Mod 6 - Viscosity

Module from the Laboratory Analyst Training Curriculum curriculum.

Module 6 — Viscosity Measurement · Learning Objectives · 1. Differentiate kinematic and dynamic viscosity and their uses. · 2. Run D445 kinematic viscosity test with the correct capillary tube. · 3. Operate D2983 Brookfield rotational viscometer for low-temperature lubes. · 4. Apply temperature corrections and VI calculation per D2270. · 5. Manage viscometer calibration using certified reference fluids. · Viscosity Methods

Method	Type	Application
ASTM D445	Kinematic (capillary)	Fuels, lubes, distillates
ASTM D446	Capillary Tube Spec	Glassware referenced by D445
ASTM D2983	Brookfield Low-Temp	Gear oil, ATF at sub-freezing
ASTM D7042	Stabinger	Kinematic + density together
ASTM D2270	Viscosity Index (VI)	Base oil / lube
ASTM D4684	MRV Pumpability	Engine oil at low temp
ASTM D5293	CCS Cold Cranking Simulator	SAE engine oil low temp
D445 Kinematic Procedure
Parameter	Value
Bath temperature control	± 0.02 °C for routine
Common test temps	104 °F (40 °C), 212 °F (100 °C)
Flow time minimum	200 s per pass
Flow time duplicate agreement	<0.35% determinability
Timing	Automatic or stopwatch ±0.1 s
Tube selection	Flow time 200–1000 s target
D445 Representative Tube Sizes
Tube Type	Size #	Viscosity Range (cSt)
Cannon-Fenske	25	0.5–2
Cannon-Fenske	50	0.8–4
Cannon-Fenske	100	3–15
Cannon-Fenske	200	20–100
Cannon-Fenske	350	100–500
Cannon-Fenske	450	240–1200
Ubbelohde	1B	2–10
Ubbelohde	3	20–100
Typical Product Viscosities
Product	Temp	Typical Range
Jet A	-4 °F	<8.0 cSt (max)
ULSD	104 °F	1.9–4.1 cSt
No. 6 Fuel Oil	122 °F	50–300 cSt
SAE 30	212 °F	9.3–12.5 cSt
SAE 10W-40	212 °F	12.5–16.3 cSt
Hydraulic AW 46	104 °F	41.4–50.6 cSt
Gas oil (heating)	104 °F	2.0–4.3 cSt
Viscosity Index Calculation (D2270)
Step	Description
1	Measure KV at 104 °F (40 °C)
2	Measure KV at 212 °F (100 °C)
3	Look up L and H from D2270 table at 212 °F KV
4	VI = (L - U)/(L - H) × 100, where U = KV at 104 °F
5	For VI > 100, use extended formula in D2270 §6.2
Calibration & QC
Item	Requirement
Viscosity calibration fluids	Cannon or equivalent, NIST-traceable
Verification frequency	Monthly or after tube change
Bath thermometer	NIST-calibrated, ±0.02 °F
Control charts	X-bar / R on 2 check fluids
Tube cleaning	Chromic acid or detergent + rinse
◄ Return to Instructions

Source: Laboratory_Analyst_Training_Curriculum_v1.xlsx · Sheet: Mod 6 - Viscosity

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