Welch pumps are made in china now bc they have so many shard holders who don’t care about thier old production facilities. I’ve been servicing these pumps and seen the insides prior to repairs and seen the liners peel.
The welch 2522b vac pumps are awesome!!! We have 8 at the lab, and I own 3. 1 can handle 3x 2000ml/600ml buchner funnel setups easily. A 5l rotovap easily also. I have hundreds of hours, and no rebuilds. Still pulls -26hg. I even use 1 just for vac sealing Mason jars.
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Like I said, I’m working on one right now that’s been beat to hell and there’s no sign of any PTFE components being PTFE-lined. Just solid PTFE.
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