A comparison of the interiors of EFNi, Nickel 200 tubing, and Type 316 stainless tubing shows the quality of the electroformed nickel tubing surface. (All photos are x500 magnification.) The rough interior surface of the mill-drawn Nickel 200 tubing has potential for carryover or cross contamination, and both the Nickel 200 and the stainless steel contain pits, voids, striations, and particles - problems which intensify as the ID decreases.
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Electroformed nickel (EFNI) (x500) 
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| Nickel 200 alloy (x500) 
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Type 316 stainless steel (x500) 
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