Getting Started With Rubmps
Rubmps The Revolutionary Rubber Material Thats Changing Industry Standards has been showing up in fabrication shops more frequently over the last couple of years. It is a thermoplastic elastomer blend with a high cross-linking density that gives it a Shore A hardness range between 60 and 95 depending on the grade you select. The material can be injection molded, extruded, or compression formed. It resists oils, UV exposure, and moderate chemical contact without swelling or degrading. That combination is why automotive seal makers, conveyor belt manufacturers, and industrial gasket fabricators have started switching to it from traditional EPDM and nitrile compounds.
How the Material Actually Processes
The processing window is narrower than most people expect. Rubmps The Revolutionary Rubber Material Thats Changing Industry Standards needs a barrel temperature between 190 and 220 degrees Celsius during injection molding. If you push past 225, the material starts to degrade and you get flash on the part edges plus a noticeable drop in tensile strength. Cooling time matters more than most operators account for. You need at least 40 seconds in the mold for anything over 6 millimeters thick or the internal stress will cause warping after demolding. I ran into this directly when I was making seals for a high-pressure hydraulic line. The first batch looked fine on the outside but failed a burst test at 80 bar. Once I extended the cooling cycle and reduced the injection speed by about thirty percent, the same parts passed consistently at 150 bar. The fix was not exotic. It was just the material needing slower plasticization and a longer hold phase to let the crystalline regions set properly.
Design Considerations You Should Know
Wall thickness variation is the most common failure source. If you go from a 2-millimeter section to a 10-millimeter section in the same part, the thicker area cools slower and shrinks differently. That creates sink marks and internal tension lines. Keep wall transitions gradual with a radius ratio above three to one. Draft angles of at least 1 degree on vertical surfaces help ejection. Anything less and you will see drag marks on the finish side of the part. Undercuts are possible but they require a side-action mold or a collapsible core, which increases tooling cost significantly. From my own shop experience, I designed a custom O-ring groove profile for a compressor housing and initially specified a square profile. The material would not pop out cleanly and the corners were getting cut during extraction. Switching to a rounded undercut profile with a 0.5-millimeter radius eliminated the tearing. I learned that the material has a relatively low tear propagation resistance compared to standard nitrile, so sharp edges in your design become real problems.
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Post-Processing and Finishing
Trimming is straightforward with a hydraulic press trim or a rotary trimmer. Do not use a manual guillotine blade on parts thinner than 2 millimeters because the material tends to peel rather than shear cleanly. A heated blade setup at around 120 degrees gives a cleaner cut. Surface finishing is usually not required for most applications, but if you need a smooth contact face for a dynamic seal, I recommend a light abrasive media tumbling pass using fine silica grit for 15 minutes. That removes parting line residue without changing the dimensional tolerances. Plasma treatment works well if you need improved adhesion for bonding or painting later. The treatment typically increases surface energy from about 38 dynes per centimeter to roughly 52 dynes per centimeter, which makes silicone adhesives and acrylic primers stick much better than they would on a raw surface.
Pitfalls and Where the Material Falls Apart
Rubmps The Revolutionary Rubber Material Thats Changing Industry Standards is not a universal replacement. It has poor performance in concentrated aromatic hydrocarbons like benzene and toluene. Prolonged immersion causes significant volume swell, sometimes over 40 percent in 72 hours depending on the grade. It is also not ideal for continuous high-temperature service above 130 degrees Celsius. The material begins to oxidize and harden at those levels, losing about 20 percent of its elongation after 500 hours of exposure. For extreme heat applications, silicone or fluoroelastomer compounds remain the better choice. Another limitation is the initial material cost. Rubmps runs roughly 30 to 40 percent more per kilogram than standard nitrile rubber, though the longer part life often offsets that over a full production run. If your part is a low-stress static seal used in a clean environment, spending extra for this material is unnecessary. Stick with what already works and only upgrade when you need the specific properties it actually delivers.
Practical Tips for Smaller Shops
Buy test bars first before committing to a full production order. Most suppliers will send a small sample kit at low cost. Run a tensile test and an oil immersion test on the sample with the exact fluid your application will encounter. Document the results. This takes about two days and saves you from a bad material purchase that costs thousands in wasted tooling time. Keep your regrind ratio below 15 percent when recycling scrap material. Adding too much regrind affects flow characteristics and reduces final part strength noticeably. I tested a 30 percent regrind mix and the burst pressure dropped by about 18 percent compared to virgin material, which was enough to fail our quality spec. If you must reuse scrap, sieve it first and blend it carefully rather than throwing it back into the hopper without measurement. Sourcing is straightforward. Major industrial compound suppliers carry Rubmps grades now. Look for material data sheets that include ISO 37 tensile test results, ASTM D2000 classification codes, and a shrinkage rate specification for the specific batch you are ordering. Reputable suppliers will provide all of that without you having to ask.
