The invention pertains to certain hydro-fluorocompounds of the following formula (I): R
f
O—R
H
—O—(CH2)
m
-[CF(X)
n
]—COOX
a
wherein: —X
a
is H, a monovalent metal (preferably an alkaline metal) or an ammonium group of formula —N(R′
n
)
4
, wherein each of R′
n
, equal to or different from each other, independently represents a hydrogen atom or a C
1-6
hydrocarbon group (preferably an alkyl group); —R
f
is a C
1
-C
6
(per)fluoroalkyl optionally comprising one or more catenary oxygen atoms, preferably R
f
is a group of formula R
f
—CH
2
—, wherein R′
f
is a C
1
-C
5
perfluorinated group, possibly comprising one or more ethereal oxygens, preferably a C
1
-C
3
perfluorinated group, possibly comprising one or more ethereal oxygens; —R
H
is a fluorine-free hydrocarbon group optionally comprising one or more catenary oxygen atoms; —X is F or CF
3
, preferably X is F; -m is 0 or 1; -n is 1 to 3, to a process for the manufacture of said hydro-fluorocompounds, to a method of making fluoropolymers in the presence of said hydro-fluorocompounds, and to fluoropolymer dispersions comprising said hydro-fluorocompound.