Let's say you need a new Honda windshield for your Accord. Your Honda window may have originally been produced by AP Tech, so that's the brand you'd get if you went to the dealer. But if you went to an auto glass shop, you'd get your Honda window from another reputable OEM distributor (Pilkington or PPG, for example) who makes the exact same windshield, to the same specifications. Because your windshield wasn't made by AP Tech, it doesn't qualify as dealer auto glass, but it's just as good. It's so good that if you return a leased vehicle with an OEM distributor windshield, it will still be accepted by the dealer.
All OEM distributors contract with one or more of the various car manufacturers, and that's what qualifies them as Original Equipment Manufacturers. OEM is a good choice for your Honda Accord unless you absolutely have to have the Honda logo on your windshield.
3. Aftermarket Auto Glass
Aftermarket glass is made by companies that do not contract with any car manufacturers, and do not have the legal right to manufacture auto glass to the exact same specifications as OEM distributors due to licensing and copyright laws. Safelite is one of the main aftermarket or "original equipment equivalent (OEE)" auto glass manufacturers. Aftermarket glass is significantly cheaper than OEM or dealer glass. It's usually a different thickness than OEM glass, and most dealers will not accept aftermarket glass when you return a leased vehicle because the glass differs so much from the original design, and does not carry the same guarantees as OEM auto glass.
by Sara Bruse, Glass.net Customer Service