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RoHS Compliance PCB

RoHS Compliance PCB

Rohs compliance PCB 1.product describe Traditional sepcification Material: FR - 4 Minimum line width/line distance: 4mil/4mil. Minimum aperture: 0.15mm. Surface treatment: imerssion gold. Sheet thickness:1.2mm Uniwel was established in 2007, Uniwell is a leader in providing an extensive array of...

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Rohs compliance PCB
1.Product describe


Traditional specification
Layer: 4Board Thickness: 0.8 mm
Surface treatment:immersion gold.
Material: FR4 TG170 .
Min line width/line distance:6/6mil
Min hole:0.2mm
Uniwel was established in 2007, Uniwell is a leader in providing an extensive array of lead free printed circuit board solutions since it was established. Uniwell's lead free products are fully RoHS compliant.

2.RoHS restricted materials

Banned Substance


Lead (Pb)


Mercury (Hg)


Cadmium (Cd)


Hexavalent Chromium (Cr+6)


Polybrominated Biphenyl (PBB)


Polybrominated Diphenyl Ether (PBDE)


* MCV - Maximum concentration values allowed in homogeneous materials

3.Environmental responsibility
Uniwell is a leader in Printed Circuit Board solutions and is committed to taking an active role in working closely with our customers and suppliers to identify and rapidly eliminate hazardous substances from their products. As an ISO 9001 registered company, Uniwell is fully supportive of electronics industry efforts throughout the world to phase out the use of lead and other undesirable elements.


4.Little knowledge about Rohs
The fundamental principle of the European RoHS guideline¹ is that as of 1-July-2006, all electronic devices introduced to the market may not contain lead or certain other hazardous substances. This applies to the following products:
● Household appliances
● IT and telecommunication equipment
● Consumer electronics
● Lighting devices
● Electrical and electronic tools (except for large, stationary industrial devices)
● Toys, recreational and sporting articles
● Vending machines

For circuit boards, RoHS compliance is controlled by two components: The base material  (including solder-stop and marking print) and the surface finish.
The respective manufacturers (Isola, Peters, etc.) have confirmed the RoHS compliance of our base materials without any limitations.
The PCB surface finish is selected by the customer. In addition to the HAL SnPb surface (which contains lead, but is still permitted in some cases²), the following lead-free surfaces are available from Multi PCB
● Immersion tin
● Immersion silver
● Immersion gold (ENIG)
● HAL lead-free

If you have been ordering your circuit boards with HAL SnPb (lead-tin) surfaces up to now, you may select one of these lead-free surface alternatives in the future; the normal choices are immersion gold or HAL lead-free. 
The immersion gold surface has increasingly become a more popular alternative to HAL, because its planar (flat) character makes it ideally suited for SMD.
RoHS (Restriction of the use of certain Hazardous Substances) limits the use of the following materials in electrical and electronic devices: lead, mercury, cadmium, chromium, the flame retardants polybrominated biphenyl (PBB) and polybrominated diphenyl ether (PBDE), bis(2-ethylhexyl) phthalate, benzyl butyl phthalate, dibutyl phthalate and diisobutyl phthalate.

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