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Franklin Fibre-Lamitex Corporation
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Moisture Absorption Effects on Industrial Laminates

Water or moisture absorption is important in determining the value of industrial laminates as a control of the uniformity of the product, affects the mechanical, electrical and chemical properties of the laminate and has a bearing on a laminate’s appearance and dimensional stability.

Water absorption is tested according to ASTM D 570-57T. A 1” x 3” x thickness test specimen is immersed in water 24 hours @ 23°C. It is weighed before, after the test period and the water absorption rate recorded as a percent of the sample’s original weight.
This method of recording water absorption can lead to false interpretations. Various laminate formulations of different specific gravities will differ in weight and actually represent a considerable difference in percentage increase by weight. An absorption of 1 gram for a test specimen of Lamitex G5 glass melamine weighing 100 grams would be recorded as 1% absorption. A same size test specimen of Lamitex CE weighing 66.5 grams and absorbing the same amount by weight of water, 1 gram, would be reported as a 1.5%.
There are a number of water absorption factors that should be considered. While water absorption measurement is based on 24 hours immersion at 23°C, none of the laminates become fully saturated in that time. Saturation may require immersion for as long as 6 months. Also, the thicker the test specimen, the less water is absorbed in 24 hours as a % by weight and raising the water temperature will increase the rate of absorption but not the quantity of water absorbed.
The thicker the wall of a tube or the larger the diameter of a rod, the less water will be absorbed in 24 hours as a % by weight. Therefore, material dimensions and thickness greatly influence the rate of water absorption.
Low or the minimal moisture absorption rate for each laminate formulation, a key property in the material selection process, is accomplished with strict manufacturing process controls. Established resin content, volatile content and % of flow, times, pressures and process temperatures are audited for all laminate productions to ensure they meet published performance expectations.
Low water absorption rates are essential in mechanical applications to insure the lowest possible dimensional changes and least possible insulation degradation for electrical application in high humidity conditions.
Low moisture absorption is equally important to chemical resistance. Generally speaking, the lower the water absorption, the better chemical resistance to acids and alkalizes.
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In an effort to develop a more cost-effective #coolingduct  and barrier insulation for #transformers , Franklin has developed its special corrugated insulation. For more info please contact us or visit our web page at www.franklinfibre.com #transformerinsulation   #frp   #corrugated  
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Lamitex® PF-30 material is a jute-fibre based phenolic laminate with a graphite filler. This material is your superior option when choosing a material for a wear surface application. The jute fibres combined with a phenolic resin matrix make this product strong, and the graphite filler provides a natural self-lubricant for the material. #wearstrip   #wearpad   #Lamitex  
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The question “What is the difference between NEMA grade #G-10 (Mil-I-24768/2 Type GEE) and NEMA Grade #FR-4 (Mil-I-24768/27 Type GEE-F)?” has been raised many times. Although they are typically made from the same base material (E-Glass), the epoxy resin matrix used for binding each material is inherently different. For more information on #Lamitex  composites please visit out website at www.franklinfibre.com or give us a call at 1 (302) 652-3621.
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Lamitex® Glass Epoxy composite tubes and sheets, formulated to meet NEMA G10 (MIL-P-18177/ Mil-I-24768/2 type GEE) applications are a multipurpose thermoset material that is frequently specified for its mechanical strength and/ or electrical insulation. Its compressive strength (68,000 psi), temperature index (electrical =130C / mechanical =140C), arc resistance, and ability to keep these strengths in dry and humid conditions make it suitable for transformer, cryogenic, and load bearing applications among many others. This grade of material has excellent machining characteristics and can take on a greenish and/or black physiognomy. Some of the historical applications of G10 include printed circuit boards, arc chutes, and switchgear insulation. With our technical expertise and wherewithal from many years of being in this business, we are confident in our ability to work with engineers on their designs and produce exactly what they are looking for. Franklin Fibre Lamitex® glass epoxy G10 is manufactured in sheets, round tubes (convolute wound and/or filament wound), molded channel, angle, square and rectangular tubes, and custom fabricated parts.
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2015-05-21
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Lamitex® Glass Melamine composite tubes and sheet, formulated to meet NEMA G9 (MIL-P-15037 / Mil-I-24768/1 type GME) and NEMA G5 (MIL-P-15037 / Mil-I-24768/8 type GMG) applications are thermoset materials that are frequently specified for their high mechanical strengths, self-extinguishing properties and mostly for their exceptional arc resistance in humid and dry environments. Common applications for G9 and G5 include, but are not limited to; arc barriers, switch mounts, terminal boards, and other similar parts. With our technical proficiency and ability from many years of being in this business, we are confident in our ability to work with end users and engineers in machining this often difficult material to their specifications. Franklin Fibre Lamitex® glass melamine G9 and G5 are able to be manufactured in sheets, round tubes (convolute wound), molded channel, angle, square and rectangular tubes, and custom fabricated parts. 
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2015-05-29
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Paper #Phenolic  material has been used for electrical insulation since the early 20th century. The combination of the high-temperature resistant phenolic resin and a treated paper convolute wound tube or laminated sheet provides excellent strength, weather resistance and electrical resistance. This material has been used extensively through the years in various applications and parts in switch gear, transformers, tap changers, munitions, rockets, bushings, sleeves, coil forms, core tubes and casings. #Lamitex ® paper phenolic tubing has excellent electrical properties in high humidity conditions.
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Choose Lamitex® materials for your electrical insulation.  #electricalinsulation   #lamitex  
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Lamitex® Materials are your superior option in the #hotrollingmill  industry. #steel   #bearing   #arcfurnace     #insulation  
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A big THANK YOU goes out to all those who stopped by our booth last week at the WWETT 2016 show in Indianapolis. This was a step in the right direction on our quest to provide a superior rotor vane product to this industry at a fair price. For those who may have missed us - please visit our website for product datasheets and production videos. 
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