Josephine E Tondo et al Copyrights@2016 ISSN 2231-4490 International Journal of Plant, Animal and Environmental Sciences Page: xx Available online at www.ijpaes.com Volume-6, Issue-3 July-Sep 2016 Coden: IJPAJX-CAS-USA, Copyrights@2016 ISSN-2231-4490 Received: 3 rd May-2016 Revised: 20 th May-2016 Accepted: 26 th May-2016 Review article FORMALDEHYDE FIXATION BLOCKS AS A MITIGATING TOOL OF WASTE DISPOSAL Reynaldo O, Baarde PE and Josephine E Tondo * Technological University of the Philippines and Philippine Normal University, Manila, Philippines * Corresponding author E-mail address: tondo.je@pnu.edu.ph INTRODUCTION Science laboratories, investigations and activities serve as one of the significant requirements for learners who are taking up Science subjects particularly in the field of Biology. Experiments such as taxidermy and specimen preservation are the common activities where in formalin are being use. Formaldehyde is an organic compound used as disinfectant, biocide, tissue fixative and embalming agent, drug testing, photography and other important usage in industries. Formaldehyde is predominantly use in agriculture, concrete and plaster additives, cosmetics, disinfectants, photography and wood preservation. This organic compound is tagged by US National Toxicology in 2011 as the human carcinogen. ABSTRACT: This study focused on the product development of fixation blocks as mitigating waste disposal of formaldehyde. With the objectives of producing a proper waste disposal and alleviate the amount of formaldehyde used in Science laboratories and other scientific experiments, the researchers used cement as a stabilizer with different measurement together with the calcium containing materials such as calcium hydroxide, calcium carbonate and plaster of paris. Tests for compression and flexure were done to select the best product among the mixtures used in the study. Findings revealed that the best mixture for formaldehyde fixation block is the 25% calcium hydroxide, 75% cement and 40% formaldehyde. Based from the test of formaldehyde leachate using Colorimetric-Nash Method with reference of Japanese International Standard, for exposed and non-exposed fixation blocks, 8.84 mg/L (ppm) for exposed set-up and 7.38 mg/L (ppm). The range of formaldehyde leachate is moderate level only and within the range of 5 to 20 mg/L(ppm). Furthermore, test of formaldehyde leachate identified the calcium hydroxide is the best binder of formaldehyde among the given components of mixtures used in the study. With this, formaldehyde fixation block is considered as the best mitigating tool for hazardous waste disposal such as formaldehyde. Keywords: Compression; Flexure; Formaldehyde; Leachate