Products Description

High purity flake graphite is a high-end graphite product selected from natural flake graphite ore and deeply purified and processed. It is a functional non-metallic material with high carbon content and excellent physical and chemical properties.

Typical technical specifications and parameter ranges

Characteristic	Typical scope (industrial grade high purity products)	Top range (4N+)	explain
Fixed carbon content (FC%)	≥ 99.9%	≥ 99.95%, ≥ 99.99%	Core indicators
Ash (%)	≤ 0.1%	≤ 0.05%, < 0.01%	The lower the better
Volatile components (V.M.%)	≤ 0.2% - 0.5%	≤ 0.2%	Affected by process
Moisture (Moisture%)	≤ 0.3% - 0.5%	≤ 0.3%	It may rise slightly after storage
Sheet diameter (count/size)	+150 mesh+100µm- +50 mesh	+80 mesh+180µm- +50 mesh	Large flakes are of high value and can be produced into fine flakes as required
PH price	~ 7 (neutral) or slightly higher/lower	~ 7	Related to post-processing
Main impurity elements (ppm)	Fe: dozens to hundreds, S: ≤ hundreds <1000	Strictly control the total amount and each element	Special requirements for specific applications (e.g. LiB, nuclear use)
Surface	Grayish to dark black scaly powder	-

Core Features

1. Ultra-high purity

(1) This is the most core feature. The fixed carbon content of high-purity flake graphite is usually ≥ 99.9%, high-end products can reach ≥ 99.95%, ≥ 99.99%, or even higher.

(2) Ultra-low ash content: corresponding to high purity is extremely low impurity content, usually ≤ 0.1%, top-grade ash content can be <0.01%.

(3) Fewer and specific impurity types: the main residual impurity elements may include trace amounts of Fe, S, Si, Al, Ca, etc., which need to be strictly controlled to meet the requirements of high-end applications.

2. Unique scale-like crystal structure

(1) It retains the perfect layered crystal structure of natural scale graphite, which resembles a small sheet or scale. This structure determines its excellent physical properties.

(2) The advantage of large flakes: The value of large flakes is often in retaining a larger sheet diameter size (usually>150 mesh / 100µm, or even larger such as +80 mesh, +50 mesh). Large flakes have more advantages in the construction of conductive network, lubrication and preparation of graphene by expansion.

(3) Classification: According to the size of the chip (usually measured by mesh or mm), it can be divided into large scale, medium scale, fine scale and high purity graphite to meet different application requirements.

3. Excellent physical and chemical properties

(1) Excellent electrical conductivity: The electrical conductivity of copper is about 4 times that of copper, and the high electrical conductivity makes it very suitable for fields that require conductive fillers.

(2) Excellent thermal conductivity: the thermal conductivity of the layer is excellent, and it is a good thermal conductive material.

(3) High lubricity (low friction coefficient): its layered structure makes the graphite layer easy to slide, providing efficient lubrication.

(4) High temperature resistance: can be long-term resistant to high temperature above 3000°C under oxygen-free conditions, is an ideal refractory and high temperature material.

(5) Corrosion resistance: has excellent chemical stability to most acids, alkalis and organic solvents.

(6) Plasticity/coating: soft texture, easy to combine with other materials, can be processed into coatings, grease, film and other forms.

(7) Low thermal expansion coefficient: small deformation at high temperature and good dimensional stability.

(8) Antioxidation: although lower than high purity artificial graphite, but good stability in the relatively low temperature and non-oxidizing medium environment.

Classification criteria

By purity: C> 99.9% (3N), C> 99.95% (3N5), C> 99.99% (4N), C> 99.995% (4N5), C> 99.999% (5N) and so on.
By diameter (screening): formulated according to different standards or requirements, such as +50 mesh, +80 mesh, +100 mesh, +150 mesh, -325 mesh, etc.
According to the final application index, for example, it is specially used for high purity graphite for lithium anode materials and high purity graphite for nuclear reactors.