Are there third part manufacturers safe to use for charging
What third party manufacturers are safe for charging
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Good quality Power Adapters from reputable manufacturers should all be safe to use with your iPad - subject to a few caveats.
That said, it is false economy to choose a Power Adapter because it is cheap. Your iPad is relatively expensive and easily damaged; good quality Power Adapters, such as Apple’s own, are both reliable and contain protective circuitry that will help to protect the iPad from damage if a fault were to occur.
Check that your third-party Power Adapter supports USB PD (Power Delivery). Apple devices do not support other manufacturer-specific fast charging standards - such as QC (Quick Charge).
Apple’s current range of Power Adapter’s, including those intended for Mac computers, all support USB PD. PD is an active protocol; the source (Power Adapter) and sink/load (in this case, your iPad Pro) “negotiate” and agree a common Power Profile that will determine the charging voltage and current that will be applied.
For non-PD compliant devices - or compliant devices that fail to negotiate a mutually supported Power Profile - the Power Adapter will only supply the standard USB 5V at a reduced current. This mechanism ensures that the higher charging voltages not supported by non-PD devices are not damaged by an over-voltage condition.
Most models of iPad require a Power Adapter rated at 12W or greater to reliably charge. 5W Power Adapters intended for older models of iPhone are inadequate to charge an iPad; if the iPad charges at all, charging will be very slow. Most iPad models will charge at the maximum supported rate when charged from a 20W USB-C Power Adapter thar supports USB PD.
Be aware that many computer USB ports cannot source sufficient power to charge an iPad. Unless explicitly designed for charging connected devices, computer USB ports are typically limited to 0.5-1A @5V (i.e., 2.5-5.0W).
Of available third-party Power Adapters, Anker and Mophie are well known and well regarded - but you must always check the specifications for suitability.