CTSO-2C707 民用航空燃料抗氧剂、抗静电剂、抗磨剂及防冰剂

日期：2022 年 5 月 27 日局长授权

批准：

中国民用航空技术标准规定

本技术标准规定根据中国民用航空规章《民用航空材料、零部件和机载设备技术标准规定》（CCAR37）颁发。中国民用航空技术标准规定是对用于民用航空器上的某些航空材料、零部件和机载设备接受适航审查时，必须遵守的准则。

民用航空燃料抗氧剂、抗静电剂、抗磨剂及防冰剂

1. 目的

本技术标准规定（CTSO）适用于为民用航空燃料抗氧剂、抗静电剂、抗磨剂及防冰剂等添加剂申请技术标准规定项目批准书（CTSOA）的制造人。本 CTSO 规定了民用航空燃料抗氧剂、抗静电剂、抗磨剂及防冰剂等添加剂为获得批准和使用适用的 CTSO 标记进行标识所必须满足的最低性能标准。

2. 适用范围

本 CTSO 适用于自其生效之日起提交的申请。按本 CTSO 批准的民用航空燃料抗氧剂、抗静电剂、抗磨剂及防冰剂等添加剂，其设计大改应按 CCAR-21 要求重新申请 CTSOA。

3. 要求

a. 性能要求

（1）抗氧剂

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CAAC CTSO-2C707

（i）2,6-二叔丁基对甲基苯酚

应满足《501 抗氧剂》（SH/T 0015）的要求，具体技术要求见表 1。

表 1 2,6-二叔丁基对甲基苯酚技术要求

项目

质量指标

试验方法

一级品

合格品

外观

白色结晶

目测

初熔点，℃

69.0~70.0

68.5~70.0

GB/T 617

游离甲酚，%（质量分数） 不大于

0.015

0.03

SH/T 0015 附录 A

灰分，%（质量分数） 不大于

0.01

GB/T 508

水分，%（质量分数） 不大于

0.05

0.08

GB/T 606a)

闪点（闭口），℃

报告

—

GB/T 261

a) 测定水分时，改为取 3~4 mL 溶液甲，以溶液乙滴定至终点，不记录读数，然后迅速

加入试样 1 g，称准至 0.01 g，在搅拌下使之溶解，再用溶液乙滴定至终点。

（ii）新抗氧剂

新抗氧剂指未列入GB 6537-2018的抗氧剂。抗氧剂应有明确的化学成分及含量范围，并在其技术规范中规定物理化学性能和指标范围。

按照 ASTM D4054-20c A2.4.5.1 的要求，在空白 3 号喷气燃料（见表 2）中分别加入新抗氧剂和2,6-二叔丁基对甲基苯酚，对比测试燃料的氢过氧化物数值（Hydroperoxide number）、酸值和非溶解性胶质。新抗氧剂减缓燃料氧化速度的能力不应低于 2,6-二叔丁基对甲基苯酚，详见表2。

（2）抗静电剂

（i）T1502和Stadis 450

T1502 应满足《T1502 抗静电剂规范》（YLB 21）的要求，具体

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技术要求见表 3。Stadis 450 已列入 GB 6537、ASTM D1655 和 Def Stan 91-091 等国内国际航空喷气燃料通行标准中，同时也列入了飞机和发动机数据单中，不再对其设计、生产进行批准，其储存、运输、加注应满足《民用航空油料适航管理规定》（CCAR-55）的要求。

表 2 抗氧剂性能评判标准

测试项目

评判标准

氢过氧化物数值，mg/kg

（试验样 a)-空白样b)）≤（对照样 c)-空白样）

ASTM D3703

酸值，mg KOH/g

ASTM D3242、GB/T 12574

非溶解性胶质，mg/100 mL

ASTM D5304

a) 试验样：空白样+新抗氧剂；

b) 空白样：空白 3 号喷气燃料可以是未加添加剂的 3 号喷气燃料，且水分离指数不低于 98；也可是经白土过滤处理后的 3 号喷气燃料，且电导率小于 5 pS/m，水分离指数不低于 98；

c) 对照样：空白样+2,6-二叔丁基对甲基苯酚。

表 3 T1502 抗静电剂技术要求

琥珀色透明液体

密度 20℃, kg/m3

880-910

GB/T 1884

灰分，%（质量分数） 不大于

0.10

红外光谱分析

符合 YLB 21 附录 A 中红外光谱图

YLB 21 附录 A

加速贮存试验

通过

YLB 21 附录B

水分离指数 a) 不小于

80

SH/T 0616

电导率 b) 20 ℃, pS/m 不小于

200

GB/T 6539

a) 条件：喷气燃料馏分的水分离指数大于 95，加入 T1502 抗静电剂后，电导率在 200 pS/m~350 pS/m；

b) 条件：1 L 喷气燃料馏分中含 2 mg T1502 抗静电剂。

（ii）新抗静电剂

新抗静电剂指未列入GB 6537-2018的抗静电剂。新抗静电剂应有明确的化学成分及含量范围，并在其技术规范中规定物理化学性能和

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指标范围。

在空白 3 号喷气燃料中加入新抗静电剂，当电导率达到 150 pS/m （20 ℃)时，加剂浓度不应大于 3 mg/L；当加剂浓度累计达到 3 mg/L时，水分离指数不应低于 70。空白 3 号喷气燃料可以是未加添加剂（可加抗氧剂）的 3 号喷气燃料，且水分离指数不低于 98；也可是经白土过滤处理后的 3 号喷气燃料，且电导率小于 5 pS/m，水分离指数不低于 98。

按照 ASTM D4054-20c A2.4.5.3 开新添加剂性能评价。新抗静电剂提升燃料导电性能及其保持能力不应低于 T1502 或 Stadis 450，静电消散能力应大于静电聚集能力。

（3）抗磨剂

（i）T1602

应满足《T1602 喷气燃料抗磨添加剂》（SH/T 0766）的要求，具体技术要求见表 4。

（ii）新抗磨剂

新抗磨剂指未列入GB 6537-2018的抗磨剂。新抗磨剂应有明确的化学成分及含量范围，并在其技术规范中规定物理化学性能和指标范围。

按照 ASTM D5001 或 SH/T 0687，使用沸程为 225℃~254℃的异构烷烃作为溶剂，测试最低有效浓度（磨痕直径小于等于 0.65 mm 的最小加剂量），其最低有效浓度不应大于 20 mg/L。同时，按照 ASTM D4054-20c A2.4.5.4，验证新抗磨剂其他性能。

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表 4 T1602 抗磨剂技术要求

环烷酸含量，%（质量分数） 不小于

85

SH/T 0092

纯酸值，mg KOH/g 不小于

220

水分，%（体积分数） 不大于

1.0

GB/T 260

铁-钴比色，号不大于

14

GB/T 1722

馏程，℃

GB/T 6536

初馏点不低于

160

90%回收温度不高于

335

GB/T 1884、GB/T 1885

效能指数不小于

240

SH/T 0766 附录 A

（4）防冰剂

（i）二乙二醇甲醚

应满足《燃油系统防冰剂》（ASTM D4171）的要求，具体技术要求见表 5。

表 5 防冰剂二乙二醇甲醚技术要求

酸值，mg KOH/g 不大于

0.09

ASTM D1613

颜色，铂-钴不大于

10

ASTM D1209

纯度，%（质量分数） 不低于

99.0

ASTM D4171 附录 A1

25%水溶液（25±2 ℃) pH

5.5~7.5

ASTM E70a)

相对密度，20℃/20℃

1.020~1.025

SH/T 0604、ASTM D4052

水分，%（质量分数）

ASTM D1364

制造时不大于

使用时不大于

0.8

闪点，℃ 不低于

GB/T 261、GB/T 21929、ASTM D93、ASTM D56、ASTM D3828

抗氧剂，mg/kg

50~150

b)

a) 移取25mL 防冰剂至 100mL 烧杯中，使用新鲜煮沸并冷却的去离子水（pH 在 6.5~7.5）稀释，按照 ASTM E70，使用 pH 计测试 pH；

b) 使用的抗氧剂需通过局方的批准。

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（ii）新防冰剂

新防冰剂剂指未列入GB 6537-2018的防冰剂。新防冰剂应有明确的化学成分及含量范围，并在其技术规范中规定物理化学性能和指标范围。

新防冰剂应能降低燃料的冰点，改善燃料低温流动性，且降低燃料冰点的能力应不低于二乙二醇甲醚。

b. 其他要求

添加剂的所有化学成分和最终产品应符合国家关于环保、毒理和安全等方面的相关法律、法规的要求。

添加剂在改善燃料特定性能的同时，还应满足 ASTM D4054 中部分要求，包括燃料规格、化学组成、理化性能、电性能、地面操作性能、安全性能、与已批准添加剂相容性及与飞机发动机金属材料和非金属材料相容性等。新添加剂还应进行部件试验、发动机试验及飞行试验。

c. 检验机构

所有的试验均在局方认可的检验机构或在局方的监督下进行。

d. 偏离

如果采用替代或等效的符合性方法来满足本 CTSO 规定的最低性能标准要求，则申请人必须表明产品保持了等效的安全水平。申请人应按照 CCAR-21 第 21.368 条（一）要求申请偏离。

4. 标记

添加剂产品质量合格证及其他相关文件至少应标注以下内容，但

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不限于：

a. 产品名称/牌号和标准；

b. 局方批准的CTSOA证件号对应的CTSO标准号；

c. 生产单位的名称和地址；

d. 生产日期、生产数量和批次号。

5. 资料要求

申请人应提交相关技术资料以支持设计和生产批准，包括：

a. CCAR-21中有关申请CTSOA的资料；

b. 相关标准或规范；

c. 原料情况说明；

d. 生产工艺技术资料；

e. 产品的化学品安全技术说明书；

f. 局方要求的其他材料。

6. 应用说明

申请人取得 CTSOA 后，还应获得装机批准。若添加剂牌号已随燃料列入了航空器和发动机的型号合格数据单（TCDS）、补充型号合格证（STC）或其他型号设计批准文件，可直接使用，不再进行装机批准。

7. 引用文件

a. GB标准可以从下列地址购买：中国标准出版社，北京复兴门

外三里河北街16号，010-68523946；

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b. SH标准可以从下列地址购买：中国石化出版社，北京市东城区安定门外大街58号，010-84271850；

c. YLB标准可以从下列地址购买：中国航空综合技术研究所，北京市朝阳区京顺路7号，010-84387036；

d. ASTM标准可以从下列地址购买：ASTM, 100 Barr Harbor Drive, West Conshohocken PA 19428-2959。

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Number: CTSO-2C707

Date of approval: May 27, 2022

Approved by: Yang Zhenmei

China Civil Aviation Technical Standard Order

This China Civil Aviation Technical Standard Order (CTSO) is issued according to Part 37 of the China Civil Aviation Regulations (CCAR-37). Each CTSO is a criterion which the concerned aeronautical materials, parts or appliances used on civil aircraft must comply with when it is presented for airworthiness certification.

Antioxidant, Static Dissipator Additive, Anti-wear Additive and Icing

Inhibitor of Civil Aviation Fuel

1. Purpose

This China Civil Aviation Technical Standard Order (CTSO) is for manufacturers applying for CTSO Authorization(CTSOA) of antioxidant, static dissipator additive, anti-wear additive and icing inhibitor of civil aviation fuel. This CTSO prescribes the minimum performance standards that additive must first meet for approval and identification with the applicable CTSO marking.

2. Applicability

This CTSO is applicable for new applications since CTSO goes into effect. Major design changes to the antioxidant, static dissipator additive, anti-wear additive and icing inhibitor of civil aviation fuel approved under this CTSO shall require a new authorization in accordance with CCAR-21.

3. Requirements

a. Performance requirements

(1) Antioxidant

(i) 2,6-ditertiary-butyl-4-methyl phenol

It shall meet the requirements of 501 Antioxidant (SH/T 0015). Detailed technical requirements list in table 1.

Table 1 Technical Requirements for 2,6-ditertiary-butyl-4-methyl phenol

Property

Limits

Test Method

Premium

Product

Qualified

Appearance

White crystal

Visual

Initial melting point, ℃

Free cresol, mass% Max

SH/T 0015 Annex A

Ash content, mass% Max

Water, mass% Max

Flash point (closed cup), °C

Report

a) For the determination of water, titrate 3~4 mL of solution A to the end point with solution B, no record, promptly add 1 g of sample (weighed to the nearest 0.01 g) and agitate to make the sample dissolve, titrate it with solution B to the end point.

(ii) New antioxidant

New antioxidant which not list in GB 6537-2018 shall specify chemical composition, content, physical and chemical properties limits.

New antioxidant and 2,6-ditertiary-butyl-4 methyl phenol shall be added to blank No. 3 jet fuel (see Table 2) respectively to compare the hydroperoxide number, acid value and insoluble gums according to the requirements of A2.4.5.1 of ASTM D4054-20c. The ability of the new

antioxidant to reduce the fuel oxidation rate shall not be less than 2,6- ditertiary-butyl-4-methyl phenol, see Table 2 for details.

Table 2 Antioxidant Performance Evaluation Criteria

Criteria

Hydroperoxide number, mg/kg

(Test Samplea)-Blank Sampleb)) ≤ (Control Samplec)-Blank Sample)

Acid value, mg KOH/g

ASTM D3242

GB/T 12574

Insoluble gums, mg/100 mL

a) Test sample: Blank sample + new antioxidant;

b) Blank sample: The blank of No. 3 jet fuel could be either the one with no additive and the microseparometer not less than 98, or the one subject to clay-filtering with the conductivity less than 5 pS/m and the microseparometer not less than 98.

c) Control sample: Blank sample + 2,6-ditertiary-butyl-4-methyl phenol.

(2) Static dissipator additive

(i) T1502 and Stadis 450

T1502 shall meet the requirements of T1502 Static Dissipator Additive Specification (YLB 21). Detailed technical requirements list in table 3. Stadis 450 has been included in GB 6537, ASTM D1655, Def Stan 91-091 and other current Chinese and international aviation jet fuel standards as well as aircraft and engine Type Certificate Data Sheets, its design and manufacture are not essential to obtain approval. For storage， transportation and into-plane fuel services, it shall meet the requirements of Airworthiness Management for Civil Aviation fuel/Oil Suppliers and Laboratories (CCAR-55).

Table 3 Technical Requirements for T1502 Static Dissipator Additive

Clear amble liquid

Density(20°C), kg/m3

Ash content, mass% Max

Infrared spectroscopy

In line with the infrared spectrum in YLB 21

YLB 21 Annex A

Accelerated storage test

Pass

YLB 21 Annex B

Microseparometera) Min

Electrical conductivity (20℃), pS/m Min

a) Condition: The microseparometer of jet fuel distillate shall be over 95. Electrical conductivity shall be 200 pS/m ~ 350 pS/m after T1502 static dissipator additive added.

b) Condition: 1 L jet fuel distillate contains 2 mg ofT1502 static dissipator additive.

(ii) New static dissipator additive

New static dissipator additive which not list in GB 6537-2018 shall specify chemical composition, content, physical and chemical properties limits.

The concentration shall not be over 3 mg/L when the electrical conductivity reaches 150 pS/m (20 ℃) by adding the new static dissipator additive to a blank No. 3 jet fuel; when the cumulative concentration of the new static dissipator additive reaches 3 mg/L, the microseparometer shall not be less than 70. Blank No. 3 jet fuel could be either the fuel with no additive(except antioxidant) and the microseparometer not less than 98, or the fuel subjected to clay-filtering with the conductivity less than 5 pS/m and the microseparometer not less than 98.

According to ASTM D4054-20c Section A2.4.5.3, improving and retaining electrical conducting performance of new static dissipator additive shall not be less than T1502 or Stadis 450, static dissipation ability shall be greater than charging ability.

(3) Anti-wear additive

(i) T1602

It shall meet the requirements of T1602 Antiwear Additive for Jet Fuels (SH/T 0766). Detailed technical requirements list in table 4.

Table 4 Technical Requirements for T1602 Anti-wear Additive

Naphthenic acid content, mass% Min

Pure acid value, mg KOH/g Min

Water, vol % Max

Iron-cobalt colorimetric, number Max

Distillation range,

Initial boiling point Min

90% recovered Max

Density (20°C), kg/m3

GB/T 1884 and GB/T 1885

Efficiency index Min

SH/T 0766 Annex A

(ii) New anti-wear additive

New anti-wear additive which not list in GB 6537-2018 shall specify chemical composition, content, physical and chemical properties limits.

According to ASTM D5001 or SH/T 0687, use iso-paraffin that has a boiling range of 225 ℃ ~254 ℃ to determine the minimum effective concentration, i.e. the minimum dose at which the wear scar diameter is

smaller than orthe same as 0.65 mm. The minimum effective concentration shall not be over 20 mg/L. Other performances of the new anti-wear additive shall be verified in accordance with ASTM D4054-20c section A2.4.5.4.

(4) Icing inhibitor

(i) Diethylene glycol monomethyl ether

It shall meet the requirements of Standard Specification for Fuel System Icing Inhibitors (ASTM D4171). Detailed technical requirements list in table 5.

(ii) New icing inhibitor

New icing inhibitor which not list in GB 6537-2018 shall specify chemical composition, content, physical and chemical properties limits.

The new icing inhibitor shall be able to reduce the freezing point of fuel and improve the low temperature fluidity of fuel. The reduction of fuel freezing point ability shall not be less than diethylene glycol monomethyl ether.

b. Other requirements

All the chemical components and final products of the additive shall comply with the national laws and regulations on environmental protection, toxicology and safety.

Besides the improvement of specific fuel performance, the additive shall meet some of requirements in ASTM D4054, including fuel

specification, chemical composition, physical and chemical properties, electrical properties, ground operation performance, safety performance, compatibility with other approved additives and metallic/non-metallic materials of aircraft engine. New additive shall also be subject to rig test, engine test and flight test.

Table 5 Technical Requirements for Icing Inhibitor Diethylene Glycol

Monomethyl Ether

Acid number, mg KOH/g Max

Color, platinum-cobalt Max

Purity, mass% Min

ASTM D4171 Annex A1

pH of 25% solution in water(25±2℃)

Relative density, 20℃/20℃

SH/T 0604 and ASTM D4052

Water, mass%

Point of manufacture Max

Point of use Max

Flash point, °C Min

GB/T 261, GB/T 21929, ASTM D93, ASTM D56 and ASTM D3828

Antioxidant, mg/kg

a) Pipette 25 mL of the inhibitor into a 100 mL volumetric flask and filled with freshly boiled and cooled distilled water having a pH of 6.5 to 7.5. Measure the pH value with a pH meter calibrated in accordance with Test Method E70.0.

b) The antioxidant shall be approved by CAAC.

c. Testing laboratory

All tests shall be conducted in laboratories approved by CAAC or under the supervision ofCAAC.

d. Deviations

For using alternate or equivalent means of compliance to the criteria

in this CTSO, the applicant must show that the product maintains an equivalent level of safety. The applicant must apply for a deviation under the provision of section 21.368(一) in CCAR-21.

4. Marking

The quality certificate and other applicable documents of additive shall mark at least the following information:

a. Product designation/grade and standards;

b. CTSO and CTSOA number;

c. Manufacturer designation and address;

d. Manufacture date, quantity and batch number.

5. Documents Requirements

The applicant shall submit the responsible documents as follows：

a. Documents for CTSOA application according to CCAR-21;

b. Related standards or specifications;

c. Description of feedstock;

d. Documents of production process and technology;

e. Safety data sheet for chemical products (SDS);

f. Other documents required by CAAC.

6. Application Note

After obtaining CTSOA, the applicant shall obtain aircraft installation approval. If additive grade has already listed in the type certificate data

sheets (TCDS), supplemental type certificate (STC) or other design approval documents, civil aviation jet fuel is not essential for installation approval.

7. Referenced Documents

a. GB standards are available from:

Standard Press of China, No. 16, North Sanlihe Street, Fuxingmenwai, Beijing. Tel: 010-68523946.

b. SH standards are available from:

China Petrochemical Press Co., Ltd., No. 58, Andingmenwai Street, Dongcheng District, Beijing. Tel: 010-84271850.

c. YLB standards are available from:

AVIC China Aero-polytechnology Establishment, No. 7, Jingshun Road, Chaoyang District, Beijing. Tel: 010-84387036.

d. ASTM standards are available from:

ASTM, 100 Barr Harbor Drive, West Conshohocken PA 19428-2959.

(The English version is for reference only. In case of any discrepancy or ambiguity of meaning between this English translation and the Chinese version, the latter shall prevail.)

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