ASGAS 100LL: An Introduction

ASGAS 100LL is a type of aviation fuel commonly used in piston-engine aircraft. The fuel is a combination of 100 octane low-lead (LL) gasoline and a small amount of tetraethyl lead. This blend provides excellent performance for high-performance aircraft while also reducing the risk of engine damage.

Availability of ASGAS 100LL in Different Sizes

ASGAS 100LL is available in two sizes: 200-liter metal drums and 24,000-liter ISO tanks. The metal drums are convenient for smaller operations or those with limited storage space, while the ISO tanks are suitable for larger airports and aircraft fleets.

Handling and Storage of ASGAS 100LL: Importance and Procedures

It is essential to handle ASGAS 100LL with care and follow proper storage and handling procedures to ensure its quality and safety. Additionally, it is crucial to use the correct type of fuel for each aircraft to prevent engine damage or failure.

SAMPLE ID: TK 2073-T-0018

Sample Date: 06.03.2023

Report Date: 07.03.2023

Test Category Test-A

Sample Source: TK 2073-T-001B (Tank UML Composite)

Report No: AVGAS 100LL/12/2023

Batch No: AVGAS 100LL/IOC/RK/2073T001B/002

Sample Collected by: JR QC

Reason for Testing: Certification as per DEF STAN 91-080 issue 5, 14 December 2019

DEF STAN 91-080 issue 5, 14 December 2019 Table 1- Test Requirements

TestPropertyuomLimits Grade 100LLTest Methods  JR-QC Results
1AppearanceClear, bight and visually free from solid mater and undissolved water at ambient temperatureVisualClear, bight and visually free from solid matter and undissolved water at ambient temperature  
2Colour, visual (see NOTE 1) BlueVisualBlue
3Corrosion Copper Strip Max 1ASTM D1301a  
4Density at 15°Ckg/m3ReportASTM D4052693.6
5Total Sulphur, Max% m/mMax 0.05ASTM D54530.0003  
6Existent Gummg/100 mlMax 30ASTM D381<1
7Freezing PointºCMax minus 58ASTM D2386 (see NOTE 2)  <-58  
8Specific EnergyMJ/kgMin 43.5ASTM D333844.4
9Reid Vapour Pressure at 37.8°C*kPaMin 38.0 Max 49.0ATSM D519145.2  
10Knock Rating    
10.1Lean Mixture Motor Method Octane Min 99.6ASTM D2700 (see NOTE 3)101.8  
10.3Performance Number** Min 130.0ASTM D909 (see NOTE 3)135.2  
11Distillation  ASTM D86 Group 2   
11.1Initial Boding PointºCReport 37
11.2Temperature at % fuel evaporated    
11.2.110 vol %ºCMax 75 63
11.2.240 vol %ºCMin 75 97
11.2.350 vol %ºCMax 105 103
11.2.490 vol %ºCMax 135 113
11.3Final Boiling PointºCMax 170 142
11.4Sum of 10% and 50% Evaporated TemperaturesºCMin 135 166
11.5Residue% v/vMax 1.5 1.2
11.6Loss% v/vMax 1.5 1
12Oxidation Stability, 16 hours  ASTM D873   
12.1Potential Gummg/100miMax 6 1
12.2Precipitatemg/100miMax 2 0.00
13Tetraethyl Lead ContentgPb/lMin 0.28-Max 0.56ASTM D5059 (See NOTE 6)0.54
14Water Reaction      
14.1Volume ChangemlMax 2ASTM D10940.0
15Electrical Conductivity***pS/m50-600ASTM D2624 (See NOTE 7)15
16Colour, Lovibond  IP 17 (see NOTE 8)   
16.1Blue Min 1.7-Max 3.5 2.9

DEF STAN 91-090 Issue 5 Notes

NOTE 1: The visual colour must also comply with test 16 of this table.

Note 2: If no crystals appear when the thermometer indicates a temperature of – 58ºC, the freezing point shall be recorded as below -58ºC.

Note 3: Knock rating shall be reported to the nearest 0.1 for Octane Number and Performance Number.

Note 6: For Grade UL91 ASTM D3237 is applicable For Grades 100LL and 100/130 IP270 is applicable.

Note 7: When a Static Dissipator Additive has been added to the fuel the conductivity at the point, time and temperature of delivery to the purchaser shall be in the range 50 10 600 pS/m.

Note 8: IP 17 has been replaced by IP 569, A50.8mm cell shall be used, IP 17 is allowed as an alternative method, see Table 3.