Standard No.:	GB 8926-1988
English Name:	Used lubricating oils-Determination of insolubles
Chinese Name:	用过的润滑油不溶物测定法
Chinese Classification:	E34    Lubricating oil
Professional Classification:	GB    National Standard
Source Content Issued by:	SINOPEC
Issued on:	1988-3-24
Implemented on:	1989-2-1
Status:	superseded
Superseded by:	GB/T 8926-2012 Standard test method for insolubles in used lubricating oils
Superseded on:	2013-3-1
Abolished on:	2013-03-01
Target Language:	English
File Format:	PDF
Word Count:	3000 words
Translation Price(USD):	60.0
Delivery:	via email in 1 business day

1.1 Method A A sample of used lubricating oil and normal pentane are mixed and centrifuged. The up-layer oil solution is poured out slowly; the deposit is washed twice by normal pentane; after drying and weighing, the normal pentane insolubles are obtained. During determination of toluene insolubles, another sample and normal pentane are mixed and centrifuged. The deposit is washed twice by normal pentane; once by toluene-ethanol solution and once by toluene again. Then dry undissolved substances and weigh; toluene insolubles is obtained.

Contents 1 Method Summary 2 Definition 3 Instrument 4 Reagent 5 Preparation Work 6 Sampling 7 Test Procedures 8 Calculation 9 Precision 10 Report Appendix A Rotational Speed of Various Rotating Diameter Centrifugal Machine (Informative) Additional Explanation