The phrase "a material which is" is correct and usable in written English.
It can be used when describing the characteristics or properties of a specific material in a technical or scientific context.
Example: "The study focused on a material which is known for its high thermal conductivity."
Alternatives: "a substance that is" or "a material that is".
In this study, several material tests are conducted on a material which is Parker Labs AquaFlex Ultrasound Gel Pad.
It is because this technology uses the polymer PLA (Polyactic acid) as a material, which is biodegradable, and saves fuel and reduces waste when fabricating prototypes.
Ultra-High Performance Fibre Reinforced Concrete is a material which is becoming increasingly popular in structural applications, mainly due to its superior mechanical characteristics.
The flaw models a break of an intervoid ligament in a material which is subjected to a far-field tensile loading.
This study is one of the first to report on the use of Hilbert–Huang transform (HHT) to determine the modulus of elasticity of a material, which is one of the most important properties of metals.
Compression experiments are not able to quantify the ductility of a material, which is defined as the ability to deform under tensile stress, so pillar bending experiments were used to measure plastic strain-to-failure (see Supplementary Methods for detailed experimental techniques).
The corners and arches are done in rich, creamy terra cotta, a material which was then entering wide use.
In this computer-generated image, a cylinder (green circle) is coated with 200 layers of such a material, which was found to be the optimal design.
In 1987, Karl Müller and Johannes Bednorz discovered the first high temperature superconductor, a material which was superconducting at temperatures as high as 50 Kelvin.
Vanadium dioxide is an example of a thermochromic material which is a promising candidate for this kind of application as proposed by Granqvist [1].
Polymeric carbon nitride (C3N4) is a semiconductor material which is a very promising green photocatalyst with good physico-chemical properties and stability.
