定价： 590元 加购物车

定价： 590元 加购物车

定价： 590元 加购物车

定价： 515元 加购物车

定价： 590元 加购物车

定价： 515元 加购物车

This specification covers the requirements fro wrought zirconium-2.5niobium alloy for use in surgical implant applications. The material shall be manufactured into bars or wires by multiple vacuum melting in arc furnaces, by electron beam melting, or by other melting processes conventionally used for reactive metals. The material shall be in the annealed condition, with the surface descaled or pickled, abrasively blasted, chemically milled, ground, machined, peeled, or polished. Heat and product analyses and tests for tensile strength, yield strength, and elongation shall be performed and shall conform to the requirements specified. In addition, the material shall have a microstructure consisting of a fine dispersion of the alpha and beta phases as a result of processing in the alpha plus beta field, with no coarse, elongated alpha platelets.1.1 This specification covers the chemical, mechanical, and metallurgical requirements for wrought zirconium-2.5niobium alloy to be used in the manufacture of surgical implants (1).21.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

定价： 515元 加购物车

5.1 The crystallinity of UHMWPE will influence its mechanical properties, such as creep and stiffness. The reported crystallinity will depend on the integration range used to determine the heat of fusion, and the theoretical heat of fusion of 100 % crystalline polyethylene used to calculate the percent crystallinity in an unknown specimen. Differential scanning calorimetry is an effective means of accurately measuring both heat of fusion and melting temperature.5.2 This test method is useful for both process control and research.1.1 This test method discusses the measurement of the heat of fusion and the melting point of ultra-high-molecular weight polyethylene (UHMWPE), and the subsequent calculation of the percentage of crystallinity.1.2 This test method can be used for UHMWPE in powder form, consolidated form, finished product, or a used product. It can also be used for irradiated or chemically-crosslinked UHMWPE.1.3 This test method does not suggest a desired range of crystallinity or melting points for specific applications.1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

定价： 515元 加购物车

定价： 590元 加购物车

This specification specifies the minimum strength requirements for anchorages permanently installed or attached to training towers or other structures used for rope rescue training. It specifies the design loads that must be considered and does not describe how those anchorages are constructed, installed in, or attached to the structure nor does it include any factors of safety. Each anchorage shall be designed to hold a minimum of 40 kN in all directions of potential loading and shall be manufactured in such a way that a carabiner with a gate opening of 25 mm or greater shall fit around it and the gate shall be able to close and lock. The anchorage shall be constructed using rounded stock or with beveled or chamfered edges to minimize damage to hardware, rope, or webbing that is attached to the anchorage.1.1 This standard specifies the minimum strength requirements for anchorages permanently installed or attached to training towers or other structures used for rope rescue training. It does not describe how those anchorages are constructed, installed in, or attached to the structure nor does it include any factors of safety. It only specifies the design loads that must be considered.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

定价： 515元 加购物车

定价： 590元 加购物车

定价： 590元 加购物车

定价： 515元 加购物车

定价： 515元 加购物车

定价： 515元 加购物车