Preforms of two-dimensional Tyranno fibre (SIC base) of 7 x 20 x 1.3 mm(3) were chemically vapour infiltrated with SIC at 850-1050 degrees C from a gas mixture of CH3SiCl3 (6%)-H-2 using pressure pulses between below 0.3 kPa and 0.1 MPa. Above 900 degrees C, films grew on the macrosurface dominantly. At 850 degrees C, residual porosity decreased to about 10% after 10(5) pulses, and three point flexural strength reached about 200 MPa. X-ray diffractograms (XRDs) on the surface showed the deposits to be beta-SiC only.