3M 9100FX Parts FAQs
Cover kits, protection plates, neck protectors, batteries and magnifying lenses for a premium auto-darkening welding helmet, and how to choose the right ones.
What is the difference between outer and inner protection plates, and why are they sold in packs?
The outer plate faces the arc and takes most of the spatter. The inner plate sits on the wearer's side and protects the inside of the filter. Both are thin consumables that protect the filter behind them, so they are supplied in packs and are meant to be changed often.
Make sure the plate is shaped for your filter and helmet. Some are made as clear or scratch-resistant types, so check the packaging or manual to confirm which fits your setup.
Do I need to buy parts made for my exact helmet?
Yes, as far as you can. The HSE advises using the correct replacement parts and following the manufacturer's replacement schedule for PPE. Parts made for a different helmet may not fit, may leave gaps, or may not match the protection the helmet was tested with.
Find the helmet or filter type on its markings and in the manual, then match the part against the manual's parts list. If you are not sure, check before ordering, and do not modify parts to make them fit.
What does an ear and throat protector do?
It is a flame-resistant cover that extends protection over the ears, throat and neck, where spatter and arc radiation can reach skin the helmet shell leaves exposed. A welding shield should screen the entire face, ears and portions of the neck from direct arc radiation.
It works with your clothing, not instead of it. Clothing still needs to cover all other skin that could be exposed. Check it for burns and thin patches, and replace it if damaged.
Can a neck protector replace a collar or welding jacket?
No. It adds to your other protective clothing. Clothing must cover all parts of the body that could be exposed to arc radiation, including neck and chest, using heavy-duty, dark, opaque fabric, and man-made fibres which can melt should be avoided.
The protector closes a gap around the ears and throat, but your jacket, gloves and collar still matter. Your risk assessment and the maker's instructions decide exactly what you need for the work you do.