Carcinogenic Potential of Quartz Powder

Carcinogenic Potential of Quartz Powder

2022-11-09 10:56:03  News

Quartz Powder is widely used for countertops and slabs. Quartz Powder is used extensively in construction. This article will examine the characteristics of quartz powder and its relationship to other materials, including hydrated cement and steel fibres-based ECC. This article will also address the potential carcinogenicity of quartz powder.

X-ray diffraction pattern of SF and QP

The coherent interference of scattered light X-rays hitting a sample such as crystals creates X-ray diffraction patterns. This nondestructive analytical technique provides information about the structure, chemical composition, as well as physical properties of a material. The intensity of the X-ray beam hitting the sample determines the diffraction patterns. The incident angle, wavelength, and polarization all affect the beam's intensity.

A thin film is exposed under X-ray light to measure the intensity of diffraction. If the diffraction pattern is not flat, the curvature will affect the sample. In this case, the diffraction pattern is corrected using the Fraser correction.

X-ray diffraction is a nondestructive technique that can determine crystal structures and phase identities. The powder's diffraction pattern provides information about its crystal structure, phase identity, preferred crystal orientation, and other structural parameters. The peaks in X-ray diffraction patterns are produced by constructive interference between X-rays. These peaks are dependent on the distribution of atoms within a lattice. An X-ray diffraction pattern can identify periodic atomic arrangements within a material.

The reconstructed image is shown in Fig. 4. This image shows excellent resolution. It is 94 nm higher than the resolution of comparable microscopes. Excellent consistency is also evident in the reconstructed image concerning the SEM image. Although the right hand was absent from the original image, the reconstruction shows it is still present.

X-ray diffraction is a technique that uses the constructive interference of monochromatic and crystalline X-rays. The X-rays are generated by a cathode ray tube and collimated to focus them. The incident rays are then directed towards the sample and diffracted. Bragg's Law states that incident rays can produce diffracted rays if certain conditions are met. Once the diffracted rays have been detected, they are processed.

A combination of diffraction peaks is obtained for each mineral, which is further divided into d-spacings. Each mineral has a unique d-spacing. The peaks are then compared to the reference patterns in an orderly manner. The International Centre for Diffraction data has a database of d-spacings for hundreds of thousands of inorganic compounds.

X-ray diffraction patterns of SF to hydrated concrete

X-ray Diffraction reveals the complex process of cement hydration. This pattern allows us to determine the crystalline phases in the cement as it undergoes hydration. The diffraction pattern also provides information on the development of porosity and amorphous content. This technique can be combined with computed microtomography to investigate the process. We used two pastes filled with different sizes of capillaries, and we analyzed them after 50-days of hydration.

These results showed that silica fume replacement for Portland cement hurts the cement's microstructural properties. The cement was subject to silica fume replacement in Portland cement at 5%, 10% and 15%, respectively. X-ray Diffraction was used to measure the changes in its microstructure. The cement's calcium hydroxide content was lower, and the AFM/CSH ratio decreased.

Another study was done to determine the role of calcium carbonate within cementitious pastes. XRD has been extensively used to investigate the phases of cement, and the XRD analysis of this sample was used to characterize the composition of the hydrated cement. It was found that the paste cured had two distinct calcium carbonate polymorphs. These polymorphs contribute to the matrix filling.

It is a matter of great debate whether types of cement contain enough amorphous material. Suherman and colleagues recently published a study. Showed that the amorphous content of the cement was between six and fifteen per cent. It is recommended that a standard external method, called the G factor, be used to measure the amorphous content of types of cement.

The Rietveld refinement is another important method to determine the proportion of the amorphous phase. This refines the strain for all phases of a mixture. This improves the agreement between measured and calculated data. However, it should not be used in all cases. This method can yield the wrong strain value.

The crystallinity of a substance affects its ability to hydrate the cement. In the case of zeolite and quartzite, their crystallinity indexes differ. Thus, this information is useful in predicting the hydration kinetics of cement mixtures.

X-ray diffraction pattern of SF to steel fibres-based ECC

The X-ray diffraction pattern for SF to steel fibres-based EMC reveals a distinctive chemical and physical structure. ECC specimens can degrade up to 89% at temperatures above 1200oC. ECC becomes more fragile and loses its residual properties and shape at high temperatures.

The addition of slag to steel fibres-based ECC results in a slight increase in tensile strength but decreased ductility. The partial slag replacement by fly ash reduced flexibility, although this effect was small.

The blending matrix and interface are two critical factors that influence the mechanical properties of ECC. In addition to the chemical composition of these composites, the presence of coarse aggregates in the mix can alter the tensile behaviour of the ECC. The replacement of binding material and the role of fibres are also significant.

Using X-ray diffraction, you can calculate the fracture strength of SF-to-steel fibres-based ECCS. The crack width at the maximum fibre bridge strength (or crack opening) is an important parameter to characterise fibre-bridging properties. The crack width will pull the fibres from the matrix if it exceeds this limit. Therefore, all cracks in an ECC composite matrix should be smaller than the crack opening at the maximum fibre bridge strength.

A dense matrix and high-modulus fibres have been used to produce ultra-high-performance concrete. This blend of fibres is low in porosity so that reinforcement won't rust. This is especially important for construction.

The X-ray diffraction patterns for SF-to-steel fibres-based ECF were very similar to those of steel fibres. The mixtures were tested for direct tensile and three-point bending strength, flexural strength, and mineralogical composition.

The paper also describes a plasticity-based damage mechanics model for ECC. This model is different from others because it incorporates fibre and matrix descriptions.

Quartz powder can cause cancer.

Quartz is one of the most prevalent minerals in the earth's crust. However, it can also be a human carcinogen. Silicosis can be a serious lung disease and may lead to lung cancer if inhaled for long periods. The International Agency for Research on Cancer has designated quartz probable human carcinogen based on numerous clinical and laboratory studies. This classification means that OSHA must label quartz-containing products as probable human carcinogens.

Quartz particles' crystallinity, surface features, and other characteristics have been linked to various diseases, such as lung cancer, silicosis and autoimmune disorders. The chemical composition and crystallinity of quartz powders used in particle toxicology studies also affect their toxicity. Quartz specks of dust are made by grinding quartz rocks containing natural rock. This alters the crystallinity and creates particles with an irregular surface.

Although many geologists know the risk of quartz dust, they don't understand human lungs and lung tissue well. As a result, most geologists have only linked quartz inhalation to silicosis. In addition, the medical community struggles to understand the terminology used in geology. For example, during the early stages of asbestos research, doctors did not differentiate the different types of asbestos. Mineral nomenclature is another issue that the regulatory community has to deal with.

In this study, freshly fractured quartz was more able to generate carbon-centred free radicals than ground mineral quartz. This effect was observed for up to 60 minutes after exposure to the samples. These are encouraging results, but it is important to be cautious when using quartz dust. These findings could help us determine if quartz is a carcinogen in humans.

Numerous studies have been done on the cytotoxicity and reactivity of quartz powder. A 1997 monograph examined the literature on CS genotoxicity. Many groups have looked at the literature about quartz since then. Some studies have shown that quartz can cause cancer. This evidence should be taken with caution.

The International Agency for Research on Cancer (IARC) reviewed silica's potential carcinogenicity and classified the substance as a human carcinogen in Group 1. These studies were based on epidemiologic studies that had low confounding factors. Overall, most of these studies showed increased lung cancer risks. Some studies also showed an increase in risk with increased exposure.


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