{"product_id":"ampreg-31-epoxy-wet-laminating-resin","title":"Ampreg 31","description":"\u003ch2\u003eAmpreg 31 Epoxy Wet Laminating System — Technical Details\u003c\/h2\u003e\n\u003cp\u003eAmpreg 31 is a low-toxicity epoxy laminating resin built for hand layup and vacuum bagging of large composite structures. Its viscosity is tuned to wet out fabric well while resisting drainage on vertical and overhead surfaces, making it a strong choice for tooling, marine hulls, and other big, complex layups. It cures to a tough, high-strength matrix at room temperature and reaches its full mechanical and thermal performance with a simple low-temperature postcure.\u003c\/p\u003e\n\u003ch3\u003eAt a Glance (Standard Hardener)\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMix ratio\u003c\/th\u003e\n\u003ctd\u003e100:26 by weight (100:30 by volume)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMixed density\u003c\/th\u003e\n\u003ctd\u003e1.08 g\/cm³\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePot life (150 g, 25°C)\u003c\/th\u003e\n\u003ctd\u003e1 hr–1 hr 10 min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVacuum bagging window\u003c\/th\u003e\n\u003ctd\u003e2 hr–2 hr 40 min after mixing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEarliest demold\u003c\/th\u003e\n\u003ctd\u003e5 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCure schedule\u003c\/th\u003e\n\u003ctd\u003eAmbient cure at 18°C minimum; full properties with 16 hrs at 50°C or 5 hrs at 70°C postcure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGlass transition temperature (Tg)\u003c\/th\u003e\n\u003ctd\u003e59°C ambient cure; up to 91°C postcured\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTensile strength (cured resin)\u003c\/th\u003e\n\u003ctd\u003e47.6 MPa ambient; up to 78.0 MPa postcured\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFlexural strength (cured resin)\u003c\/th\u003e\n\u003ctd\u003e92.5 N\/mm² ambient; up to 126.4 N\/mm² postcured\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShelf life\u003c\/th\u003e\n\u003ctd\u003e36 months when stored at 10–25°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eChoose Your Working Time\u003c\/h3\u003e\n\u003cp\u003eAmpreg 31 ships with three Ampreg 3X hardener speeds, so you can match pot life to the size and complexity of the layup:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eHardener speed\u003c\/th\u003e\n\u003cth\u003ePot life (150 g, 25°C)\u003c\/th\u003e\n\u003cth\u003eBest for\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFast\u003c\/td\u003e\n\u003ctd\u003e25–35 min\u003c\/td\u003e\n\u003ctd\u003eSmall parts, thin layups, and quick turnaround\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e1 hr–1 hr 10 min\u003c\/td\u003e\n\u003ctd\u003eGeneral-purpose hand layup\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlow\u003c\/td\u003e\n\u003ctd\u003e3 hr 20 min–3 hr 40 min\u003c\/td\u003e\n\u003ctd\u003eLarger layups requiring more working time\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eSpecialty Extra-Slow and Ultra-Slow and High Tg hardeners are also available for extended open time and elevated-temperature service, respectively. Contact us for details.\u003c\/p\u003e\n\u003ch3\u003eCertifications and Sustainability\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLloyd's Register and DNV certified\u003c\/li\u003e\n\u003cli\u003eContains 6–32% BIO-sourced carbon content as standard\u003c\/li\u003e\n\u003cli\u003eFormulated with low-toxicity hardeners and Gurit Light Reflective Technology (LRT), which fluoresces under UV light to help identify and clean up uncured resin contamination\u003c\/li\u003e\n\u003cli\u003eTested at up to 90% relative humidity with no significant loss in interlaminar shear strength (ILSS)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eWhat is Ampreg 31 used for?\u003c\/h4\u003e\n\u003cp\u003eAmpreg 31 is used for hand layup and vacuum bagging of large fiberglass and carbon composite structures, including boat hulls, tooling and plugs, and other parts where good fabric wet-out and drainage resistance on vertical surfaces are important.\u003c\/p\u003e\n\u003ch4\u003eWhat is the mix ratio for Ampreg 31?\u003c\/h4\u003e\n\u003cp\u003eAmpreg 31 resin and Ampreg 3X hardener mix at 100:26 by weight (100:30 by volume) across the Fast, Standard, Slow, and Extra-Slow hardener speeds.\u003c\/p\u003e\n\u003ch4\u003eHow long does Ampreg 31 take to cure?\u003c\/h4\u003e\n\u003cp\u003eWith Standard hardener, pot life is about 1 hour and the laminate can be demolded in as little as 5 hours at room temperature. Full mechanical and thermal properties develop after a postcure of either 16 hours at 50°C or 5 hours at 70°C.\u003c\/p\u003e\n\u003ch4\u003eIs Ampreg 31 low-VOC or low toxicity?\u003c\/h4\u003e\n\u003cp\u003eAmpreg 31 uses Gurit's low-toxicity Ampreg 3X hardener range, selected to improve health and safety compared with older-generation hardeners. Standard epoxy PPE, including nitrile gloves, eye protection, and adequate ventilation, is still required. See the full Safety Data Sheet before use.\u003c\/p\u003e\n\u003ch4\u003eWhat is the difference between Ampreg 31 and Ampreg 30?\u003c\/h4\u003e\n\u003cp\u003eBoth are low-toxicity Gurit epoxy laminating systems with the same 100:26 mix ratio and hardener speed lineup. Ampreg 30 has a lower initial mixed viscosity, making it easier to wet out heavyweight reinforcements. Ampreg 31 is viscosity-optimized to balance good wet-out with drainage resistance, making it better suited to vertical and overhead surfaces.\u003c\/p\u003e","brand":"Gurit","offers":[{"title":"Ampreg 31 resin- Quart","offer_id":50653353640173,"sku":"AMP31-A","price":25.49,"currency_code":"USD","in_stock":true},{"title":"Ampreg 31 resin- Gallon","offer_id":50653369794797,"sku":"AMP31-B","price":95.4,"currency_code":"USD","in_stock":true},{"title":"Ampreg 3X Fast Hardener- 1\/2 pint","offer_id":50653375725805,"sku":"AP3XF-A","price":5.31,"currency_code":"USD","in_stock":true},{"title":"Ampreg 3X Standard Hardener- 1\/2 pint","offer_id":50653379166445,"sku":"AP3XR-A","price":4.86,"currency_code":"USD","in_stock":true},{"title":"Ampreg 3X Slow Hardener- 1\/2 pint","offer_id":50653384835309,"sku":"AP3XS-A","price":4.64,"currency_code":"USD","in_stock":true},{"title":"Ampreg 3X Fast Hardener- quart","offer_id":50653410263277,"sku":"AP3XF-B","price":21.23,"currency_code":"USD","in_stock":true},{"title":"Ampreg 3X Standard Hardener- quart","offer_id":50653412360429,"sku":"AP3XR-B","price":19.42,"currency_code":"USD","in_stock":true},{"title":"Ampreg 3X Slow Hardener- quart","offer_id":50653414818029,"sku":"AP3XS-B","price":18.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0690\/7415\/7805\/files\/AMP31-A-Ampreg-Epoxy-Laminating-System.png?v=1789058519","url":"https:\/\/www.fibreglast.com\/products\/ampreg-31-epoxy-wet-laminating-resin","provider":"Fibre Glast","version":"1.0","type":"link"}