold with the plastic. Remove cast from the mold after an additional 24 hours have passed.
Safety Requirements
It is recommended that safety goggles, gloves, and a dust mask equipped with P-2 filters (or equivalent) be worn for protection while mixing.
Packaging and Coverage
A 5 gallon plastic pail contains approximately 44 lb. of material. This will produce 0.5 cubic feet of casting mortar.
Storage And Shelf Life
Store material in a dry area away from direct sunlight. Ambient storage conditions should be in the range of 40° F to 90° F with low to average humidity. Average shelf life is 6 months in original, unopened packaging.
Technical Data
Jahn M150 - Casting Mortar
| LIQUID/ PLASTIC PHASE | |
| Rate of water/dry material | 1.4 fl. oz./lb. |
| Volume per pound mixed mortar | 9.0 fl. oz./lb. |
| HARDENED PHASE | |
| Compressive strength | 12300 to 14500 psi |
| Tensile bending strength | 900 to 1500 psi |
| Tensile strength | 700 to 1100 psi |
| Absorption (%) | 4.0 to 6.0 |
| Specific gravity | 2.1 |
Data Sheet Downloads
Warning
Not for internal consumption. Keep out of reach of children and animals. Consult Material Safety Data Sheet (MSDS) for specific information.