Standard No.:	GB/T 7123.1-2015
English Name:	Determination of the working life of multi-component adhesives
Chinese Name:	多组分胶粘剂可操作时间的测定
Professional Classification:	GB    National Standard
Source Content Issued by:	AQSIQ; MOH
Issued on:	2015-12-31
Implemented on:	2016-7-1
Status:	valid
Superseding:	GB/T 7123.1-2002 Determination for working life of adhesives
Target Language:	English
File Format:	PDF
Word Count:	5500 words
Translation Price(USD):	130.0
Delivery:	via email in 1~3 business day

GB/T 7123.1-2015 Determination of the working life of multi-component adhesives 1 Scope This part of GB/T 7123 specifies methods for determining the working life of multi-component adhesives. This part is applicable to the determination of the working life of multi-component adhesives. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 2790 Adhesives specimen assembly , 180° peel strength test method for a flexible-bonded-to-rigid test (GB/T 2790-1995; ISO 8510-2: 1990, EQV) GB/T 2791 Adhesives - T peel strength test method for a flexible-to-flexible test specimen assembly GB/T 2794-2013 Determination for viscosity of adhesives - Single cylinder rotational viscometer method GB/T 2943 Terms of adhesive GB/T 7124 Adhesives - Determination of tensile lap-shear strength of rigid-to-rigid bonded assemblies (GB/T 7124-2008; ISO 4587: 2003, IDT) GB/T 20740 Adhesive - Sampling (GB/T 20740-2006; ISO 15605: 2000, IDT) 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 2943 and the following apply. 3.1 working life period of time during which a multi-component adhesive can be used after its component parts have been mixed 4 Method classification The types of test methods for determining the working life of multi-component adhesives and the instructions for use are shown in Table 1. Table 1 Types of test methods for determining working life of multi-component adhesives and instructions for use Method No. Method abbreviation Instructions for use Method I Method by rotational viscometer Not suitable for determination of adhesives with working life less than 5min Method II Extrusion method Not suitable for determination of adhesives with working life less than 5min Method III Spreading method Suitable for the determination of multi-component adhesives Method IV Viscous method Suitable for the determination of multi-component adhesives Method V Reaction temperature method Suitable for the determination of multi-component adhesives with changes in reaction temperature Method VI Bonding strength method Not suitable for determination of adhesives with working life less than 5min 5 Principle Method I Method by rotational viscometer: the working life is determined from the increase in viscosity of the adhesive as it reacts. This method is not suitable for the determination of working lives that are shorter than 5 min. Method II Extrusion method: the working life is determined from the decrease in the mass of extruded adhesive mixed under standard conditions and within specified period. This method is not suitable for the determination of working lives that are shorter than 5 min. Method III Spreading method: the working life is determined as the time taken to reach a point when the mixed adhesive can no longer be spread by hand. Method IV Viscous method: the working life is determined as the time taken to reach a point when the surface of the mixed adhesive is no longer tacky, i.e. it is dry to the touch. Method V Reaction temperature method: the working life is determined as the time taken by the mixed adhesive to reach the maximum temperature.  

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Method classification 5 Principle 6 Apparatus 7 Test environment 8 Procedure 9 Expression of results 10 Test report