Hardener PH3663 is the standard production hardener for fabricating composite parts. PH3663 has a 90 minute working time which provides more time for construction. This hardener provides similar mixed viscosities, so handling will be basically the same, except for the different working times.
This product can be considered low toxicity material that has minimum hazard potential when used properly and in a clean and responsible manner. Hardener PH3663 does not contain methylene dianiline (MDA), or other potentially harmful aniline derivatives. Neither the resin nor the hardeners will crystallize in normal shipping and storage conditions, including refrigerated storage. All components have excellent moisture resistance, for minimal problems in high humidity environments.
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.