Formlabs Resin Washing Solution is a proprietary composition that is non-flammable and has a high saturation like TPM. Where Formlabs Resin Washing solution differs from TPM is in washing performance. TPM tends to leave parts with an oily surface. Our internal testing and beta users found Resin Washing Solution to provide much better wash quality – on par with IPA. You can refer to the SDS for more info.