... thick when delivered. During storage, the diffusion of copper in the tin surface continues, causing the thickness of the pure copper or tin layers | MULTILAYER CIRCUIT BOARDS MAKER | to decrease. If the blended metal reaches the surface it becomes coated with a non-removable oxide, making soldering impossible. Storage possibilities of immersion tin PCBs | MULTILAYER CIRCUIT BOARDS MAKER | are, for this reason, considerably limited compared with conventional SnPb techniques: stored PCBs should be used up within 3 months and if time exceeds 6 | MULTILAYER CIRCUIT BOARDS MAKER | months, heavy processing problems can occur. The melting temperatures are markedly higher compared with SnPb, therefore the assembling process for many components takes place at | MULTILAYER CIRCUIT BOARDS MAKER | the absolute limits of acceptance. As a result, component losses must be expected when assembled. The price of immersion tin is between that of the | MULTILAYER CIRCUIT BOARDS MAKER | classical SnPb and the immersion nickel gold surfaces. However, thiourea, which is used in the production, does not conform with environmental or effluent requirements, therefore | MULTILAYER CIRCUIT BOARDS MAKER | the future ...
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... | PRINTED CIRCUIT BOARDS Dear Sir or Madam, welcome to our client-service-forum for printed circuit boards! Here we have chosen specific topics you have | MULTILAYER CIRCUIT BOARDS MAKER | ask for to help you finding a suitable answer. Please click a topic below to view frequently asked questions in that topic. Bank account foreign | MULTILAYER CIRCUIT BOARDS MAKER | country > What are the details? PayPal (PP) > What are the advantages of this payment method ? Direct Debit (DB) only valid in Germany | MULTILAYER CIRCUIT BOARDS MAKER | > What does this means ? Payment in advance (PA) > When are you starting wiht the production? Payment Method > Wich options i have? | MULTILAYER CIRCUIT BOARDS MAKER | PayPal (PP) > What are the advantages of this payment method ? You may also be interested in... Password > Which syntax is permitted? Value | MULTILAYER CIRCUIT BOARDS MAKER | Added Tax (VAT) > When will it be charged? On-line Ordering > What means | PRINTED CIRCUIT BOARDS | status of 1,2 etc.? If one | MULTILAYER CIRCUIT BOARDS MAKER | of your | QUESTIONS | could not be answered, send us please your question by the form for contact, or call: (++49)- 21 ...
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... fab analysis tool and run through their paces. Clearances are good. No possible soldermask flaking. Spacing between the drills is just right. You hand | MULTILAYER CIRCUIT BOARDS MAKER | the data set to the fabricator, and voila! No unexpected phone calls, no changes in the layout, and the fabricator happily sends back a good | MULTILAYER CIRCUIT BOARDS MAKER | set of boards on time. Our recommendations for the correct storage of PCBs and MLBs A.1 ) Brief desricption of the problem: PCB`s, especially Multilayer | MULTILAYER CIRCUIT BOARDS MAKER | boards are extremly sensitive towards moisture The microscopic structure of the Multilayer material develops a strong capillary power that soaks up the humidity of the | MULTILAYER CIRCUIT BOARDS MAKER | surrounding air. Even under very dry conditions it is a question of time that water accumulates in the stored PCB`s. For example: At storage conditions | MULTILAYER CIRCUIT BOARDS MAKER | of 20 C° and 35 % of humidity the weight of the epoxyraisin of the Multilayer PCB`s rises 0,12 % due to the accumulation of | MULTILAYER CIRCUIT BOARDS MAKER | moisture. If the capillary effect leads to an increase of more than 0,17 % a gas pressure of 8-10 bar can ...
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