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Old 01-03-2013, 05:16 AM   #11
fiberpro

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I found a new pump, my question is : Does it make a difference between pump which suck up to 5Pa and those which suck to 10Pa ?
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Old 03-13-2013, 09:09 AM   #12
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waiting for advised also
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Old 03-13-2013, 02:54 PM   #13
dnmeid

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Such low absolute pressures are generally not needed for average composite work. 5Pa (5∙10⁻⁵bar) or 10Pa (10∙10⁻⁵bar) doesn't matter. Every vacuum below 100Pa (1mbar) absolute pressure will be fine even for infusion. But often the pump is not reaching the advertised "theoretical" ultimate vacuum in real life and the pressures are only valid with open gas ballast.

More interesting is the pumping speed, i.e. how many litres per minute or cubic meter per hour the pump is able to draw. The larger your part, the larger this should be. Convenient work starts with >10m/h (167l/min) and you can double this for larger parts.
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Old 03-18-2013, 05:40 PM   #14
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the largest is car hood around 1.5m2.
Can I use the 35L/min?
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Old 03-18-2013, 10:54 PM   #15
herman

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yes, no problem.
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