Gulfstream G200 (IAI 1126 Galaxy)
Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 40; Flight Crew Total 8750; Flight Crew Type 725
Aircraft Equipment Problem Less Severe
Flight Crew Diverted; General Maintenance Action
Aircraft
The first two legs of the trip were uneventful.  While level at FL430; Mach .80 in smooth air; the LH Cockpit Windshield shattered.  It was an explosive shattering; sounding like someone had struck the cockpit with a baseball bat; but fortunately the windshield did not depart the aircraft; or begin leaking air that we could tell.We immediately went on 100 percent oxygen and secured our shoulder straps; and I then asked ATC for a descent to FL280; advising them we were experiencing some windscreen delamination and wanted to reduce our cabin pressure.  We were given a descent and [the First Officer] slowed the aircraft to Mach .70 during the descent; then 270 knots IAS after leveling off.  During the descent I switched the cabin pressurization system to manual and raised the cabin pressure to between 9;000 - 10;000 feet; establishing a cabin differential of approximately 4.5 psi.I called Dispatch on the satphone to advise them of the issue and get divert instructions from Maintenance.  We stayed at FL280; 270 KIAS until given a descent on the arrival into [our divert airport]; and I monitored the electrical page on my side to watch for windshield arcing (we elected to leave the windshield heats on Low); and continued to manually adjust the cabin pressure throughout the descent to maintain a minimal cabin differential.The landing was uneventful; the ship was written up and turned over to [the] maintenance department.
A G200 Captain reported they experienced left cockpit windshield delamination at FL430. The flight diverted to a suitable airport.