Hydroxypropyl Methyl Cellulose (HPMC) bụ ihe mgbakwunye dị iche iche a na-ejikarị eme ihe n'ọtụtụ ụlọ ọrụ mmepụta ihe, gụnyere nhazi ink. Njirimara pụrụ iche ya na-eme ka arụmọrụ, ịdị mma, na arụmọrụ nke ink dịkwuo mma nke ukwuu. Isiokwu a na-enyocha uru nke iji HPMC na nhazi ink, na-egosipụta mmetụta ya na njikwa viscosity, nkwụsi ike, na ịdị mma mbipụta.