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If leakage, cracking, explosion and other accidents occurred, it will easily lead to major casualties and property damage, affecting public safety and social stability.
So, the safety of CNG cylinders has become a key factor affecting the healthy development of CNG cars.
As we know, the quality of materials, including mechanical properties, physical properties, chemical propertie, is directly related to the life and safety of components, devices or articles.
Tensile properties.
Mechanical properties of the two Cr-Mo steels Fig 2 Mechanical properties of the two Cr-Mo steels (a) Rockwell hardness (b) Tensile properties Fig.2 displays the mechanical properties of the two Cr-Mo steels.

Thickness and bottle diameter influence of the mechanical properties of PET beer bottles are obtained.
This article is to analyze the thickness of the PET beer bottles and bottle outside diameter of its mechanical properties.
It first analyzes thickness and bottle diameter of the mechanical properties of PET beer bottles.
Conclusion Through the structural analysis of PET beer bottle, that affect the bottle resistance to internal pressure strength of the main structural factors are the thickness of the bottle and the bottle diameter.
The mechanical properties and body diameter of PET beer bottle effects got analyzed.

Mechanical properties of the porous titanium were investigated using a compressive test.
So in the present work, a simple chemical treatment was applied to porous titanium, and the structure changes were observed and the mechanical properties were studied.
According to their model, the single most important factor affecting the mechanical properties is the relative density, and the relationships between the plateau stress, elastic modulus and relative density are given by (1) (2) where E is the elastic modulus of the porous solid, Es is the elastic modulus of the dense matrix material, σpl is the plateau stress of the porous solid and σys is the yield strength of the dense matrix material.
A regression analysis of the mechanical properties of porous titanium was performed and revealed that the relationship between the mechanical properties and the relative densities of the as-sintered porous titanium conforms to the model when C3 equals 0.816 , n1 equals 3.835, C4 equals 2.382 , n2 equals 4.199 (as shown in Fig. 5).
Therefore, the mechanical properties can be predicted by this mode and desired mechanical properties can be obtained by adjusting the relative density of porous titanium.

For each provenance, 30 samples were selected for the performance test of mechanical properties.
In other word，Indian provenance 3071 was the best one on mechanical properties of all geographical provenances.
Relationships of Teak Properties.
Among them the positive correlation between basic density and fiber percentage were pronounced while vessel percentage was the predominant negative factor affecting the basic density.
All in all, the basic density was identified as the fundamental base of various mechanical properties of teak, determining other mechanical properties.

Studied properties are presented by means of water vapour diffusion coefficient, water vapour diffusion resistance factor and absorption coefficient respectively.
The natural pozzolana, namely natural zeolite (NZ), is used as supplementary cementitious material which affects the durability properties of the end product.
Many degrading factors are connected with the permeability of the material [1,2].
Water vapour transport properties.
Černý, High performance concrete containing lower slag amount: A complex view of mechanical and durability properties, Construction and Building Materials 29(6) (2009) 2237-2245

The physical and mechanical properties along with their workability of concrete produced with RCA and ultra-fine fly ash were investigated.
In addition to environmental protection, conservation of natural resources, shortage of land for waste disposal, and increasing costs of waste treatment prior to disposal are the principal factors driving the recycling concept [1].
Different content ultra-fine fly ash is used to improve workability and mechanical properties of recycled concrete.
Furthermore, these mechanical properties are even improved at 28 days.
[5] I.B.Topcu: Physical and mechanical properties of concrete produced with waste concret, Cement and Concrete Research, 27(12)(1997), pp. 1817-1823

The mechanical properties of rolled billets were determined: ultimate tensile strength σU, offset yield strength σ0.2 and elongation δ50.
In this case, There is mechanical and electrical wear, local overheating, vibration and adverse environmental factors To increase the speed of railway transport, there is a need to increase the tension of the contact wire in order to ensure the stability of the contact pressing of the current collectors of the rolling stock.
The mechanical properties were determined on a Zwick Roell tensile testing machine at a test speed of 2 mm/min.
This corresponds to well-known ideas about the cold rolling effect on the level of metal mechanical properties [14-18].
The nature of the change in the mechanical properties level of CuSn0.2, CuSn0.4, and CuSn0.6 alloys is similar to the nature of the change in the properties of copper.

The purpose of this study is to investigate on mechanical properties of binderless boards from kenaf fiber.
Kenaf has been actively cultivated in previous years at some of the country like Indonesia, Philippine and Vietnam due to several factors.
As a reference, MDF board from commercial was test for to evaluate its mechanical properties.
Summary In short, it can be concluded that mechanical properties of binderless boards from kenaf fiber will affected by the pressure and temperature applied during fabrication process.
This will increased the mechanical properties of binderless board from kenaf fiber.

Properties of garnet is strongly affected by crystal structure and microstructure.
This study aimed to study the microwave loss in nanosized particles GdIG synthesized using the mechanical alloying technique in order to discover on how the microstructure would affect the microwave properties.
Pores and grain boundaries are non-magnetic inclusion that might affect the magnetic and microwave properties that will be discussed later.
The microstructure of GdIG also plays an important role that affect the microwave property.
Grain boundaries, non-magnetic inclusions and inhomogeneous regions are the other factors inclusive [12].

Modeling the Hardness and Mechanical Properties of Moulded Natural Rubber Pad Bryan B.
Nine ingredients of the rubber pad were chosen as factors and varied at two levels of proportions.
Through compounding, a rubber processor or manufacturer enhances the physical and mechanical properties of raw gum elastomer.
Regression coefficients of derived models for hardness and mechanical properties of moulded natural rubber pad.
Regression coefficients of derived models for hardness and mechanical properties of moulded natural rubber pad.