July 14, 2022

How to define the surface finish for injection molded parts

blog injection molding

Some companies have troubles to define what their product surface should be, or how to describe precisely what exactly they want to the injection mold supplier, mostly they will just say matt or polish, actually this is not clear enough to define the product surface, there are many standards for the polish or matt, and some unique patterns we call it texture.

Here is an overview of SPI-SPE standard for polishing surface

SPI Description Ra
in µm
(DIN)
Definition
A-1 Diamond
buff grade 3
0
– 0.025
For
mirror or optical finishes. Most time consuming. Steel grade important to
results
A-2 Diamond
buff grade 6
0.025
– 0.05
A-3 Diamond
buff grade 15
0.05
– 0.076
B-1 600
grit paper
0.05
– 0.076
Removes
all tool and machining marks. Provides good mold release. Light reflecting
finish on molded part, some sheen.
B-2 400
grit paper
0.10
– 0.127
B-3 320
grit paper
0.23
– 0.25
C-1 600
stone
0.25
– 0.30
Remove all tool and machining marks. Provides good
mold release. Mute finish on molded part, no sheen.
C-2 400
stone
0.64
– 0.71
C-3 320
stone
0.97
– 1.07
D-1 Dry
blast glass bead 11, 200 distance at 0.7 Mpa; 5 sec
0.25
– 0.30
For
decorative finishes. Often used for die-cast and thermoset cooling. Helps
hide shrink marks and other imperfections. Dull, non reflecting finish on
molded or cast part.
D-2 Dry
blast 240 oxyde, 125 distance at 0.7 Mpa; 5 sec
0.66
– 0.81
D-3 Dry
blast 240 oxyde, 150 distance at 0.7 Mpa; 5 sec
4.83
– 5.84

Here is VDI standard for matt surface, Matt surface is created by erosion process, it is a light and even textured surface.
VDI standard for matt surface

It can be also unique patterns, there are many standards, mostly popular and widely recognized are MOLD-TECH and YS
YS-texture spec

Knowing these standards, you are able to communicate professionally with your injection mold supplier, like ACO Mold.

Related Blogs

blog aco mold
Kickoff meeting for mold making project
For each mold making project, it's necessary to hold a kick off meeting before start. All the project members involved and customer have an opportunity to discuss face to face....
blog injection molding
Building injection mold in China and saving 30%
I started building injection molds in China, Taiwan, HongKong, and Portugal back in the late 70's. This was when I lived and worked in the US and the molds were...

Table of Contents

Tell us your request right now and contact us today about getting started on your next project together!

Email:
sales@acomold.com

Or Fill Out The Contact Form Below:

Support Your Business with Better Molding Solution

Contact Info
Copyright © 2023, ACO Mold. Terms of Service and Privacy Policy. All rights reserved.  Powered by ACO MOLD.
1 1.png

Join Our Network

Please email to sales@acomold.com
or fill out the contact form below: