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Synair Polyurethane 



Por-A-Mold 2040


Applications tst
Por-A-Mold 2040 (PAM 2040) is used to make molds of detailed masters that contain shallow undercuts. Some of the most common uses of PAM 2040 are concrete formliners and to make molds for point-of-purchase displays, rapid prototypes, special effects, taxidermy, and sculpture reproductions.

Por-A-Mold 2040 is a two-part polyurethane molding system. Por-A-Mold 2040 is mixed one-to-one by and cures at room temperature. PAM 2040 cures to a medium hardness (Shore A44 ±2), light to medium amber rubber.


Instructions for Use

Prepare Master and Mold Housing
First, clean and dry your master thoroughly. If the master has a porous surface (clay, concrete, plaster, etc.) or is made of sulfur-based clay, you must seal it. You can use polyurethane varnish, polyurethane sealant, or paste wax to seal your master. Next, anchor your master and seal the base so that PAM 2040 does not leak under your master. A hot glue gun works to anchor and seal the base at the same time. Also, you should seal all of your mold housing connections with sulfur-free clay or hot glue. Then, apply an appropriate release agent (we recommend Synlube 531) to the master and interior of the mold housing. Apply release agent sparingly, while coating all surfaces of the master. Too much release agent may cover the details of the master. You should allow the release agent to dry approximately 10 minutes before you pour your mold.

Measure Curative and Prepolymer
Note: Por-A-Mold 2040 provides approximately 15 minutes for you to mix and pour the mold before it begins to gel.

Make sure that curative and prepolymer are room temperature before mixing them. Please note that in cold weather it may take up to 24 hours for the curative and prepolymer to reach room temperature. Using two clean, dry, plastic containers of equal size, measure equal amounts of the curative (part A) and the prepolymer (part B).

Mix Curative and Prepolymer
After you prepare the master and mold housing and measure the curative and prepolymer, you are ready to pour the curative and prepolymer into another clean, dry, plastic container. Scrape the curative and prepolymer containers to move all of the material into the mixing container. Combine the two ingredients for several minutes until no color striations are visible. Be sure to scrape the sides and bottom of the mixing container while combining the two ingredients. You must mix the curative and prepolymer completely so that PAM 2040 will cure correctly. If air bubbles form during mixing, you should degas the mixture to remove them.

Pour Mold
To ensure that no air bubbles form over the details of your master, you can brush a thin base coat onto the master and then pour the rest of the 2040. The best way to pour a mold is to tilt your mold slightly and pour into one spot at the corner of the mold, allowing the material to cover your master slowly like the flow of lava. When you have finished pouring the mold, you may lightly spray release agent on the top of PAM 2040 to break any air bubbles that have risen.

Demoldand Cure Mold
Once you have poured your mold, allow the mold to cure 16 hours before demolding. To prolong the life of the mold, allow it to cure for 3–4 days before using it.


Curative (Part A) and Prepolymer (Part B)

The following table lists the properties of the curative and prepolymer of Por-A-Mold 2040 before they have been mixed.


Curative (Part A)

Prepolymer(Part B)




Mix Ratio by Weight



Mix Ratio by Volume



Shelf Life

6 Months

6 Months

Specific Gravity @ 75°F (24°C)



Viscosity @ 75°F (24°C), CPS




Mixed Curative (Part A) and Prepolymer (Part B)

The following is a list of the properties of Por-A-Mold 2040 after the curative and prepolymer have been mixed.




Mix Time*

1-2 Minutes

75°F (24°C)

Pot Life

15 Minutes

75°F (24°C)

Gel Time*

21-22 Minutes

75°F (24°C)

Cure Time*

24 Hours

75°F (24°C)

Demold Time*

16 Hours

75°F (24°C)

*Mix time, pot life, gel time, cure time, and demold time vary depending on mass and component temperature.


Cured Por-A-Mold 2040

The following table explains the properties of Por-A-Mold 2040 after it has cured.


Cured Product


Light to Medium Amber

Elongation, %


Modulus, PSI, 100%






Rebound, Bashore, %


Reversion Temperature

270°F (132°C)

Shore Hardness

A44 ±2

Specific Gravity


Tear, Die C, PLI


Tear, Split, PLI


Ultimate Tensile, PSI



Storage and Handling

Keep the Por-A-Mold 2040 container tightly closed when not in use and store at temperatures between 60–90° F (16–32° C). Do not expose the curative or prepolymer to moisture! If moisture contaminates PAM 2040, it will not cure. If these storage requirements are met, Por-A-Mold 2040 carries a shelf life warranty of six months.

Be sure to read the Material Safety Data Sheet that comes with Por-A-Mold 2040. When working with PAM 2040, please observe the following safety precautions.

  • Use only in well-ventilated areas.
  • Wear chemically resistant rubber gloves, safety glasses, and an apron.
  • Avoid prolonged or repeated contact with skin.
  • In case of skin contact, wipe affected area with isopropyl alcohol, followed by soap and water.
  • In case of eye contact, flush eyes with water for 15 minutes and consult a physician.
  • If swallowed or comes into contact with eyes, seek medical attention immediately.


Por-A-Mold 2040 Product Bulletin

The conditions for your use and application of our products, technical assistance and information (whether verbal, written or by way of production evaluations), including any suggested formulations and recommendations, are beyond our control. Therefore, it is imperative that you test our products, technical assistance and information to determine to your own satisfaction whether they are suitable for your intended uses and applications. This application-specific analysis at least must include testing to determine suitability from a technical as well as health, safety, and environmental standpoint. Such testing has not necessarily been done by Synair Corporation. All information is given without warranty or guarantee. It is expressly understood and agreed that customer assumes and hereby expressly releases Synair from all liability, in tort, contract or otherwise, incurred in connection with the use of our products, technical assistance and information. Any statement or recommendation not contained herein is unauthorized and shall not bind Synair. Nothing herein shall be construed as a recommendation to use any product in conflict with patents covering any material or its use. No license is implied or in fact granted under the claims of any patent.

March 10, 2000, Updated July 17, 2001