There are 6 steps to choose right concrete saw blade 

1. Considering performance and cost before starting to choose
Decide which is most important to you: the initial price of the blade or the cost per cut.

For smaller jobs or occasional use, a low priced blade may be preferable.

For larger jobs or regular use, a higher priced blade will actually be less expensive to use because it will deliver the lowest cost per cut.

For really big jobs, the lowest possible sawing cost (cost per foot) is usually much more important than the initial price. 

ChinShine has a grading system to help you identify the different performance levels of blades. He offers diamond blades at various quality and cost levels, ranging from basic economy to top quality or professional uses. Generally the key difference among these options is the diamond content, which is the greatest raw material cost in manufacturing the blade. Moving up from a standard to a premium blade may boost the cost 20% or more, but you'll get a higher concentration of diamonds and significantly longer blade life.
2. Correctly identify what you’re cutting, how does the concrete blade work? 

Correctly identifying the material you are going to cut is the most important factor in choosing a blade. Understanding how a diamond blade works will help you choose a blade with the right characteristics and cutting quality for your needs. 
For maximum cutting speed and blade life, you should match the concrete blade as closely as possible to the material you're cutting. Characteristics of the concrete you need to know include the compressive strength, the size and hardness of the aggregate, and the type of sand.

ChinShine considers concrete with a compressive strength of 3000 psi or lower a soft material and concrete with a strength above 6000 psi a hard material. Therefore, you should use a concrete saw blade with a hard bond to cut the lower-strength concrete and a blade with a soft bond to cut high-psi concrete. Similarly, hard aggregate (such as trap rock, basalt, and quartz) dulls diamond particles quickly, so use a blade with a softer bond to allow new diamonds to be exposed as needed.

The size of the aggregate in concrete primarily affects saw blade performance. When cutting through larger aggregate (3/4 inch and up), the blade cuts and wears more slowly. Pea gravel (smaller than 3/8 inch) is easier to cut, but the blade will wear faster.

What if you will be cutting more than one type of concrete? As a general rule, we recommend choosing the blade based on the material you'll be working with most often or the material for which top blade performance is most important. Most diamond blades can cut a range of materials.

The type of sand determines the abrasiveness of concrete, with sharp sand being the most abrasive and round sand the least. To determine the sharpness of the sand, you need to know where it's from. Crushed or river bank sand is usually sharp while river sand is round and nonabrasive. The more abrasive the sand, the harder the bond requirement.

It directly affects the cutting speed and the life of the blade. You will find diamond blade recommendations charts throughout the catalog to help you locate the proper blade for your job.  For maximum performance (cutting speed and life), the material should be matched to the blade as closely as possible. As a rule, determine the material which will be cut most often, or the material for which top concrete blade performance is most important.
3. Cutting Concrete at the Right Time 
If you're placing new concrete, you have the option of cutting control joints while the concrete is still green or the next day after the concrete has hardened. The timing of the cut will dictate the type of blade you select.
Some decorative concrete contractors prefer to cut concrete while it's still green because it minimizes the occurrence of ugly random cracking (especially in warm weather, when concrete hydrates faster) and permits shallower joint depths of an inch or less. However, green concrete will be softer and more abrasive than the same concrete in a cured state. That's because the sand in the mixture hasn't yet bonded to the mortar and it acts as an abrasive. Diamond Blade manufacturers offer hard-bonded diamond blades specifically for cutting green concrete.

4. Wet or dry cutting?
Choosing wet or dry may be a matter of user preference or job requirement. When using a power hand tool such as a power hand saw, it is not safe to use water because of the electrical power source. However for concrete saws, wet cutting is usually preferred because you can cut deeper when using water as a coolant. For tile and masonry saws, either wet or dry cutting blades can be used. For power cutters, dry blades are more popular, but they are often used wet to control dust.  

The main difference between wet and dry blades is the weld (as described in Step 1). Dry-cutting blades have segment welds that resist heat and don't require water for cooling. They are usually intended for intermittent cutting and for use on handheld, low-horsepower saws. If you're sawing decorative pattern lines in concrete, dry-cutting blades are often the best choice for making crisp, clean cuts. These decorative cuts are typically only 1/16 to 1/4 inch deep and do not function as control joints.

Wet-cutting blades are typically used with walk-behind saws for cutting joints in cured concrete flatwork because water cooling permits deeper cuts. Although it's possible to use most dry-cutting blades with water, never use a wet-cutting blade dry. Always continuously cool the blade with water to avoid segment loss and blade warpage. 
Wet blades MUST be used with water. Dry blades may be used EITHER dry OR wet, as the job or equipment allows.
5. The Segment Height of blade decide the cost
Total segment heights may be misleading because of non- diamond bearing segment bases necessary for the laser welding or brazing process. That is why ChinShine shows you exactly how much of each segment has diamonds and can actually be used to cut.
Diamond blade segment height by itself is not a true measure of a blade segment height by itself is not a true measure of a blade’s value. Many other factors affect a blade’s performance and consequent value. Consider the diamond size, concentration and quality, the hardness of the bond, the cutting power (torque) of the saw, and how well the blade specification is matched to the material being cut.

6. Concrete Blades Compatibility with Saw-cutting Equipment 

What types of handheld saw or flat saw are you using? What is the horsepower and operating speed (or rpm)? Blade manufacturers provide charts with recommended operating speeds and maximum safe operating speeds for their diamond blades. You'll also find this information stamped right on the blade itself.
Always match the concrete blade with the speed range of the saw. Operating the blade at a lower speed than recommended can diminish its cutting life and performance. Exceeding the blade's maximum rpm rating can damage the blade and risk injury to the saw operator.
Other factors to consider:
Concrete saw blades designed for wet use only must be operated by saws that can deliver a continuous supply of water to cool the blade. 
Most blades for cutting green concrete are designed for use with special searly-entry saws that minimize joint raveling and spalling. 
Don't use a concrete saw blade that exceeds the maximum blade diameter and cutting depth capacity of the saw. ChinShine Concrete Blades to be used on power cutters have to be rated at higher rpms. All ChinShine high-speed cut-off blades are rated at the appropriate, higher rpms.
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