3M™ Diamond Microfinishing Film Roll 675L

High-quality Materials for Microfinishing
3M™ Diamond Microfinishing Film Roll 675L securely anchors micron-graded diamonds to a polyester film backing. Known for its strength and resilience, the polyester film backing makes it tough so that it can withstand heavy-duty finishing. The rolls are also color coded by grade to help you reduce the risk of selecting the wrong grade.

Waterproof Backing
Polyester film backings are also water resistant, so the abrasive may be run with a wet lubricant, which helps wash away unwanted swarf and debris and keeps the abrasive running cool. When used in roll form for a process like superfinishing, our 675L roll enables slow abrasive feed rates and requires fewer steps, because of its durability, which in turn can reduce costs.

Achieving the Desired Roughness Average
Many microfinished products require a specific Ra, or roughness average. To obtain the desired Ra when applying thermal spray coatings, we recommend following a unique sequence of steps tailored to the substrate. It is important for operators to consider these factors — Ra and substrate — when selecting the grade of film for this belt.

Overall, this micron-graded diamond abrasive delivers the desired finish without compromising the integrity of the substrate. Its strength and versatility make it a suitable abrasive for your finishing needs.

<strong class="MMM--txt_bold" "="">Superfinishing with 3M™ Diamond Microfinishing Film 675L

Sequential Surface Finishes Obtained (Ra Micro Inch)
Roll Material		74μ	45μ	30μ	20μ
Tungsten Carbide	Ra	12-16	8-12	5-8	2.5-5
Chrome Carbide	Ra	15-20	10-14	6-10	4-6
Nickel Based	Ra	20-55	14-19	6-10	4-6
Chrome Oxide	Ra	-55	-45	—	—
Operating Conditions	Recommended	Acceptable Range
Workpiece Speed	300 sfpm	150-350
Traverse Rate	0.07 inch/rev	0.03-0.1
Abrasive Support	65 Shore A Roller	—
Abrasive Speed	0.5-1.0 inch/min	—
Pressure	20 lbs/inch width	10-40
Oscillation	Alternating Moderate/None
Coolant	Water with 4-8% synthetic coolant