Hexafluoropropene, oxidized, oligomers, reduced, fluorinated

Surface tension

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

other information

Study period:

May 2012 to July 2012

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods with acceptable restrictions

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

other: ASTM D971 "Standard Test Method for Interfacial Tension of Oil Against Water by the Ring Method"

Deviations:

no

GLP compliance:

no

Type of method:

ring method

Surface tension:

> 15 - < 16 mN/m

Temp.:

25 °C

Remarks on result:

other: interface tension between GALDEN LMW ad water

Measurements were performed on six different batches of Galden Low Molecular Weight at 25°C.

The obtained results are summarized in the following table:

Product name	Batch number	Interfacial tension at 25°C (dyne/cm)
GALDEN HT 55	1314SP	16
GALDEN HT 55	1631SP	15
GALDEN HT 55	1806SP	15
GALDEN HT 70	1021RR	16
GALDEN HT 70	3816OE	16
GALDEN HT 70	1531SP	16

Conclusions:

The interfacial tension between GALDEN LMW and water is in the range between 15 and 16 dyne/cm at 25°C.

Executive summary:

The purpose of the study was to determine the interfacial tension between GALDEN LMW and water, under non-equilibrium conditions.

Measurements were made in compliance with ASTM D971 method “Standard Test Method for Interfacial Tension of Oil Against Water by the Ring Method”.

According to the method, the interfacial tension was determined at the interface between oil and water, by measuring with a tensiometer the force necessary to detach a planar ring of platinum wire from the surface of the liquid of higher surface tension. The force so measured is corrected by an empirically determined factor which depends upon the force applied, the densities of both oil and water and the dimensions of the ring.

Refer to ASTM D971 method for details.

Measurements were performed on six different batches of Galden Low Molecular Weight at 25°C.

The interfacial tension was in the range between 15 and 16 dyne/cm at 25°C.

Reference 2

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

other information

Study period:

1994

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: No details on test method are given, however the data source is authoritative and reliable.

Reason / purpose for cross-reference:

reference to same study

Principles of method if other than guideline:

not reported

GLP compliance:

no

Type of method:

other: not reported

Surface tension:

14 mN/m

Temp.:

25 °C

Conc.:

100 vol%

Remarks on result:

other: Measurement conducted on the unchanged substance

Conclusions:

The surface tension of GALDEN LMW is 14 mN/m.

Executive summary:

The scope of the publication was to analyse perfluoropolyethers (PFPEs) from the point of view of their synthetic chemistry, properties, derivates, and applications. The focus of the publication is on PFPE fluids commercially named FOMBLIN and GALDEN and the information gleaned from first-hand experience are reported. FOMBLIN and GALDEN belong to the same class of PFPEs, the main difference between the two families is the molecular weight since GALDEN represents the low molecular weight fraction of FOMBLIN. Both of FOMBLIN and GALDEN are fluids at standard conditions.

In the publication the chemical and physical properties of several commercial products of the GALDEN family are reported. GALDEN LMW, which itself represents the low molecular weight fraction of the GALDEN family is also described with the commercial name of GALDEN HT 70.

The surface tension of GALDEN LMW, experimentally determined on the substance itself, is reported to be 14 mN/m.

Reference 3

Endpoint:

surface tension

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because based on structure, surface activity is not expected or cannot be predicted

the study does not need to be conducted because surface activity is not a desired property of the material

the study does not need to be conducted because water solubility is below 1 mg/L at 20°C

Description of key information

GALDEN LMW is not expected to have surface activity properties.
The surface tension of GALDEN LMW itself is 14 mN/m.
The interfacial tension between GALDEN LMW and water is in the range between 15 and 16 mN/m.

Additional information

In accordance with Column 2 of REACH Annex VII, information requirement section 7.6, the study does not need to be conducted if surface activity is not expected or surface activity is not a desired property of the material.

According to REACH guideline Chapter R.7a and to the advised international test guidelines the surface tension is measured on aqueous solutions of the test item in order to determine the potential surface activity properties.

GALDEN LMW is not expected to have surface activity, therefore conducting an experimental study according to the advised test guidelines in order to determine the surface activity properties is unjustified.

However a value of surface tension for the substance itself and a measurement of the interfacial tension between GALDEN LMW and water are reported.

The value of surface tension for GALDEN LMW derives from a reliable scientific publication. In the publication, some chemical and physical properties of GALDEN LMW are described. The surface tension of GALDEN LMW, experimentally determined, is reported to be 14 mN/m.

The interfacial tension between GALDEN LMW and water under non-equilibrium conditions, was experimentally determined according to ASTM method No. D971 “Standard Test Method for Interfacial Tension of Oil Against Water by the Ring Method” on six defferent batches of GALDEN LMW. The interfacial tension is determined to be in the range between 15 and 16 mN/m at 25°C.