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Stemlock Stemliner
Suggestions for Maximum Benefit of Stemliners
If used in coal mines for blast casting we feel that the Stemliner will give best casting results using ANFO, or a low percentage emulsion/ANFO blend. In angled holes, high emulsion blends, being sticky, put undue pressure on the Stemliner. The Stemliner will provide the necessary water resistance if used properly. The use of a low percentage blend may give you some added protection.
For best results either with straight ANFO or blends we recommend adequate priming. Tests run over the years have shown that large high velocity boosters give the best results. Small cast boosters, even 1 pound, can literally get lost in a large diameter hole due to contamination or a poor truck mix.
We recommend that boosters of at least 4" x 10 lb. be used. High velocity water gels or emulsions with a cast booster assembly give the extra boost that insensitive products such as ANFO or blends need to perform properly.
The Stemliners can help, along with the proper product and adequate priming, to reduce the production of noxious gasses (NOx).
Stemliners prevent migration of explosives from the hole due to cracks, water infiltration or other hole imperfections. This can be especially helpful in front row holes that have back break.