Sodium sulfide, wani sinadari mara tsari wanda kuma aka sani da alkali mai wari, soda mai wari, alkali mai rawaya, ko alkali mai sulfide, foda ne mai launin crystalline mara launi a cikin siffarsa ta tsarki. Yana da hygroscopic sosai kuma yana narkewa cikin ruwa cikin sauƙi, yana samar da ruwan da ke nuna halayen alkaline sosai. Taɓawa da fata ko gashi na iya haifar da ƙonewa, don haka sunan da aka saba kira "sulfide alkali." Lokacin da aka fallasa shi ga iska, ruwan da ke cikin sodium sulfide yana yin oxidize a hankali don samar da sodium thiosulfate, sodium sulfite, sodium sulfate, da sodium polysulfide. Daga cikin waɗannan, ana samar da sodium thiosulfate cikin sauri, wanda hakan ya sa ya zama babban samfurin oxidation. Sodium sulfide kuma yana da saurin narkewa da carbonation a cikin iska, wanda ke haifar da ruɓewa da ci gaba da sakin iskar hydrogen sulfide. Sodium sulfide na masana'antu sau da yawa yana ɗauke da ƙazanta, yana ba da launuka kamar ruwan hoda, ja-kasa-kasa, ko launin ruwan kasa-rawaya. Takamaiman nauyi, wurin narkewa, da wurin tafasa na mahaɗin na iya bambanta saboda tasirin waɗannan ƙazanta.

Sodium sulfide yana da takardar shaidar SGS ta ɓangare na uku, takardar shaidar matakin masana'antu, kuma ya wuce takardar shaidar tsarin ingancin ƙasa da ƙasa na ISO da takardar shaidar bin ƙa'idodin REACH.