NEMA
National Electrical Manufactures Association
NEMA LI-1 is the most widely used standard for thermoset composites in sheet, tube, and rod forms in the United States.
NEMA LI-1 “Industrial Laminated Thermosetting Products” was revised in 1999 to mirror MIL-I-24768 with the intention of replacing this Military Specification.
The NEMA Standard provides generic category recognition of grades based on their construction, reinforcement, and resin. Typical properties for each category are defined and published along with standard dimensional tolerances for standard forms of the product. NEMA provides one of the most basic standards for thermoset materials and is often enhanced with customer specific specifications or additional criteria from another standard.
Sheet Grades
| Grade Type | Description | Norplex-Micarta Grades |
|---|---|---|
| Fr-4 | epoxy glass flame retardant |
NP130 NP130HF NP510A |
| Fr-5 | epoxy glass flame retardant high temperature |
MC511FR |
| G-3 | phenolic glass | NP504 NP515LS |
| G-5 | melamine glass | NP509 |
| G-7 (see note) | silicone glass | MC507U |
| G-9 | melamine glass | NP509 |
| G-10 | epoxy glass | NP500A |
| G-11 | epoxy glass high temprature |
NP572 MC511AF MC511A NP511 NP511EM |
| C | phenolic canvas | NP310 NP310HT NP342 |
| CE | phenolic canvas electrical grade |
NP310E |
| CF | phenolic canvas electrical post forming grade |
NP318 |
| L | phenolic linen | NP320 |
| LE | phenolic linen electrical grade |
NP320E MC320LE |
| X | phenolic paper | NP610 |
| XP | phenolic paper punching grade |
NP611 NP611R NP660 |
| XPC | phenolic paper cold punching grade |
NP612 NP625 NP664 |
| XX | phenolic paper | NP629 |
| N-1 | phenolic nylon | NP101 |
MC507U does not meet all of the electrical properties of NEMA G-7. Contact us for assistance.
Convolute Wound Tube Grades
| Grade Type | Description | Norplex-Micarta Grades |
|---|---|---|
| Fr-4 | epoxy glass flame retardant |
RT130 RT130M RT130X |
| G-3 (see note) | phenolic glass | RT504 RT504F |
| G-5 | melamine glass | RT505 RT505F |
| G-7 | silicone glass | RT507 RT507F RT507L |
| G-9 | melamine glass | RT509 RT509F |
| G-10 | epoxy glass | RT500 RT500F RT500M RT500X RT520M RT520MH RT520X RT571 |
| G-10 High Temperature “G-11” (see note) |
epoxy glass high temperature |
RT511 RT511H RT511F RT511M |
| C | phenolic canvas | RT310 RT310H RT310S RT342 RT342H |
| LE | phenolic linen | RTB320 RTB320H RTB320S RTB320X RTB320Z |
| X | phenolic paper | RT610 |
| XX | phenolic paper | RT628 RT628H RT629 |
| XXX | phenolic paper | RT630 RT630H RT630S |
Although G-3 tubing grades are recognized by NEMA, ASTM and MIL-I-24768 standards as a material form, property requirements are undefined at this time.
NEMA Standard LI-1 and MIL-I-24768 do not recognize a high temperature epoxy glass convolute rolled tube form, but, these materials are manufactured with a high temperature epoxy resin system, commonly used for NEMA G-11 and MIL-I-24768/27, type GEB sheet products, and do have improved thermal properties at elevated temperatures.
Rolled and Molded Rods
| Grade Type | Description | Norplex-Micarta Grades |
|---|---|---|
| Fr-4 | epoxy glass flame retardant |
RM130 |
| G-3 (see note) | phenolic glass | RM504 |
| G-5 | melamine glass | RM505 |
| G-10 | epoxy glass | RM500A |
| G-10 High Temperature “G-11” (see note) |
epoxy glass high temperature |
RM511A |
| C | phenolic canvas | RM310 |
| L | phenolic linen | RM320 RM320H |
| LE | phenolic linen electrical grade |
RM320LE |
| XX | phenolic paper | RM629 |
| XXX | phenolic paper | RM630 |
Although G-3 tubing grades are recognized by NEMA, ASTM and MIL-I-24768 standards as a material form, property requirements are undefined at this time.
NEMA Standard LI-1 and MIL-I-24768 do not recognize a high temperature epoxy glass convolute rolled tube form, but, these materials are manufactured with a high temperature epoxy resin system, commonly used for NEMA G-11 and MIL-I-24768/27, type GEB sheet products, and do have improved thermal properties at elevated temperatures.