Qingdao Sigma Chemical Ltd is is a global chemical industry manufacturers and suppliers of pharmaceuticals and intermediates, peptide,Nootropis etc API, food and feed additives, herbal extracts, agrochemicals and fine chemicals etc.

 

Our Laboratory is located in shandong province. There are 15 experts in our research team. Talented personnel and well-equipped laboratory makes rigorous and professional quality control possible. Lyphar Biotech is equipped with various detection devices, such as HPLC, GC, Spectrophotometer, AAS, Polarimeter, Auto titrators, BOD Incubators, COD Incubators, Melting point apparatus and so on.

 

The aim of QDSIGMA is a quality policy that "Elements in the system all have been satisfied, Personnel has been trained; Every batch of material is checked, Each procedure guarantees the quality; Every bag of our products is top grade, Service is thoughtful all the time, quality and reputation to increase market share and promote enterprise development. The quality, colors and forms of our products have reached a high level in related chemical industry, which relies on characteristic and advanced processing technology and it has gained a high and reliable reputation from customers at both quality and services.

 

QDSIGMA has become the "Top 500 Chinese manufacturing companies","Top 20 of global chemical sales".QDSIGMA has 21 subsidiaries and holding companies.

 

Product name	cis-1,2,3,6-Tetrahydrophthalic anhydride
Synonyms	cis-4-Cyclohexene-1,2-dicarboxylic anhydride
Molecular weight	152.15
Molecular Formula	C8H8O3
CAS No.	935-79-5
EINECS	213-308-7

 

 

 

 

Item	Specifications	Results
Appearance	White Flakes	White Flakes
Melt Color (Pt-Co), Hazen	≤80	45
Content	≥99.0%	99.7%
Melting Point	100.0 ± 2.0℃	100.8℃
Free Acid	≤1.0%	0.40%
Conclusion	The results conforms with enterprise standards