Patching refractories

Patching refractories, tempered with water and/or with a binder added for softer plasticity, which permits patching in place. 

Topical patches or oral nitrates are acceptable alternatives for patients without ongoing or refractory symptoms... 

The Pfizer group in the United Kingdom has been actively involved in the search for new Class III antiarrhythmic agents. It has patented a variety of structural types that make extensive use of the methylsulphonylamino moiety. These include indanes [173,174], pyridines [175,176], piperazines [177-179], benzazepines [180], bisarylalkylamines [181] and diazabicyclic compounds [182], From this extensive work, two compounds, UK-66914 (65) and UK-68798 (66), have entered clinical trials. Compound (65) increases the effective refractory period (ERP) of ferret papillary muscle by 25% at a concentration of 0.5 //M [183]. Whole-cell patch-clamp studies... 

Topical and oral bexarotene are approved for early-stage (patch and plaque) cutaneous T-cell lymphoma that is refractory to at least one other therapy. Oral bexarotene is also approved for refractory cases of advanced disease however, the best response has been noted in early disease. 

Use Spark plugs, chemical lab ware, pyrometer tubes, special porcelain shapes, furnace patch and refractories. 

Trowelable refractories are a kind of castable refractory mortar with a consistency that makes it easy to trowel into place—very useful for patching and for shaping complex surfaces. 

Cut-back. The careful removal of damaged or worn refractory surrounding a lining failure site, until sound refractory capable of being patched is reached. 

Flaking. The detachment of thin patches of refractory from the silica lining of a gas retort. It is probable that flaking is initiated during the working period of the retort and that the removal of scurf (q.v.) may be a contributory, but not the principal, factor. 

Hot Patching. The repair of the refractory lining of a furnace while it is still hot this is most commonly done by spraying a refractory slurry through a cement gun. See also air-borne SEALING and SPRAY WELDING. 

Patch. A repair to a brick lining, especially to one in which the refractories are bricked in rings, and no whole ring is replaced. 

Torkret Process. German process for spraying refractory patching material on the walls of steel-furnace ladles. Tomebohm s Minerals. See alite belite celite and felite. 

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