千住锡丝卤素含有率 0%，这是重视绝缘特性的划时代产品。
    “ZERO”系列是无铅焊锡，是完全不含卤化物的“完全无卤助焊剂产品”。助焊剂中一律不含卤，因此是绝缘电阻值极大的产品，锡焊后的残渣可靠性优越。另外，助焊剂残留由于使用了透明的助焊剂，因此外观检查等也容易，外观漂亮。适合所有重视环保的产品。ZERO 的助焊剂的绝缘特性优越，适合要求高可靠性的产品。
一.基本规格
助焊剂型号                                             相当于 JIS AA 级 相当于 RMA 级 ROL0
卤族元素含有量                                       无（完全无卤产品）
助焊剂含量                                              3 mass% 、4mass%
卤化物含量 [mass%]                                0.02 mass% 以下
铜板腐蚀试验                                          合格
干燥度试验                                             合格
绝缘电阻值                                             1.0E+09 Ω
施加电压耐湿性试验                                不发生离子迁移
扩张率                                                     70％以上
対応線径                                                 φ0.3 ｍｍ ～ φ1.6 ｍｍ
适用合金                                                  M705
推荐烙铁头温度                                       320 ～ 360℃

千住金属发出七种合金的千住锡丝：
M705通用型无铅合金
M53车载用
M35低银通用合金
M20无银通用合金
M82防止手臂侵蚀
M24MT无银校正用
M40低银校正用
配与不同的助焊剂，NEO/LSC/MACROS/FORTE/RMA08/CBF/EFC生科出不同焊锡丝，以应对不同的焊接工艺流程及要求,可靠性稳定，无铅化工艺简单，合金及其杂质易管理等优点，销量一直占据首位，为众多客户之产品。

千住金属松香芯焊锡丝的合金清单，展示了不同合金的熔点温度.
ECOSOLDER 合金成分 (wt%)                      熔融温度 (℃ )     固相线     峰值温度      
                                          
M705 Sn-3.0Ag-0.5Cu                                   217                   219         220 
M30 Sn-3.5Ag                                                221                   223         223
M31 Sn-3.5Ag-0.75Cu                                   217                   219          219 
M714 Sn-3.8Ag-0.7Cu                                   217                   219          220 
M715 Sn-3.9Ag-0.6Cu                                   217                   219          226
M710 Sn-4.0Ag-0.5Cu                                   217                   219          229 
M34 Sn-1.0Ag-0.5Cu                                     217                   219          227
M771 Sn-1.0Ag-0.7Cu                                   217                   219          224
M35 Sn-0.3Ag-0.7Cu                                     217                   219          227 
M20 Sn-0.75Cu                                              227                   229          229
M24MT Sn-0.7Cu-Ni-P-Ge                            228                   230          230 
M24AP Sn-0.6Cu-Ni-P-Ge                             227                   228          228
M805E Sn-0.3Bi-0.7Cu-P                               225                   229           229 
M40 Sn-1.0Ag-0.7Cu-Bi-In                            211                   222           222 
M47 Sn-0.3Ag-0.7Cu-0.5Bi-Ni                       216                   228           228 
M773 Sn-0.7Cu-0.5Bi-Ni                                225                   229           229 
M794 Sn-3.4Ag-0.7Cu-Bi-Sb-Ni-x                 210                   221            221 
M731 Sn-3.9Ag-0.6Cu-3.0Sb                         221                   224            226 
M716 Sn-3.5Ag-0.5Bi-8.0In                           196                    208           214 
M10 Sn-5.0Sb                                                240                    243           243 
M14 Sn-10Sb                                                 245                    248           266
M60 Sn-2.3Ag-Ni-Co                                     221                    222           225 
M770 Sn-2.0Ag-Cu-Ni                                   218                    220           224
M758 Sn-3.0Ag-0.8Cu-Bi-Ni                          205                    215           215 
M806 Sn-3.5Ag-0.8Cu-Bi-Ni                          203                    214           214 
M807 Sn-3.5Ag-0.8Cu-Bi-Ni                          214                    219           219 
M725 Sn-0.7Cu-Ni-P                                      228                    230           230
M84 Sn-3.0Ag-0.5Cu-Ni                                 219                    223           324
M86 Sn-0.3Ag-0.7Cu-Ni                                 220                    232           330 
L-series 固相温度 200℃未満
L20 Sn-58Bi                                                     139                    141           141

千住焊锡丝SPARKLE ESC21 ～ 润湿性(扩散性)良好M705 F3
无铅焊材与一般钖铅焊材比较之下，焊材的润湿性(扩散性)较差是主要的缺点，比较一般钖铅无铅的扩散率约只达到一般钖铅的90%以下。SPARKLE ESC(ECO SOLDER CORED)，是针对无铅化而开发之松香芯钖丝，比较一般的无铅焊材，大幅提高润湿性(扩散性)及切断性，进而实现了可与一般钖铅相同之作业性。SPARKLE ESC21改良了过去产品ESC的作业性，以及润湿性焊材中FLUX的飞溅问题。烙铁头设定在低温时焊接性依然良好，并可延长烙铁头使用寿命。焊接后残渣接近无色透明、外观良好。
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