Printed Circuit Board with OSP / Entek Surface Finish Printed Circuit Board, Pcb Board,. More like this. Elaiya bharathy. 4 followers. Printed ... ... <看更多>
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Printed Circuit Board with OSP / Entek Surface Finish Printed Circuit Board, Pcb Board,. More like this. Elaiya bharathy. 4 followers. Printed ... ... <看更多>
其實 它就是一種OSP(有機保焊膜, Organic Solderability Preservative),經過化學作用塗佈在銅表面的護銅劑。厚度越厚,保護性原則上會較完整,但是相對的需要較強活性的助 ...
#2. 助焊劑/有機保焊膜Entek/OSP (Organic solderability ...
基板CCL: FR-4. 板厚Board thickness: 1.2mm. 銅厚Copper thickness: 1/1/1/1. 防焊SM: 綠色Green. 表面處理Surface treatment: 助焊劑/有機保焊膜Entek/OSP.
#3. 助焊劑/有機保焊膜Entek/OSP (Organic solderability ...
基板CCL: FR-4. 板厚Board thickness: 0.8mm. 銅厚Copper thickness: 1/0 oz. 防焊SM: 白色White. 表面處理Surface treatment: 助焊劑/有機保焊膜 Entek/OSP.
#4. PCB做板表面处理知识小分享:何谓ENTEK(OSP)? - 电路板
ENTEK 是PCB表面处理的一种方式,其最早为一家生产制造护铜剂的厂商(OSP)。将其产品涂布在铜上面,可以使铜面保有焊锡性。
#5. 保焊剂(OSP)介绍,Entek
保焊剂(OSP)介绍,Entek-印刷电路板铜面有机保焊剂(OSP)介绍.
#6. Organic Solderability Preservative
The ENTEK OSP Verification Program protects the entire supply chain by providing immediate assurance that you are receiving the real ENTEK coating. The program ...
实务问答8-4:. 【问】. 什么是ENTEK?与OSP有差异吗?银胶通孔板于OSP制程时,其铜面是否会因电位差,造成铜面色差问题?有没有改善方法?
#8. 印刷電路板(PCB)表面處理介紹
與OSP一樣,其焊錫性佳,也同樣是各種表面處理焊錫強度指標, 一般ENTEK在乾燥環境下可耐2年,高濕耐3-6個月,但不耐焊接高溫環境. 製造溫度, 260℃, 50℃, 80℃, 240℃, 40℃.
#9. ENTEK PLUS HT - MacDermid Enthone Inc.,Taiwan Branch
產品特色. ENTEK Plus HT organic solderability preservative (OSP) is the industry's most widely used and trusted OSP on the market today. Production-proven to ...
#10. 電路板表面處理的目的?整理幾種常見PCB finish的優缺點
在多種PCB表面處裡中,除了比裸銅板貴一點點之外,就屬OSP最便宜。 具有裸銅板焊接的所有優點,新鮮的板子焊接性良好,過期(三個月或六個月)的板子 ...
#11. ENTEK Plus HT - MacDermid Alpha Electronics Solutions
ENTEK Plus HT 为电路板业界应用最广泛的OSP,深受业. 界信赖。适用于无铅制程的杰出表面处理。经过多次无铅无. 铅回流焊仍保持卓越的焊锡性,具有较高可靠性的BGA焊接.
#12. 有机保焊剂| 最终表面处理| 印刷电路板
MacDermid Enthone ENTEK PLUS HT 为电路板业界应用最广泛的OSP,深受业界信赖。
#13. 電路板在表面處理製程上無鉛化之因應
關於有機保焊膜(Organic Solderability Preservatives;簡稱OSP)表面處理技術,早在1960年代美商Enthone 公司即開發出「Entek ... OSP系列,以Aryl Phonylimidazole類材料 ...
#14. Introduction about OSP/ENTEK
Introduction about OSP/ENTEK. Organic Surface Protectant (OSP) is a type of water based, organic surface finish that is typically applied to copper pads on ...
#15. osp entek plus cu106a - SMT Electronics Manufacturing
Choose from osp entek plus cu106a products, companies, forum discussions and technical articles - over 32 results.
#16. OSP / Entek OSP (Organic Solderability Preservative) or ...
OSP / Entek OSP (Organic Solderability Preservative) or anti-tarnish preserve the copper surface fr'om oxidation by applying a very thin ...
#17. PC Board Practice, ENIPIG, ENEPIG, ENIG, OSP, HASL ...
OSP : Bare copper (Entek 106 Organic Solder Preservative); ENIG: 5 micro-inches (0.127µm) Immersion Gold over 150 micro-inches (3.8µm)electroless nickel. Hard ...
#18. PCB有机保焊剂(OSP)与Pad金面污染
业界俗称的Entek 是指美商Enthone 公司近年来所提供一种“有机护铜剂”之湿制程技术,目前正式的商品名称是Entek Plus CU-106A。
#19. PCB表面處理-ENTEK-PCB小教室| 帝亮電子有限公司
為因應各式後續加工 ... , OSP是印刷電路板(PCB)銅箔表面處理的符合RoHS指令要求的一種工藝。 OSP是Organic Solderability Preservatives的簡稱, 中譯為有機保焊膜,又 ...
#20. Printed Circuit Board Surface Finishes
Printed Circuit Board with OSP / Entek Surface Finish Printed Circuit Board, Pcb Board,. More like this. Elaiya bharathy. 4 followers. Printed ...
#21. 2 layer Entek OSP PCBs with black board for LCD,best ...
Quality 2 layer Entek OSP PCBs with black board for LCD,best quotations from PCB Manufacturer,UL, SGS and RoHS Marks,quick turn services with free worldwide ...
#22. 最新消息 - 全葳科技JetPCB-專業PCB印刷電路板樣品製造
有機護銅(保焊)膜ENTEK/ OSP, 約0.4μm. 化鍚Immersion Tin (ImSn). 約30~40μ". 化銀Immersion sliver (ImAg). 約6~8μ". 化金(軟金) Immersion gold, 約3~5μ", 12μ", 一般化 ...
#23. Organic solderability preservative comprising high boiling ...
The three OSP compositions comprising tetrahydrofurfuryl alcohol and Enthone Inc.'s Entek® Plus HT formula were used to deposit OSP films over copper substrate.
#24. 无铅焊接的表面处理之OSP-诺的电子
Enthone企司利用Azole化学品(例如Benzo-Triazole)对铜面的保护技术,亦即业界知名的商品Entek,此乃出自IBM当年所最早使用的CU-56的暂时水性护铜剂。此 ...
#25. 有機保焊劑與金面污染
不幸當板面已有金手指或其他局部金面時,則經過OSP(Entek)流程後,該等鍍金表面上也會生長出一層薄淺棕色的異常皮膜,雖然在插接或壓迫接觸過程(Press-Fit)中,尚不致造成 ...
#26. PCB Surface Finishes Low Temperature Solder Processing
Designed to provide OSP users the benefits of a metallic surface finish. Page 4. Technology. SEM at 250K Magnification. ENTEK OM - Organic ...
#27. 常見問題 - 陸裕興業股份有限公司
PCB製程工序多,並非每家PCB廠都有全製程設備內製,陸裕是否有那些製程是必需外包的? 成品表面處理:ENIG(化金),HASL噴錫與OSP(ENTEK) 及鍍銅(PTH) 必需外包;其餘皆有 ...
#28. Rigid Printed Circuit Board | 電子元器件
Finishing: OSP ENTEK. Solder mask: green color. Motor PCB. Push back tooling step motor PCB. Halogen free PCB. Robust construction. Long ...
#29. Enthone awarded Patent on ENTEK® PLUS organic ...
The OSP is part of the ENTEK PLUS gold copper protective coating ... ENTEK PLUS CU-106A(X) OSP to the PCB. The final aqueous coating provides ...
#30. Corrosion protection mechanisms of Organic Solderability ...
but the oxidation of the copper surface under the OSP layer (OSP/Cu interface) at 85 °C. 10.4 Conclusions: Influence of OSP during electronic assembly. A ...
#31. 2: General benzimidazole molecule used in the Entek plus ...
Entek plus HT protection layer. from publication: Corrosion protection mechanisms of Organic Solderability Preservatives (OSP) on Printed Circuit Boards ...
#32. Printed Circuit Board Surface Finishes - Advantages and ...
HASL / Lead Free HASL · Immersion Tin · Immersion Silver · OSP / Entek · Electroless Nickel Immersion Gold (ENIG) · Electroless Nickel Electroless Palladium ...
#33. DFM 101: Final Finishes—OSP - PCBDesign007
This finish is not being utilized much anymore because of the use of mixed technology boards (SMT and through-hole). ENTEK CU-106A: This is the ...
#34. NEW, HIGHEST RELIABLE GENERATION OF PWB ...
ENTEK ® PLUS CU-106A(X) HT is the industry's next generation OSP that has ... OSP. The SACX0307 exhibited a slightly better circumferential wetting. Through ...
#35. PCB表面OSP处理及化学镍金简介
ENTEK 106A (ENTHON). MEC CL-5708 (MEC). MEC CL-5800(MEC). 甲酸调整系统:. SCHERCOAT CUCOAT A. KESTER. 大半药液为使成长速率快而升温操作,水因之 ...
#36. High Density Printed Circuit Boards in a Best-cost Region
• OSP (Entek plus HT). • Immersion Tin. • Immersion Silver. • Lead Free HASL & Leaded HASL. Logistic Services. • Consignment. • Warehousing. • Customer Service ...
#37. 【smt资料】pcb印制电路板osp板介绍知识分享- 豆丁网
... 大学课件. 系统标签:: osp smt 电路板 pcb entek 焊剂. 31REVISIONJan.12,1999ENTEKPLUSCU-106A有机保焊剂(OrganicSolderabilityPreservatives;OSP) ...
#38. FR4-PCB - TRULY ELECTRONICS MFG., LTD.
Name: FR4-PCB Material/thickness: 1-10 Layers FR4 Line Width/space: 0.1/0.1mm. Min. Treatment: HASL, Lead free HASL, Plating Ni/Au, Flash Gold, OSP, Entek, ...
#39. ESD4-LFC
OSP (Entek Cu Plus 106A). Tolerance - Edge To Corner Ball. ±50µm. Solder Ball Side Coplanarity. ±20µm. Maximum Dwell Time Above Liquidous (183°C). 60 seconds.
#40. Our Products
OSP, ENTEK, HAL Pb Free, NiAu ENIG & Chemical Sn. Techonology, Silver, Carbon and Copper Plated Through Holes. MULTI LAYERS. Material, FR4, FR4 HIGH TG, HIGH ...
#41. Entek starts local stroking of OSP-E electromechanical ...
Entek starts local stroking of OSP-E electromechanical actuators on behalf of Parker Hannifin.
#42. CAVE 3 Review
Alpha OM-338T Pb-Free Solder Paste Wetted to Entek OSP Board Finishes · Alpha SAC 105 Solder Alloy Wetted to Entek Plus OSP (no flux) · Alpha SAC 105 Solder ...
#43. What we do
Organic Solderability Preservative (OSP) / ENTEK. Flash Gold(Hard Gold plating). ENEPIG. Selective Gold Plating, Gold thickness up to 3um(120u"). Gold Finger ...
#44. 2-8 Layers OSP PCB, RoHS
2-8 Layers OSP PCB, RoHS, Find Details about Entek, Osp from 2-8 Layers OSP PCB, RoHS - Tip Top Printed Circuits Ltd.
#45. 產品介紹
Entek (OSP). 應用, 無線模塊. 層, 4層HF. 厚度, 0.4毫米. 表面, 化金. 應用, 工業主機板. 層, 10層HDI 1+8+1. 厚度, 1.0毫米. 表面, 化金+金手指. 應用, LED COB ...
#46. 竣美科技有限公司- 最新職缺徵才簡介
竣美科技有限公司簡介:我司是印刷電路板表面處理代工廠,廠內製程有OSP, ENTEK OM,化學銀,化學錫,客戶為全國各大印刷電路板廠.。應徵竣美科技有限公司工作職缺機會, ...
#47. Surface technology
Immersion Silver Solderable Nickel-free surface, therefore particularly suitable for high frequency products. OSP (Entek Plus 106 A (X)) Solderable Nickel ...
#48. PCB Osp Plating
ORGANIC SOLDERABILITY PERSERVATIVE -OSP (Entek-Plus 106A) Certifications. Printed Circuit Board PCB Half Hole Plating Gold. OSP PCB Technology - King Sun ...
#49. 製程能力 - 瀚宇博德股份有限公司
OSP ( Entek ), YES. Immersion Tin, Out Sourcing. Carbon Ink, YES. Plating Silver, For light reflection and wire Bond. Immersion Silver, YES. Lines, Spaces & Pad ...
#50. Flexible Printed Circuit Board (FPC) Manufacturer and ...
OSP (Entek), ENEPIG. STIFFNERS. Epoxy Glass, Aluminum. Polymide, Stainless Steel. MATERIAL. FR-4, Polymide. FR-5, BT. Teflon, Aluminium. If you are looking for ...
#51. PCB表面处理-抗氧化OSP - 深圳市广大综合电子有限公司
... OSP. PCB表面处理-抗氧化OSP. 47次阅读. 抗氧化保护膜(ENTEK). 目的:1.抗氧化性. 2.低廉的成本. 原理:金属有机化合物与金属离子间的. 化学键作用力. 主要原物料:护铜 ...
#52. OSP electronics board | Caring Circuit
OSP / Entek. Organic Solderability Preservative is more and more popular for electronics board because of easy process and low cost.
#53. entek plus cu 106a Datasheets
2005 - Not Available. Abstract: No abstract text available. Text: OSP( Entek Cu Plus 106A ) ±50µm ± ...
#54. 鴻碩資訊股份有限公司
OSP (entek)( 有機保焊 ). Yes. Soft Gold ( 軟金 ). Yes. Selective Immersion Gold ( 選擇化金 ). Yes. ELECTRICAL TEST ( 測試 ). Net list extraction ( Net list 取出 ).
#55. 印刷电路板流程介绍
... (Entek Cu 106A) 外層製作(OUTER-LAYER) TENTING PROCESS 鍍金手指(G/F PLATING) 鍍化學鎳金(E-less Ni/Au) For O. S. P. ... O S P (Entek Cu 106A) HOT AIR LEVELING G/F ...
#56. which surface finish for PCB - PCB Prototype
OSP (Organic Solderability Preservative) or Entek or passivation is an organic finish that bond with copper. It is probably the most eco-friendly surface ...
#57. PCB Finishing Processes
Enthone OSP-Entek Plus. This alternative surface finish is organically produced, making it an eco-friendly and non-lead choice for our customers' printed ...
#58. OSP The High Performance Surface Finish | PDF
+ ENTEK PLUS + + +. SOLDER JOINT RELIABILITY $ Three-Point Bend Test – 0.045” thick FR-4, BGAs with 41 I/O (0.52” x 0.47”) – PWBs coated with ENTEK PLUS, HASL ...
#59. Organic Solderability Preservative Evaluation
treatment (bare copper PWBs, OSP-coated PWBs, and HASL PWBs). One supplier (Enthone ... utilized with the Enthone/OMI ENTEK Plus CU-106A OSP coating was. PC-4 ...
#60. PCB Fabrication Technology Roadmap - Imagineering, Inc.
Technology Roadmap ; Buried/Blind Via, 10+N+10 (HDI) ; Plasma Desmear, Yes ; Outline Tolerance, +/-.004 ; Surface Finish · HASL · ENIG · Immersion Silver · OSP (ENTEK)
#61. DFM 101 Final Finishes: OSP
There are a couple of common OSP finishes widely used in the industry: ENTEK CU-56: This is used for assemblies that will only go through a ...
#62. Entek有机保焊剂与金面污染技术- 电子制造(工艺指南)
此等OSP 制程的反应原理,是“苯基三连唑”BTA(Benzo-Tri-Azo)之类的化学品,在清洁的铜表面上,形成一层错合物式具保护性的有机物铜皮膜(均0.35μm或14μin)。
#63. 16 layers Rigid PCB (Blind & Buried)
... OSP (Entek), Immersion gold / silver / tin, gold, finger and other surface treatment processes. Terms and Conditions | Privacy Policy | Contact Us ...
#64. 5 Types of PCB Surface finishing
PCB surface finishing HASL, Immersion White Tin, OSP (Organic solderability preservatives)/ Entek, Electroless Nickel Immersion Gold (ENIG), ...
#65. Services
Various surface finishes including ENIG, hard gold, leaded and lead-free HASL, immersion tin, immersion silver, OSP/Entek; FR4 fiberglass, aluminum, ceramic ...
#66. PCB200-15mm-TC (Package on Package) 15mm Board ...
180Tg. * Standard board finish is OSP Entek CU-106A-HT. * 15 daisy-chain pad placements for 15x15 604 PSvfBGA?component.
#67. Rework for OSP Assemblies
According to Enthone, the manufacturer of the Entek Plus 106A OSP coating, the coating is more susceptible to certain types of "solvents" than ...
#68. Lead Free Solder Alternatives
OSP (Entek 106). Pd/Ni, Pd-Ni/Pd, Pd-Ni/Au. 97.5Sn, 2.5Ag. Organo Silver. Ni/Au. Sn, 3.5Ag, 0.5Cu. Immersion Ni/Au or Ni/Pd. 99.0Sn, 1.0Cu. Sn, 3.5Ag, 3Bi. HASL ...
#69. Flex PCBs
Flexible PCB Capabilities & Tolerances ; Lead Solder (HASL). OSP (Entek) ; Lead Free Solder (HASL). Electrolysis gold plating ; Immersion Gold (Electroless Nickel ...
#70. High Frequency PCB
... OSP(Entek), Immersion Tin,ImmersionSilver,Hard Gold. Selective Surface Treatment, ENIG(immersion Gold)+OSP, ENIG(immersion Gold)+Gold Finger ...
#71. (12) 发明专利申请
其耐热性已. 经可以承受2次的回流处理(但多次加热后需要较强的助焊剂)。SBA 是目前OSP 供应的主. 流,如Enthone Entek 106 和Shikoku F2工艺,成本低于传统的HASL,所以在锡 ...
#72. "Evaluation of Nickel/Palladium-Finished ICs With Lead- ...
To evaluate Pb-free solder joints, an OSP, ENTEK PLUS CU-106A, was used to coat the PWB pad. This coating is a substituted benzimidazole that preserves ...
#73. OSP工艺的注意事项
Entek 有阻值影響,ASSEMBLY後,注意測試問題, 建議使用尖針或爪針測試(只作 ... OSP(Organic Solderability Preservatives)有机保焊剂 简单的说OSP就是在 ...
#74. (PDF) Entek Plus CU-106A
ENTEK Plus HT · 2017. 6. 22. · ENTEK Plus HT organic solderability preservative (OSP) is the industry's most widely used and trusted OSP on the market today.
#75. 製程能力| BRIGHTEN STAR TECHNOLOGY CO., LTD.
... ENTEK(OSP). ·軟板PCB製程能力. 基板使用:Polyimide. 最大工作面積: 10"×15.8"(250 ... ENTEK(OSP). 覆蓋膜材質: PI、Flexible Solder Mask. 補強片材質: PI、FR4 and ...
#76. PCB Technology - Storm Circuit
HASL ,HASL Lead Free, Immersion Gold, ENEPIG,Immersion Tin , OSP (Entek), HAL+Gold fingers,,Immersion Sivler. Special, Burreid vias,blind vias,Countersunk ...
#77. Surface Finishes
OSP [Entek (Lead free assembly compatible)]. Sub-contracted. Hard Gold. Edge Connector. Soft Gold. Sub-contracted. All-over gold (Electroplate - hard) (Non ...
#78. PCB Assembly Services Capabilities
... OSP, Carbon, etc. 7, Max gold plating thickness, 50 microinch. 8, Min ... HASL(LF), Gold plating, Electroless nickel immersion gold, Immersion Tin, OSP(Entek) ect ...
#79. 電子產品中鉛的使用及其替代物
OSP 墊片處理技術,早在1960年代就有Enthone 公司開發「Entek處理法」,利用苯基連三連唑(BTA)材料在銅墊片加一層有機保護膜,到第四代OSP材料-衍生式苯基咪唑(SBA ...
#80. 聚焦丨無鉛焊接的表面處理之OSP
... OSP。 Enthone企司利用Azole化學品(例如Benzo-Triazole)對銅面的保護技術,亦即業界知名的商品Entek,此乃出自IBM當年所最早使用的CU-56的暫時水性 ...
#81. ICI Rigid Flex Aluminum PCB Manufacturing Capabilities.xlsx
OSP (Entek), peelable mask. ENEPIG (Electroless Nickel, Palladium, Gold). Wire Bondable (99.99% Pure Gold) Flash/Soft/Hard Gold. Carbon Ink. Gold Finger (Hard ...
#82. RoHS - pcb shine
OSP / ENTEK,; Gold Plating... Electroless Ni / Immersion Au. OSP / ENTEK. Immersion Tin. Lead free HASL. Halogen free laminate. TAB plating+Immersion silver. If ...
#83. PCB Capability
... OSP(Entek), Immersion Tin,ImmersionSilver,Hard Gold. Selective Surface Treatment, ENIG(immersion Gold)+OSP, ENIG(immersion Gold)+Gold Finger,Flash Gold +Gold ...
#84. Rigid PCBS
O.S.P. (Entek 106HT); Carbon Ink; Full Body Gold; ENEPIG; Selective Surface Finish Combinations. Current Capabilities. Copper. Up to 8oz. external; Up to 6 oz ...
#85. PARKER OSP-E..B Elektrikli İş Elemanları
PARKER OSP-E..B Doğrusal hareket için kaymalı yataklı iş elemanı Türkiye'de montaj sayesinde çok kısa teslim süresi.
#86. Printed Circuit Board Surface Finishes - Advantages And ...
OSP /Entek. Advantages; Disadvantages. Electroless Nickel Immersion Gold (ENIG). Advantages; Disadvantages. Gold - Hard Gold. Advantages; Disadvantages.
#87. 240785
... wetting characteristics on all common surface finishes (including Entek HT OSP). JIS Spread 88.6% on Entek HT OSP. Cleanable with water based cleaning systems.
#88. PCB
LF-HASL/HASL/Immersion Gold/Immersion Tin/OSP(Entek )/Carbon Ink /ENIG. Lines, Spaces & Pad Diameters. Inner Layer Line Width, 5 mil, 4 mil.
#89. PCBFABEXPRESS Printed Circuit Boards and PCB ...
Surface Finishes. HASL (Vertical or Horizontal) OSP (Shikoku F2) OSP (Entek) ENIG Immersion Silver Immersion White Tin Tin Nickel Electrolytic Soft Au
#90. PCB Fabrication
PCBs are upto 32 layers and various surface finish like HASL, HASL Pb free, immersion gold, immersion silver, immersion tin, O.S.P (Entek), S/G plating ...
#91. 金鹏电子制程能力
Printing ink:TAIYO/Eternal/ABQ/Sekisui. 油墨:太阳、长兴、板桥、积水 ; Surface Finishing. 表面处理 ; HASL,HASL Leadfree,ENIG(ImmersionGold),OSP(Entek),
#92. Printed circuit boards technical capabilities and specifications
... OSP(Entek), Immersion Tin, Immersion Silver, Hard Gold. Selective Surface Treatment: ENIG (Immersion Gold) + OSP, ENIG (Immersion Gold) + Gold Finger, Flash ...
#93. PCB Osp Shelf Life
OSP / Entek Organic Solderability Preservative Typical thickness: 4 micro ... Lead Free HASL -Immersion Tin -Immersion Silver -OSP / Entek. OSP (Organic ...
#94. PCB Osp Shelf Life
OSP / Entek Organic Solderability Preservative Typical thickness: 4 micro ... Lead Free HASL -Immersion Tin -Immersion Silver -OSP / Entek General Knowledge ...
#95. BIOS - PROBOOK U12 SERIES PCB 316786000012 TF- ...
PROBOOK U12 SERIES PCB 316786000012 TF-PCB PWA-SHIRE (AMD) , MB , R01 T=1.2MM ,OSP (ENTEK) 8LAYER $BTS D2381B33 OLD bord pictures ınsıde do ...
#96. PCB Osp Shelf Life
Lead Free HASL -Immersion Tin -Immersion Silver -OSP / Entek General Knowledge ... OSP / Entek Organic Solderability Preservative Typical thickness: 4 micro ...
#97. The introduction of different PCB surface finishing
OSP /Entek-Organic solderability preservatives. OSP also called Preflux, which is a method for coating of printed circuit boards. It uses a ...
#98. 表面处理之OSP及化学镍金简介
We have no OSP Process. 什么意思? 请教:OSP比较正式的中文翻译是什么? 请教:OSP板材的检验规范和制程管控要点. OSP与ENTEK有 ...
osp entek 在 OSP / Entek OSP (Organic Solderability Preservative) or ... 的必吃
OSP / Entek OSP (Organic Solderability Preservative) or anti-tarnish preserve the copper surface fr'om oxidation by applying a very thin ... ... <看更多>