What Are Silicone Grommets?
Loose cables can chafe, leak, or short. Sharp panel edges can cut insulation in weeks. I have seen small grommets prevent big failures. Silicone grommets are flexible silicone rubber rings or bushings that protect wires, tubes, and small parts as they pass through holes, and they can also seal against dust, splash, and vibration. They […]
What Rubber Is Used in the Automotive Industry?
A wrong rubber choice can turn a good design into leaks, noise, or early cracks. I have seen small material mistakes cause big warranty problems. I do not like surprises in the field. Automotive rubber is usually EPDM, NBR, HNBR, FKM, silicone, CR, and PU, and each one matches a specific risk such as heat, […]
Which Rubber Compounds Are Compatible With Injection Molding?
Many buyers treat injection molding as a universal answer. That shortcut often causes scorch, bubbles, scrap, and unstable dimensions when the compound was never built for this process. Most thermoset rubbers can be injection molded if the compound has stable flow, enough scorch safety, and cure behavior that matches mold temperature and cycle time. EPDM, […]
When to Use Injection Molding for Rubber Parts?
Many rubber parts fail because the process choice was made too fast. I often see high scrap, unstable dimensions, and late rework when the wrong mold method is forced. I use rubber injection molding when I need repeatable output at medium-to-high volume, better fill of complex features, lower labor per part, and tighter control of […]
When Is Compression Molding Preferable to Injection Molding for Rubber?
I often see buyers pick a molding process too early. I see late design changes, higher scrap, and missed lead times when the process does not match the rubber part. Compression molding is preferable when I need lower tooling cost, better control for high-durometer or specialty compounds, simpler tooling changes, and stable results for medium […]
How to specify tolerances and surface finish for molded rubber parts?
Many rubber parts look “OK” in the first sample. Then the next batch shifts, the flash grows, and assembly starts leaking. I have seen this waste weeks. You should specify molded rubber tolerances by using a recognized tolerance standard, marking critical dimensions, defining inspection method and conditioning, and adding a clear surface finish and visual […]
What Are the Criteria for Selecting Rubber Materials?
Bad rubber choices look fine on day one. Then the seal swells, the gasket hardens, or the wheel cracks. I have seen projects lose weeks because one line on a material spec was missing. I select rubber materials by checking service temperature, media exposure, mechanical load, hardness and compression set, certification needs, and the real […]
What Happens to Elastomers at Low Temperatures?
Cold weather does not “pause” rubber problems. Cold weather often creates new ones. Seals leak. Hoses stiffen. Assemblies crack during installation. At low temperatures, elastomers get stiffer, their elastic recovery drops, and some compounds approach a glassy state. Seals can lose contact stress, dynamic parts can increase friction, and brittle cracking can occur if the […]
Which Elastomer Is Best for Oil Resistant Seals?
Oil leaks are small at first. Then the equipment gets dirty. Then the seal swells or hardens. Then the downtime bill arrives. For most oil-resistant seals, I start with NBR for general mineral oils, HNBR for oil + higher heat and longer life, and FKM (Viton®) for hot oils, fuels, and aggressive fluids. The “best” […]
Is Silicone Rubber Chemically Resistant?
Many buyers hear “silicone is resistant,” then the seal swells, softens, or starts leaking. The mistake usually comes from one missing detail: the exact chemical and the temperature. Silicone rubber has good chemical resistance to water, many dilute acids and bases, and many polar fluids, and it has excellent resistance to ozone and weather. Silicone […]
