KasperCalc: MIL-PRF-23699 Density

MIL-PRF-23699 Density Chart

Measured values at ambient pressure (~83 kPa): 41 °F to 158 °F (5 °C to 70 °C).
Extended range −40 °F to 527 °F (−40 °C to 275 °C) uses a linear extrapolation with slope matched to NIST data.

Data from: NIST IR 8263 — Thermophysical Properties of Polyol Ester Lubricants, Table 23 (measured); extended range extrapolated.

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MIL-PRF-23699 Density Calculator

Degrees (°F):

Degrees (°C):

Density (kg/m³):

Density (lb/in³):

Density (lb/gal):

Density (lb/ft³):

Specific Gravity*:

Specific Gravity**:

Specific Gravity***:

°API****:

Specific Gravity is a Contentious Unit

* SG based on static density of water of 1000 (kg/m³) *

** SG based on static density of water of 998 (kg/m³) **

*** SG based on temperature dependent density of water ***

**** °API gravity at current temperature, referenced to water at 60°F (999.01 kg/m³): °API = (141.5 / SG_60°F) − 131.5 ****

Density of MIL-PRF-23699 Turbine Engine Oil

About This Data

The density data from 5 °C to 70 °C (41 °F to 158 °F) was measured by NIST using a vibrating-tube densimeter (Anton-Paar DMA 5000) at ambient pressure (~83 kPa). Each tabulated value is the average of three to six replicate measurement scans. The absolute expanded uncertainty is 1.65–1.66 kg·m⁻³ (relative: 0.12–0.18 %).

The range is extended to −40 °C (−40 °F) and 275 °C (527 °F) using a linear extrapolation with slope (−3.77 kg·m⁻³·°C⁻¹) matched to the NIST measurements. Maximum deviation from the NIST measured points within the 5–70 °C range is 0.09 kg·m⁻³, well within the measurement uncertainty. Values outside 5–70 °C should be treated as estimates only.

MIL-PRF-23699 is a fully qualified synthetic turbine engine oil based on polyol esters (POE). Its density falls between that of pure POE5 and POE7, and is very similar to pure POE7. Density decreases approximately linearly with temperature across the full range.

MIL-PRF-23699 — Density vs. Temperature

Temp (°C)	Temp (°F)	Density (kg/m³)	Density (g/cm³)	Density (lb/gal)	Density (lb/ft³)	Notes
−40	−40.0	1037.36	1.03736	8.655	64.76	Extrapolated
−35	−31.0	1033.59	1.03359	8.623	64.52	Extrapolated
−30	−22.0	1029.82	1.02982	8.592	64.29	Extrapolated
−25	−13.0	1026.05	1.02605	8.560	64.05	Extrapolated
−20	−4.0	1022.29	1.02229	8.529	63.82	Extrapolated
−15	5.0	1018.52	1.01852	8.497	63.58	Extrapolated
−10	14.0	1014.75	1.01475	8.466	63.35	Extrapolated
−5	23.0	1010.98	1.01098	8.434	63.11	Extrapolated
0	32.0	1007.21	1.00721	8.403	62.88	Extrapolated
5	41.0	1003.44	1.00344	8.371	62.64	NIST measured
10	50.0	999.67	0.99967	8.340	62.41	NIST measured
15	59.0	995.89	0.99589	8.309	62.17	NIST measured
20	68.0	992.12	0.99212	8.277	61.94	NIST measured
25	77.0	988.35	0.98835	8.246	61.71	NIST measured
30	86.0	984.58	0.98458	8.214	61.47	NIST measured
35	95.0	980.81	0.98081	8.183	61.24	NIST measured
40	104.0	977.04	0.97704	8.151	61.00	NIST measured
45	113.0	973.27	0.97327	8.120	60.77	NIST measured
50	122.0	969.50	0.96950	8.088	60.53	NIST measured
55	131.0	965.73	0.96573	8.057	60.30	NIST measured
60	140.0	961.96	0.96196	8.025	60.06	NIST measured
65	149.0	958.19	0.95819	7.994	59.83	NIST measured
70	158.0	954.42	0.95442	7.962	59.59	NIST measured
75	167.0	950.65	0.95065	7.931	59.36	Extrapolated
80	176.0	946.88	0.94688	7.900	59.12	Extrapolated
90	194.0	939.34	0.93934	7.837	58.65	Extrapolated
100	212.0	931.80	0.93180	7.774	58.18	Extrapolated
110	230.0	924.26	0.92426	7.711	57.71	Extrapolated
120	248.0	916.72	0.91672	7.648	57.24	Extrapolated
130	266.0	909.18	0.90918	7.585	56.77	Extrapolated
150	302.0	894.10	0.89410	7.459	55.83	Extrapolated
175	347.0	875.25	0.87525	7.302	54.66	Extrapolated
200	392.0	856.40	0.85640	7.145	53.48	Extrapolated
225	437.0	837.55	0.83755	6.988	52.30	Extrapolated
250	482.0	818.71	0.81871	6.831	51.13	Extrapolated
275	527.0	799.85	0.79985	6.674	49.96	Extrapolated

NIST measured values: 5–70 °C, ambient pressure (~83 kPa), NIST IR 8263 Table 23, expanded uncertainty ±1.65–1.66 kg·m⁻³. Extended range values were obtained through linear extrapolation. These values should be treated as estimates only.

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