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Refractory testpiece preparation. Gunning refractory panels by the pneumatic-nozzle mixing type guns Ingestion-build-264231 This British Standard specifies four1 Scope This International Standard describes the procedure for the preparation of test panels from refractory materials by gunning through pneumatic nozzle mixing type guns at ambient temperatures. NOTE The values obtained from test pieces cut from the panel prepared using this method might not correspond with those obtained from test pieces of the same material prepared at a gunning installation site. This International Standard does not apply to