Phosphoric acid, mono- and bis(branched and linear pentyl) esters

Storage stability and reactivity towards container material

Administrative data

Endpoint:

storage stability and reactivity towards container material

Type of information:

experimental study

Adequacy of study:

key study

Study period:

december 2013- january 2014

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: guideline followed and good quality of results reported

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2014

Report date:

2014

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: UN Classification Procedure, Test Methods and Criteria Relating to Substances of Class 8, Test C.1

GLP compliance:

not specified

Type of method:

accelerated testing

Test material

Test material information

Constituent 1

Reference substance name:

Phosphoric acid, mono- and bis(branched and linear pentyl) esters

EC Number:

282-784-6

EC Name:

Phosphoric acid, mono- and bis(branched and linear pentyl) esters

Cas Number:

84418-71-3

Molecular formula:

UVCB substance

IUPAC Name:

Phosphoric acid, mono- and bis(branched and linear pentyl) esters

Specific details on test material used for the study:

Approximately 1 litre of Rhodafac AAP XLP was charged to a 2 litre jacketed glass vessel fitted with reflux condenser and heated using an external Haake oil heater/circulator. Three pre-weighed test coupons were suspended by PTFE tape such that one was fully immersed in the liquid, one half-immersed and the other suspended in the vapour space above the liquid surface. Separate tests were run for aluminium and steel coupons. The vessel was heated at 55°C for 7 days. The coupons were removed from the vessel and washed in acetone. All loose deposits were removed with a plastic brush and the coupons were rinsed again with acetone, dried and re-weighed.

Results and discussion

Results:

The weight losses recorded for the fully immersed coupons were equivalent to maximum corrosion rates of:
+0.83 mm/year for steel
+0.30 mm/year for aluminium.

During the tests the immersed surfaces of both metals became coated with a black film. This was more noticeable on the steel coupons. The film could be washed off in acetone.
No effervescence was seen at the immersed surfaces.
None of the coupons showed any visible evidence of localized corrosion such as pitting or blistering.
There was no visible evidence of accelerated corrosion to the half immersed coupons at the air/liquid interface.
Metal surfaces that were exposed only to the vapour space were not corroded at all.

Transformation products:

not specified

Any other information on results incl. tables

Aluminium 7075-T6 (50 x 25 x 1.6mm)
Coupon	#213 Fully immersed	#212 Half immersed	#211 Vapour space
Appearance after 7 days	Lightly coated with black film which washed off leaving surface whiteish & dull.	Immersed half as #213. Vapour space halfbright & shiny, pristine condition.	Very slight localized dull staining. Otherwise bright & shiny.
Initial weight (g) Final weight (g) Weight loss (mg) Weight loss (%)	5.5331 5.4896 43.5 0.79	5.5330 5.5145 18.5 0.33	5.5276 5.5278 -0.2 -0.004
Corrosion rate (mils/year) Corrosion rate (µ/year) Corrosion rate (mm/year)	11.7 296.1 0.30	5.0 125.9 0.13	-0.1 -1.4 0.00
Steel S275J2G3 (50 x 25 x 3mm)
Coupon	#33 Fully immersed	#32 Half immersed	#31 Vapour space
Appearance after 7 days	Coated with black film which washed off leaving surface dark grey & dull.	Immersed half as #33. Vapour space half as #31	Bright & shiny, pristine condition
Initial weight (g) Final weight (g) Weight loss (mg) Weight loss (%)	29.0907 28.7213 369.4 1.27	29.0301 28.7900 240.1 0.83	29.1317 29.1318 -0.1 0.000
Corrosion rate (mils/year) Corrosion rate (µ/year) Corrosion rate (mm/year)	32.7 829.6 0.83	21.2 539.2 0.54	0.0 -0.2 0.00

Applicant's summary and conclusion

Conclusions:

Based on the experimental results, the substance was considered to be non corrosive to metal

Executive summary:

Coupons of metal (aluminium and steel) were exposed to Rhodaphac AAP in diferents conditions (fully immersed, half immersed and suspended in the vapour space) following the UN classification procedure, test methods and criteria relating to substances of class 8, Test C1. The experimental vessel was heated at 55°C for 7 day.

In this condition, the fully immersed coupons were equivalent to maximum corrosion rates of

+ 0.83 mm/year for steel

+ 0.30 mm/year for aluminium