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全系列边界泵送MRV标油，符合ASTM D 3829 和 ASTM D 4684。 Viscosity Standard：N105B Approximate Viscosity in mPa·s (Centipois）:CMRV viscosity standard, 30,000 mPa·s (cP) at –20°C; 56,200 mPa·s (cP) at –25°C
Wittig反应是醛酮与含磷的试剂——烃代亚甲基三苯基膦反应，生成相应的烯类化合物。该反应收率高、反应条件温和，是近年来在有机合成方法上发展较快地反应之一。G. Wittig正是由于此反应及相关的研究荣获了1979年的诺贝尔化学奖。 CAS 产品名称 包装 1779-49-3 甲基三苯基溴化膦 25 g Methyltriphenylphosphonium bromide, 98% 100 g 1560-54-9 烯丙基三苯基溴化膦 25 g Allyltriphenylphosphonium bromide, 99% 100 g 1779-51-7 正丁基三苯基溴化膦 10 g n-Butyltriphenylphosphonium bromide, 99% 25 g 6048-29-9 苯甲酰甲基三苯基溴化膦 25 g Phenacyltriphenylphosphonium Bromide, 97% 13423-48-8 庚基三苯基溴化膦 25 g Heptyltriphenylphosphonium Bromide, 98% 1449-46-3 苄基三苯基溴化膦 25 g Benzyltriphenylphosphonium Bromide, 97% 14114-05-7 环丙基三苯基溴化膦 5 g Cyclopropyltriphenylphosphonium Bromide, 97% 3607-17-8 3-溴丙基三苯基溴化膦 25 g 3-Bromopropyltriphenylphosphonium Bromide, 98% 1034-49-7 溴甲基三苯基溴化膦 5 g (Bromomethyl)triphenylphosphonium Bromide, 98% 25 g 2091-46-5 炔丙基三苯基溴化膦 5 g Triphenylpropargylphosphonium Bromide, 98% 25 g 82105-88-2 4-乙氧苄基三苯基溴化膦 5 g 4-Ethoxybenzyltriphenylphosphonium Bromide, 98% 25 g 4762-26-9 己三苯基溴化膦 25 g Hexyltriphenylphosphonium Bromide, 98% 1100-88-5 苄基三苯基氯化膦 25 g Benzyltriphenylphosphonium chloride, 99% 100 g 4336-70-3 (氰甲基)三苯基氯化膦 25 g (Cyanomethyl)triphenylphosphonium Chloride, 98% 5293-84-5 (氯甲基)三苯基氯化膦 5 g (Chloromethyl)triphenylphosphonium Chloride, 98% 25 g 4009-98-7 甲氧基甲基三苯基氯化膦 25 g (Methoxymethyl)triphenylphosphonium chloride, 98% 4736-60-1 乙基三苯基碘化膦 25 g Ethyltriphenylphosphonium iodide, 95% 2065-66-9 甲基三苯基碘化膦 25 g Methyltriphenylphosphonium iodide, 97% 24470-78-8 异丙基三苯基碘化膦 5 g Isopropyltriphenylphosphonium iodide,98% 25 g 1439-36-7 1-三苯基膦烯-2-丙酮 25 g 1-Triphenylphosphoranylidene-2-propanone, 99% 16640-68-9 (三苯基膦)乙腈 5 g (Triphenylphosphoranylidene)acetonitrile, 98% 2136-75-6 甲酰甲撑基三苯基膦 5 g (Triphenylphosphoranylidene)acetaldehyde, 97% 2605-67-6 (三苯基膦烯)乙酸甲酯 5 g Methyl (triphenylphosphoranylidene)acetate, 98% 25 g
产品名称： VWR瓶口分液器 2-10ML PTFE镀膜活塞 规 格： 612-3669/612-3670/612-3671 产品备注： VWR 产品类别： 通用实验室仪器设备 产 品 说 明 Variable volume, autoclavable The standard PP units with glass cylinder are suitable for aqueous liquids, dilute acids and alkalis - not for use with solvents and hydrofluoric acid which attack PP (for bottles with GL 32 thread). The glass cylinder and PTFE encased glass piston with PP body models are designed for aqueous solutions, weakly concentrated acids, alkaline solutions and crystallising liquids compatible with PP. The amber glass cylinders, clear glass piston with PP body are suitable for light-sensitive liquids, compatible with PP. Valve system with steel spring PP with precision glass cylinder Quick and easy to use volume setting system Additional rotating fine volume adjustment for right or left handed use Adaptor allows rotation of the dispenser on bottles to the desired position Glass cylinders, PTFE encased glass piston with PP body Volume Division Pk Cat. No. 10 - 50 ml 1,00 ml 1 612-3670 2 - 10 ml 0,50 ml 1 612-3669 Glass cylinders with PP standard units Volume Division Pk Cat. No. 10 - 50 ml 1,00 ml 1 612-4751 2 - 10 ml 0,50 ml 1 612-4750 Amber glass cylinders, clear glass piston with PP body Volume Division Pk Cat. No. 10 - 50 ml 1,00 ml 1 612-3672 2 - 10 ml 0,50 ml 1 612-3671 部分商品现货 北京美同达代理美国VWR耗材
KIMTECH PURE® M5 Face Masks, Kimberly-Clark Professional® These nonsterile pleat-style masks filter particles and bacteria. Masks feature a three-layer design with polyester/cellulose inner/outer facing. Double-bagged. Color: blue. Recommended for ISO Class 5 or higher cleanroom environments. Description Supplier No. VWR Catalog Number Unit With Earloops 62692 10815-674 Case of 500 With Soft Ties 62742 10869-020 Case of 300 Pack of 50 VWR® Maximum Protection Cleanroom Face Masks Superior Protection Against Bacteria and Particulates Highly Breathable and Fluid-Resistant Low Particle Shedding Soft and Hypoallergenic Malleable Noseband Ensures Custom, Secure Seal Cleanroom masks feature three-ply construction for superior particle and bacterial filtration efficiency. Available with spandex ear loops or polypropylene ties that are ultrasonically welded to maintain softness and protect against particulates. An encased, 12cm (43/4") malleable steel noseband creates a secure facial seal and improves wearer comfort. Latex-free. Ordering Information: Packaged 50 masks per heat-sealed, cleanroom-compatible bag, 10 bags per case. Masks are rigorously tested and manufactured in an ISO Certified facility under stringent process controls to ensure that each product meets exacting quality standards. Products are validated through independent lab testing. 成分 Bacterial Filtration Efficiency 99.3–99.7% Dimensions 17.5L x 9.5H cm (67/8 x 33/4") Particle Filtration Efficiency 99.0–99.27% 货号 Description Color VWR Catalog Number Unit Mask with Ear Loops Blue 414004-667 Case of 500 Mask with Ties White 414004-669 Case of 500
产品名称： 欧洲药典EP 规 格： EP 产品备注： 产品类别： 标准品 产 品 说 明 《欧洲药典》为欧洲药品质量检测的惟一指导文献。所有药品和药用底物的生产厂家在欧洲范围内推销和使用的过程中，必须遵循《欧洲药典》的质量标准。 《欧洲药典》由欧洲药品质量管理局（EDQM）负责出版和发行，欧洲药典委员会1964年成立。 EP可提供1900多个参考标准品，欧洲药典个论规定并正式有效，包含化学物质、生物制品和对照图谱。 欧洲药典标准品质量和可靠性的保证，EDQM实验室按EP个论规定方法选择和检查参考标准品批号及其制备, 其官方报告由欧洲药典委员会批准。 需注意，欧洲药典标准品由于已通过欧洲药品委员会认证，故标准品不随带证书（见《欧洲药典关于标准品证书的声明》），纯度和有效期见以下介绍。 欧洲药典关于纯度和有效期的说明： 关于有纯度：一般可作为100％使用，详见以下描述。 TOPICS : 03- Ph.Eur. REFERENCE STANDARDS (CRS/BRP) / 01- General / 05. How can I find out the assay/content of a CRS? You can obtain it from our catalogue of reference standards, which is available at http://CRS.edqm.eu. If the content is not required to perform the test(s) described in the Ph.Eur. monograph (see also the FAQ about "What is the intended use of CRS/BRP?"), it is not indicated in the catalogue or on the label (or on the leaflet) and you cannot assume the content of a CRS to be 100% for a quantitative test. However, when an impurity reference standard is used in a related substances test for the control of impurity, if no assigned content is stated on the label, the purity of the reference standard, for the purpose of this estimation, is considered to be 100 per cent. 关于有效期： TOPICS : 03- Ph.Eur. REFERENCE STANDARDS (CRS/BRP) / 01- General / 04. How do we find out the Expiry date of CRS/BRP? No expiry date is indicated as European Pharmacopoeia Reference Standards are monitored regularly. It is down to the user to demonstrate that the CRS/BRP used in an official Ph. Eur. test or assay was current at the time of use. The “information” column of the catalogue may indicate an official date on which the batch is no longer valid as a CRS/BRP. Therefore, it is recommended to purchase only a sufficient amount for immediate need and to use the products as soon as possible. Moreover, the stability of the contents of opened vials or ampoules cannot be guaranteed 北京美同达公司可以提供EP所有系列产品，满足广大客户的使用要求。
VWR® Talon® II Three-Prong Heavy-Duty Extension Clamps Open Yoke Design Choose Single or Dual Adjustment Clamps hold irregular shapes easily. They feature precise pressure regulation to reduce glassware breakage. Open yoke design allows full depth of the clamp to be used, unobstructed by the yoke, springs, or adjusting screws. Narrow profile on single adjustment clamps; variable holding angle on dual adjustment clamps. Design is easy to clean and decontaminate. Distinctive nickel finish for maximum protection against corrosion. Ordering Information: Supplied with non-slip vinyl sleeves, and fiberglass covers for temperatures above 100°C (212°F). 货号 Dual Adjustment Size Length Clamp Extension Grip Size VWR Catalog Number Unit Small 152 mm (6") 102 mm (4") 23 mm (11/4") 21572-804 Case of 10 Each Large 260 mm (101/4") 127 mm (5") 103 mm (41/16") 21572-800 Case of 10 Each Medium 222 mm (83/4") 127 mm (5") 70 mm (23/4") 21572-802 Case of 10 Each Single Adjustment Size Length Clamp Extension Grip Size VWR Catalog Number Unit Small 162 mm (63/8") 102 mm (4") 23 mm (29/32") 21572-805 Case of 10 Each Large 260 mm (101/4") 127 mm (5") 72 mm (213/16") 21572-801 Case of 10 Each Medium 229 mm (9") 127 mm (5") 50 mm (2") 21572-803 Case of 10 Each VWR® Talon® Three-Prong Extension Clamps Large Grip Adjustment Range Three-Prong Construction Choose Single or Dual Adjustment Stainless Steel or Nickel-Plated Zinc Clamps securely hold every type of glassware and apparatus. Long, seamless tubing attaches clamp head securely and offers easy positioning in the deepest fume hoods. Clamps are constructed with round extension arms that allow the clamps to be rotated 360º. Extension arms allow placement of apparatus at various distances from lab frames without compromising the integrity of the experiment. Stainless steel clamps offer exceptional chemical resistance, and are electropolished, made entirely of stainless steel, and autoclavable. Nickel-plated zinc offers a clamp with a high tensile strength at an economical price. Supplied with non-slip vinyl sleeves, and fiberglass covers for temperatures above 100°C. Ordering Information: An additional holder must be purchased in order to attach clamps to frames or other apparatus. 货号 Dual Adjustment Description Material Length Clamp Extension Jaw Size VWR Catalog Number Unit Small Stainless Steel 172 mm (6.77") 102 mm (4") 48 mm (1.89") 12621-240 Each Large, Long Extension Zinc 451 mm (173/4") 305 mm (12") 105 mm (41/8") 97035-504 Each Large Stainless Steel 273 mm (103/4") 127 mm (5") 102 mm (4") 12621-236 Each Medium Stainless Steel 229 mm (9") 127 mm (5") 69 mm (223/32") 12621-238 Each Medium, Long Extension Zinc 406 mm (16") 305 mm (12") 69 mm (223/32") 97035-502 Each Medium Zinc 229 mm (9") 127 mm (5") 69 mm (223/32") 21570-302 Case of 50 Each Small Zinc 168 mm (65/8") 102 mm (4") 46 mm (113/16") 21570-200 Case of 50 Each Large Zinc 273 mm (103/4") 127 mm (5") 105 mm (41/8") 21570-404 Case of 50 Each Single Adjustment Description Material Length Clamp Extension Jaw Size VWR Catalog Number Unit Large Zinc 248 mm (93/4") 127 mm (5") 108 mm (41/4") 21570-127 Case of 50 Each Small Zinc 160 mm (65/16") 102 mm (4") 39 mm (117/32") 21570-125 Case of 50 Each Medium Zinc 218 mm (89/16") 127 mm (5") 71 mm (213/16") 21570-126 Case of 50 Each CLAMP MD. 3-PRONG DA NO YO Dual Adjust. Overall Size: Medium; Length: 8 3/4in. (220mm). Similar to the CG-9205 series with an open yoke to allow full use of the clamp depth 货号 Description VWR Catalog Number Supplier Number Unit CLAMP MD. 3-PRONG DA NO YO 80063-604 CG-9210-05 Each
产品名称： TCI化学试剂 规 格： 日本TCI试剂 产品备注： TCI 产品类别： 化学试剂 产 品 说 明 梯希爱(上海)化成工业发展有限公司(TCI Shanghai)是日本东京化成工业株式会社(TCI)在上海化学工业区独资设立的子公司，公司以东京化成(TCI)60多年积累和打造的独特有机合成技术为基础，建立起了一支年轻的高，中级特殊有机化学合成技术梯队，除了合成TCI现有目录中的试剂，还将不断地研究开发出各种新的有机化学品以满足中国以及世界化学界日益发展的需求。 梯希爱(上海)化成工业发展有限公司(TCI Shanghai)采用东京化成工业株式会社(TCI)创造的世界最快捷的供货系统，以优质的服务，为中国的化学家提供TCI制造的21,000多种特殊有机化学试剂，同时也接受新的有机化学品及各种中间体的委托合成。 梯希爱(上海)化成工业发展有限公司(TCI Shanghai)的宗旨是，用高品质的有机化学试剂服务于各行各业的研究和开发，为中国的化学产业和社会的发展作贡献。 日本TCI产品，主要分为以下几大类别： 有机化学试剂 有机合成试剂 功能性材料研究用试剂 生化试剂 糖链化学研究用试剂 分析试剂 标准物质 大包装 医药品原料·医药中间体 化妆品原料 功能性材料 电子信息材料 委托合成 有机化学中间体 功能性材料 医药品原料·医药中间体 糖链中间体 化妆品原料 色谱柱
物柴生油/柴油混合柴油中的生物柴油含量（FAME）标油通过红外光谱 (IR) 测定柴油燃料中的脂肪酸甲酯 (FAME) 生物柴油含量时，这些标样可用作校准或参考标样，适用于ASTM方法D7371或EN 14078。 .产品描述 产品编号 100% #2 柴油燃料, 20mL BDBLEND-BLK-20 2% (v/v) 生物柴油 溶于#2 柴油燃料, 20mL BDBLEND-2%-20 5% (v/v) 生物柴油 溶于#2 柴油燃料, 20mL BDBLEND-5%-20 10% (v/v) 生物柴油 溶于#2 柴油燃料, 20mL BDBLEND-10%-20 15% (v/v) 生物柴油 溶于#2 柴油燃料, 20mL BDBLEND-15%-20
