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"SPE / SPI Standards, and DME Mold Finish Kit"



Current question:

January 4, 2022

Q. Came across a drawing for a rubber part from the 1960s. The part is used where sealing compressed air is important. The part is 0.031" thick sheet and both flat sides have a finish callout which states "Cellophane finish". I have searched for what this might mean in term of a Ra value or Rt value.

Any thoughts or ideas what was meant by "cellophane finish"?

Rob Robertson
Engineer - Centennial, Colorado
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Closely related Q&A's, oldest first:

2001

Q. Where can I obtain a copy of 'SPI/SPE' Standards.

Rick F [last name deleted for privacy by Editor]
- McAllen, Texas
^


2003

Q. Where can I get the steel finish for SPE / SPI standards?

We need to know what a SPE / SPI #5 finish is. We have looked at DME [Ed. note: Detroit Mold Engineering] Mold Finish Kit, but it does not shows any # 5 finish. They only show A 1-3, B 1-3, C 1-3 & D 1-3 finishes

Leandro V [last name deleted for privacy by Editor]
plastics - Bensenville, Illinois
^


2003

Q. I too am looking for this info. I have Googled all over the place but cannot find this info. We have several drawings of parts that call out finishes like SPE #4 MINIMUM or SPE-SPI #5 MINIMUM. I have found the SPE-SPI A-1 through D-3 finishing spec, but not this other scale. Surely someone out there knows what it is? I have been to the Society of Plastics Engineers and the Society of the Plastics Industry, but no luck.

David G [last name deleted for privacy by Editor]
- Greenville, South Carolina
^


2003

A. THE OLD WAY TO DOCUMENT SPE-SPI FINISH WAS #1-#5. SPI HAS CHANGED THIS TO A1, A2 ETC.
SPI HAS A MOLDED PLAQUE WITH SAMPLES OF THESE NEW FINISHES AND A PAPER COMPARING THE OLD STANDARD WITH THE NEW.

L. ROCKWELL
- Phoenix, Arizona
^


thumbs up signThanks, L. The current place to get the "Mold Finish Guide" is at
http://store.plasticsindustry.org
Look for item AR-106.

I don't know the order number for the cross referencing paper for the old vs. new system, but it may be AR-101. Good luck.

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^

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Ed. note: Sorry that link has been broken for a while; we don't know if it's coming back.



2004

If there anybody who knows where can I download a free copy of the SPI-SPE surface finish standard for reference? Or anybody know what is meaning of "Gloss: SPI-SPE#2 finish" and "Matte: SPI-SPE#3 finish with liquid hone." Please help, thanks.

Thomas C [last name deleted for privacy by Editor]
OEM manufacturer - Hong Kong, China
^


Sorry, Thomas, these are copyrighted specs, and they are for sale, not available for free. Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^


2005

A. The listing correlates as follows:-
#1 = A-1
#2 = A-3
#3 = B-3
#4 = C-3
#5 = D-2
#6 = D-3
The info is on page N-112 of the current DME [Ed. note: Detroit Mold Engineering] catalog. There is also a chart with further info.

Edward [last name deleted for privacy by Editor]
- Australia
^


2006

Q. I want to buy SPI-SPE mold finishing guide, can I buy it anywhere in Hong Kong or China?

Janet Y [last name deleted for privacy by Editor]
- Hong Kong
^


June 8, 2009

Q. I am looking for guidance on texturing standards for injection molded parts that goes beyond the SPE/SPI AR-106 guidance which appears to just discuss polished and blasted finishes. I am looking for etched, cross-hatch, and other more "aesthetic" finishes.
I would like to reference, if possible, a better defined standard than an internally used description that individual metal finishers use in their sales literature.

Mike Johnson
product development - Maple Grove, Minnesota
^


September 30, 2009

A. SPI FINISH GUIDE
A-1 GRADE #3 DIAMOND BUFF
A-2 GRADE #6 DIAMOND BUFF
A-3 GRADE #15 DIAMOND BUFF
B-1 600 GRIT PAPER
B-2 400 GRIT PAPER
B-3 320 GRIT PAPER
C-1 600 STONE
C-2 400 STONE
C-3 320 STONE
D-1 DRY BLAST GLASS BEAD #11
D-2 DRY BLAST #240 OXIDE
D-3 DRY BLAST #24 OXIDE

SPI Finish A-1 -- Grade #3, 6000 Grit Diamond Buff
SPI Finish A-2 -- Grade #6, 3000 Grit Diamond Buff
SPI Finish A-3 -- Grade #15, 1200 Grit Diamond Buff
SPI Finish B-1 -- 600 Grit Paper
SPI Finish B-2 -- 400 Grit Paper
SPI Finish B-3 -- 320 Grit Paper
SPI Finish C-1 -- 600 Grit Paper
SPI Finish C-2 -- 400 Grit Paper
SPI Finish C-3 -- 320 Grit Paper
SPI Finish D-1 -- 600 Stone Prior to Dry Blast Glass Bead #11
SPI Finish D-2 -- 400 Stone Prior to Dry Blast #24 Oxide
SPI Finish D-3 -- 320 Stone Prior to Dry Blast #24 Oxide

SPE -- The Society of Plastic Engineers
SPI -- The Society of the Plastic Industry

John Wu
- Dongguan City ,Guangdong province, China
^




Q. I wonder if anyone knows were I might find a chart the compares SPI surface finish to a RMS or a Ra surface finish?

Jay C [last name deleted for privacy by Editor]
- Pittsfield, Massachusetts
^



February 5, 2015

Q. SPI also produced a "Cosmetic Specifications of Injection Molded Parts" (AQ-103) document with a Surface Identification and Classification scheme which closely parallels the Mold Finish Guide scheme, i.e., surfaces A through D and grades 1 through 4 -- but really speaks more about how a part should be inspected. This would seem to be confusing since they mean very different things. Does anyone have a nice way of distinguishing these callouts on a drawing?

Dave

Dave Willms
- Waterloo, Ontario, Canada
^



January 20, 2016

Q. I'm interested in a final appearance of a SPI C3 finish. With a a picture to show the part in question, it has a surface appearance and feel that is not smooth. The part is a 3D printed FDM part. Can someone email me a picture of the required or close to surface appearance of this call out?

David Torres
- Huntington Beach, California. United States
^

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