Choosing a mirror, what the best material ? Si, Mo, HQ Znse, CoCrPt ?

Lasers
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Choosing a mirror, what the best material ?

Si, Mo, HQ Znse, CoCrPt ?

http://www.ebay.co.uk/itm/HQ-ZnSe-GaAs-Focus-Focal-Lens-Si-Mo-K9-Reflective-Mirrors-CO2-Laser-Engraving-/181596677092?var=&hash=item2a480163e4:m:meMO7Y-AHxPJ3mdppCpT1mw

or

http://www.ebay.co.uk/itm/Dia-20mm-Platinum-CoCrPt-Reflection-Reflective-Mirror-for-CO2-Laser-Engraver-/141588635610?var=&hash=item20f7571fda:m:m_cAGpfqEn4-xe_hAJQ6FyA

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How do I become a member?

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+Peter van der Walt thank you

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@Scott_Howard Welcome here, by just joining the community, and sharing your experiences

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+Peter van der Walt Why?

What makes Mo better than the other mirror types for our long wavelength CO2 lasers?

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+Peter van der Walt thank you for your precisions.
I went for the CoCrPt because of delivery time.
(3 weeks was too long), it’s quick and cheap so I could afford to have a go.

precision diameter 20mm thickness 1.75 (original is 3, but it’s provided with spacer)
to unfit just unscrew from front.

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+Peter van der Walt Not doubting your experience or credentials, nor sure why you’d infer that. Just hoping you’d expand your one word answer to learn more about why it’s a better material; thanks for the explanation.