A buyer searching for Liquid Silicone is usually trying to stop a bad substitute. A resin, sheet, or rubber part is specified by the polymer, the grade, the form, and the properties the part must hold. The notes below are selection criteria for a Liquid Silicone. They are not a catalog promise. Confirm every rating on the current datasheet, drawing, or test report for the revision you will receive.
What has to be true of Liquid Silicone
A resin, sheet, or rubber part is specified by the polymer, the grade, the form, and the properties the part must hold. For a Liquid Silicone, start from the duty, then the interface to the rest of the machine or the room, then the document that proves the claim. A lower price that leaves one of those blank is a different product.
Liquid Silicone is easy to confuse with Injection Machine Plastic. If the quote could be read as either, add the line that separates them: the rating, the fitment, or the standard named below. Link the drawing number to that line so receiving inspection can reject the wrong one.
Numbers that change the quote
| Line | What to write for Liquid Silicone |
|---|---|
| Color and additive | Color, UV, or glass fill, if they matter. |
| Food or medical | Only with the file for that contact. Do not assume a natural color is approved. |
| Processing | For a molder, the datasheet. This page does not set a process window. |
| Polymer | Family and grade name or a datasheet. |
| Form | Pellet, sheet, tube, or a molded part. |
| Properties | The two or three numbers the design uses: strength, hardness, temperature, or flame. |
How to compare two offers
Lay both quotes for Liquid Silicone on one sheet and line up color and additive, food or medical, and processing. If a cell is empty, the offer is not finished. Ask for the missing line in writing. When those match, the honest difference is lead time, the test evidence, and who carries the warranty. Do not average a fully specified Liquid Silicone with a cheaper line that omitted color and additive.
Documents worth having before the deposit
Ask for the datasheet of the exact grade. The file should name Liquid Silicone and the revision, not only the supplier’s homepage. A factory quality certificate such as ISO 9001 can sit beside that file. It does not replace it.
Failures that show up after delivery
- Ignoring filler content.
- Claiming food contact without the grade’s file.
- Substituting a polymer because the abbreviation looks close.
On a Liquid Silicone, the expensive version of the first mistake is discovering it after the goods are in the crate. Put the rejection condition in the purchase order while the supplier can still restate the offer.
A worked RFQ line
Use this shape, then replace the brackets with your duty: “Liquid Silicone — State polymer, grade, form, and the properties the design uses.” That sentence is a template, not a rating of any brand. If a supplier’s datasheet uses different units, convert them onto this sheet so the next offer can be compared.
Where words like stainless / corrosion belong
Searches often add a constraint to Liquid Silicone: stainless / corrosion, or OEM / custom. Keep those on this page. Name the alloy or the coating and the chemical it must survive. Stainless is a family, not a guarantee. OEM or custom means a drawing, a revision, and a statement of who owns the tool. Without those, you are buying the catalog part. If you need a third constraint, add it as another line on the same drawing. A second URL that only swaps the adjective does not give a buyer a second fact.
Related in this section: how to specify Injection Machine Plastic.
Questions buyers actually ask
What should an RFQ for Liquid Silicone include?
State polymer, grade, form, and the properties the design uses.
Is a cheaper Liquid Silicone the same part?
Only if color and additive, food or medical, and the documents match. A missing line is a different offer.
Do waterproof, OEM, or IP words need their own page?
No. For Liquid Silicone they are extra lines on this specification. Ask for the test or the drawing that gives the word a value.