Browse Topic: Fluoride

Items (544)

Performance Specification Anti-Seize Thread Compound, High Temperature - ‘Graphite+Calcium Fluoride’ Only

12/4/2024

The foundation specification (AMS3050) and this category specification (AMS3050/9) cover anti-seize greases conforming to the requirements, but using the anti-seize ingredient Graphite+Calcium Fluoride only.

AMS M Aerospace Greases Committee

Easy, Accurate, Low-Cost Detection of Fluoride in Water

TBMG-49227

10/1/2023

Researchers from Northwestern University have collaborated on the implementation of an accurate, low-cost, and easy-to-use test for detecting toxic levels of fluoride in water. The new biosensor device has been field tested in Kenya — proving that testing water for fluoride can be easily accomplished outside of a lab and accurately interpreted by nonexperts.

Magnesium Alloy, Processes for Pretreatment and Prevention of Corrosion on

AMSM3171A (Current)

9/14/2022

This specification covers general requirements for the apparatus, material, and procedures to be used in the processing of magnesium base alloys for the purpose of increasing their corrosion resistance and by producing surfaces suitable for organic paint finish systems.

AMS B Finishes Processes and Fluids Committee

Impact of Biodiesel, Renewable Diesel, 1-Octanol, Dibutoxymethane, n-Undecane, Hexyl hexanoate and 2-Nonanone with Infrastructure Plastics as Blends with Diesel

2022-01-0487

3/29/2022

In this study the volume and hardness were measured for thermoplastics and thermosetting resins with diesel containing up to 30% of the following blend stocks: biodiesel, renewable diesel, n-undecane, dibutoxymethane, 1-octanol, hexyl hexanoate, and 2-nonanone. Thermoplastics included polyphenylene sulfide (PPS), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyoxymethylene (POM), polybutylene terephthalate (PBT), polypropylene (PP), high density polyethylene (HDPE), nylons, acetals, polyetherimide (PEI), polyetheretherketone (PEEK), a PET co-polymer, polyphthalamides (PPAs), polyarylamide (PARA) and ethylene tetrafluoroethylene (ETFE). Three thermosetting resins were also evaluated. The material specimens were exposed to the test fuels under ambient conditions for 16 weeks. In general, the volume and hardness of the specimens were relatively unaffected following exposure to the test fuels; however, n-undecane produced significant swelling in polypropylene and may not be suitable for use with this material. N-undecane, along with hexyl hexanoate and 2-nonanone also caused low levels of swelling in nylon, which was not significant enough to preclude the use of nylons in sealing applications with these fuels.

Kass, Michael, Janke, Chris, Nafziger, Eric

FITTING, TEE, BULKHEAD, FLARELESS ON THE SIDE, EXTERNAL SWAGE ON THE RUN, STANDARD AND REDUCER, HYDRAULIC, 3000 PSI

AS6482 (Current)

9/1/2021

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, TEE, INTERNAL STRAIGHT THREAD PORT

AS5192F (Current)

8/26/2021

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, ELBOW 45°, BULKHEAD SEALING, EXTERNAL SWAGE TO FLARELESS, HYDRAULIC

AS8576 (Current)

6/10/2021

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, TEE, MALE FLARELESS TO EXTERNAL SWAGE ON RUN, EXTERNAL SWAGE ON BRANCH, HYDRAULIC

AS6485 (Current)

6/10/2021

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, ADAPTER, STRAIGHT, EXTERNAL SWAGE TO FLANGE SEALING, MALE FLARELESS, HYDRAULIC

AS6492 (Current)

5/26/2021

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, ELBOW 90°, BULKHEAD, EXTERNAL SWAGE TO FLARELESS, HYDRAULIC

AS6484 (Current)

5/11/2021

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

New Approach to Dielectric Barrier Discharge Plasma Actuator Materials for Active Flow Control Applications

129873/16/2021

Dielectric Barrier Discharge (DBD) plasma actuators are simple devices with great potential for active flow control applications due to their low cost, low weight, compatibility with aerodynamic surfaces, absence of moving parts, real-time control and fast response ability. A DBD plasma actuator is typically composed by two asymmetric electrodes (exposed and embedded) separated by a dielectric layer, which plays an essential role in the actuating performance. The most used material to produce the dielectric layer of DBD actuators is the commercial polyimide Kapton, due to its outstanding features for this application, such as dielectric strength, large withstanding temperature range, chemical and radiation resistance, among others. However, the pursue of even better performances has driven the scientific community for novel alternatives to this material and to explore the possibility of producing multifunctional dielectrics. In this sense, novel commercial polyimides such as Cirlex (high temperature resistance, dimensional stability, chemical resistance), fluorinated polymers PVDF � polyvinylidene fluoride (low density, remarkable electroactive properties) and Teflon � polytetrafluoroethylene (dielectric strength, flexibility, high strength), or reinforced thermosets (excellent mechanical properties, dimensional stability up to high temperature, easy to functionalize) are being evaluated for DBD plasma actuator applications. These materials were used to produce DBD plasma actuators and their performance in terms of power consumption, induced flow velocity, mechanical efficiency and thermal behavior was studied. Since some of them can be used as structural materials, the actuators can thus be an integral part of the structure instead of being attached to the surface, thus giving multifunctional character to the structure. Further, some of the aforementioned materials also present electroactive properties (piezo- and pyroelectricity), being therefore also suitable as self-sensing materials. These approach enables the fabrication of structures with self-flow control capabilities, without the integration of external devices that can affect the aerodynamics, and pave the way for the sensing of the structures taking advantage of the electroactive nature of the materials.

Nunes-Pereira, Jo�o

Fluoride Materials for Extra-Thin Computer Chips

TBMG-3782710/1/2020

Smaller and more compact is the direction in which computer chips are moving. Two-dimensional (2D) materials are considered to have great potential since they are as thin as a material can possibly be — in extreme cases, they consist of only one single layer of atoms. This makes it possible to produce novel electronic components with tiny dimensions, high speed, and optimal efficiency.

FITTING ASSEMBLY, ELBOW 90°, REDUCER AND NONREDUCER, INTERNAL FLARE TO FLARED TUBE

AS4407B (Historical)

6/11/2020

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, ADAPTER, STRAIGHT, EXTERNAL SWAGE TO FLANGE, FLARELESS

AS6483 (Current)

4/28/2020

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

Performance of Vehicle Fuel System Elastomers and Plastics with Test Fuels Representing Gasoline Blended with 10% Ethanol (E10) and 16% Isobutanol (iBu16)

04-13-02-0008

4/24/2020

The compatibilities of fuel system elastomers and plastics were evaluated for test fuels containing 16 vol.% isobutanol (iBu16) and 10 vol.% ethanol (E10). Elastomers included two fluorocarbons, four acrylonitrile butadiene rubbers (NBRs), and one type of fluorosilicone, neoprene, and epichlorohydrin/ethylene oxide. Plastic materials included four nylon grades, three polyamides, polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), ethylene tetrafluoroethylene (ETFE), polyphenylene sulfide (PPS), high-density polyethylene (HDPE), polybutylene terephthalate (PBT), polyoxymethylene (POM), flexible polyvinylchloride (PVC), polyetherimide (PEI), polyetheretherketone (PEEK), and a phenol formaldehyde reinforced with glass fiber (GFPF). For each polymer material, the volume, mass, and hardness were measured before and after drying. Dynamic mechanical analysis (DMA) measurements were also performed on the dried specimens. For the elastomer materials the measured properties were similar for both fuels. The fluorocarbons and fluorosilicone swelled the least (~20%), while more moderate (20-45%) expansion occurred for the two NBR hose grades and (ECO). HNBR, neoprene, and silicone exhibited high swelling and softening, which likely precludes their use in many fuel systems. For the plastic materials, the observed swell was low; Nylon 11 swelled around 15%, but otherwise, their measured swell was <10%. Many of the plastics also showed sensitivity to alcohol type, as the E10 test fuel often imparted appreciably higher swell than iBu16. In general, the plastic materials showed good compatibility with the iBu16 and E10 test fuels. The sole exception was the PVC material, which was structurally degraded from exposure to either fuel type. Compositional analysis showed high fuel retention in Nylon 12 and PVC. PVC also experienced a significant reduction in plasticizer compounds following exposure, which resulted in embrittlement and an increase in the glass-to-rubber transition temperature.

Kass, Michael, Janke, Christopher, Connatser, Raynella M., Lewis, Samuel, Baustian, James, Wolf, Les, Koch, Wolf

SHIELD TERMINATION, SOLDER STYLE, INSULATED, HEAT-SHRINKABLE, ENVIRONMENT RESISTANT WITH PREINSTALLED BRAID, NI PLATED, CLASS 1, ROHS

AS83519/5A (Historical)

10/25/2019

AE-8C2 Terminating Devices and Tooling Committee

FITTING, PLUG, TUBE END, FLARED

AS5168B (Historical)

9/3/2019

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

Device Simplifies Measurement of Fluoride Contamination in Water

TBMG-351499/1/2019

Adding fluoride to water has been common practice in a number of countries including the U.S. In low concentrations (below 1.5 mg/L), fluoride can help prevent tooth decay and strengthen bones; however, at higher levels, it can have the opposite effect, causing serious dental and bone disease, especially in children and developing fetuses. To determine whether drinking water is safe, fluoride must be detected in water at a parts-per-million (ppm) level. Measuring fluoride at such low concentrations with sufficient accuracy is expensive and requires a well-equipped chemical lab.

NUT, COUPLING

AS4326A (Current)

4/11/2019

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

NUT, RETAINED, FOR FLARED TUBE FITTINGS

AS4323A (Current)

3/26/2019

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING ASSEMBLY, TEE, REDUCER AND NONREDUCER, INTERNAL FLARE ON SIDE TO FLARED TUBE

AS4411B (Historical)

2/6/2019

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING ASSEMBLY, TEE, REDUCER AND NONREDUCER, INTERNAL FLARE ON RUN, TO FLARED TUBE

AS4410B (Historical)

2/6/2019

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, ADAPTER, PORT, REDUCER

AS5172D (Historical)

1/3/2019

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, ELBOW, 90 DEGREE, STANDARD AND REDUCER, BULKHEAD, FLARELESS, PRECISION TYPE

AS6048B (Historical)

10/1/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, ADAPTER, PORT, REDUCER

AS5172C (Historical)

8/14/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, UNION, BULKHEAD, EXTERNAL SWAGE, HYDRAULIC

AS6472 (Current)

8/3/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

Crystal-Free Formation of Non-Oxide Optical Fiber

TBMG-324788/1/2018

Researchers at NASA's Marshall Space Flight Center have devised a method for the creation of crystal-free non-oxide optical fiber preforms. Non-oxide fiber optics are extensively used in infrared transmitting applications such as communication systems, chemical sensors, and laser fiber guides for cutting, welding, and medical surgery. Some of these glasses, however, are very susceptible to crystallization. Even small crystals can lead to light scatter and a high attenuation coefficient, limiting their usefulness. NASA has developed a new method of nonoxide fiber formation that uses axial magnetic fields to suppress crystallization. The resulting non-oxide fibers are crystal-free and have lower signal attenuation rates than silica-based optical fibers.

FITTING, 37° SPHERICAL FLARED, CONNECTOR, MULTIPLE FLUID PRESSURE LINE, 45°

AS6094A (Historical)

7/16/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, 37° SPHERICAL FLARED, CONNECTOR, MULTIPLE FLUID PRESSURE LINE, 90°

AS6093A (Historical)

4/28/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, ADAPTER, UNION, FLARELESS TO BOSS

AS931D (Historical)

4/19/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, TEE, STANDARD AND REDUCER, BULKHEAD ON RUN, INTERNAL ON SIDE, FLARED, 37° SPHERICAL

AS6098A (Historical)

4/18/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, TEE, STANDARD AND REDUCER, BULKHEAD ON SIDE, FLARED, 37° SPHERICAL

AS6102A (Historical)

4/18/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, ELBOW 45°, STANDARD AND REDUCER, 37° SPHERICAL, FLARED

AS6104A (Historical)

4/18/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, CROSS, STANDARD AND REDUCER, 37° SPHERICAL, FLARED

AS6103A (Historical)

4/18/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, ELBOW, 90°, STANDARD AND REDUCER, FLARED, 37° SPHERICAL

AS6099A (Historical)

4/18/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, TEE, STANDARD AND REDUCER, 37° SPHERICAL, FLARED

AS6105A (Historical)

4/5/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, 37° SPHERICAL FLARED, CONNECTOR, MULTIPLE FLUID PRESSURE LINE, 75°

AS6092A (Historical)

4/5/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, BOLT, FLARED, 37° SPHERICAL

AS6075A (Historical)

4/5/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

FITTING, 37° SPHERICAL FLARED, CONNECTOR, MULTIPLE FLUID PRESSURE LINE, TEE

AS6095A (Historical)

4/5/2018

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies

Compatibility Assessment of Fuel System Thermoplastics with Bio-Blendstock Fuel Candidates Using Hansen Solubility Analysis

04-11-01-0004

3/1/2018

The compatibility of key fuel system infrastructure plastics with 39 bio-blendstock fuel candidates was examined using Hansen solubility analysis. Fuel types included multiple alcohols, esters, ethers, ketones, alkenes and one alkane. These compounds were evaluated as neat molecules and as blends with the gasoline surrogate, dodecane, and a mix of dodecane and 10% ethanol (E10D). The plastics included polyphenylene sulfide (PPS), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyoxymethylene (POM), polybutylene terephthalate (PBT), polypropylene (PP), high density polyethylene (HDPE), along with several nylon grades. These materials have been rigorously studied with other fuel types, and their volume change results were found to correspond well with their predicted solubility levels. The compatibility was assessed using Hansen solubility parameters and in many instances peak solubility occurred for blends rather than the neat fuel components. The results showed that good compatibilities can be expected for PPS, PVDF, PET, nylons, acetal, PEI, PVC, HDPE and PBT. PTFE showed potential incompatibilities at low blend concentrations, especially when E10D was used as the base fuel blend. Although, the nylons show good overall compatibility, the results do indicate that mid-range and high alcohol contents may not be suitable for Nylon 6 and Nylon 11 in applications requiring low volume swell. Poor potential compatibility was limited to two plastic types; PETG exposed to mid and high blend levels of the ethers and PP exposed to sabinene and the aromatics. In general, the data showed good compatibility for the majority of the candidate fuels and plastics.

Kass, Michael, West, Brian H.